{"id":1536,"date":"2026-04-10T15:30:09","date_gmt":"2026-04-10T07:30:09","guid":{"rendered":"https:\/\/mayaharper.showcasingme.net\/vn\/timing-diagrams-firmware-timeline-guide\/"},"modified":"2026-04-10T15:30:09","modified_gmt":"2026-04-10T07:30:09","slug":"timing-diagrams-firmware-timeline-guide","status":"publish","type":"post","link":"https:\/\/mayaharper.showcasingme.net\/vn\/timing-diagrams-firmware-timeline-guide\/","title":{"rendered":"S\u01a1 \u0111\u1ed3 th\u1eddi gian: Ph\u01b0\u01a1ng ph\u00e1p t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 l\u1eadp b\u1ea3n \u0111\u1ed3 d\u00f2ng th\u1eddi gian ph\u1ea7n m\u1ec1m c\u1ee7a b\u1ea1n"},"content":{"rendered":"<p>Ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m nh\u00fang t\u1ed3n t\u1ea1i \u1edf giao \u0111i\u1ec3m gi\u1eefa logic tr\u1eebu t\u01b0\u1ee3ng v\u00e0 th\u1ef1c t\u1ea1i v\u1eadt l\u00fd. Trong khi m\u00e3 ngu\u1ed3n ch\u1ea1y theo tr\u00ecnh t\u1ef1 logic, ph\u1ea7n c\u1ee9ng ph\u1ea3n \u1ee9ng v\u1edbi m\u1ee9c \u0111i\u1ec7n \u00e1p, chu k\u1ef3 \u0111\u1ed3ng h\u1ed3 v\u00e0 \u0111\u1ed9 tr\u1ec5 lan truy\u1ec1n. Kh\u00f4ng c\u00f3 m\u1ed9t bi\u1ec3u di\u1ec5n tr\u1ef1c quan r\u00f5 r\u00e0ng v\u1ec1 c\u00e1c t\u01b0\u01a1ng t\u00e1c n\u00e0y, ngay c\u1ea3 m\u00e3 ngu\u1ed3n m\u1ea1nh m\u1ebd nh\u1ea5t c\u0169ng c\u00f3 th\u1ec3 th\u1ea5t b\u1ea1i trong vi\u1ec7c giao ti\u1ebfp hi\u1ec7u qu\u1ea3 v\u1edbi c\u00e1c thi\u1ebft b\u1ecb ngo\u1ea1i vi, c\u1ea3m bi\u1ebfn ho\u1eb7c h\u1ec7 th\u1ed1ng b\u00ean ngo\u00e0i. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fac s\u01a1 \u0111\u1ed3 th\u1eddi gian tr\u1edf th\u00e0nh m\u1ed9t t\u00e0i li\u1ec7u thi\u1ebft y\u1ebfu. N\u00f3 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t h\u1ee3p \u0111\u1ed3ng gi\u1eefa logic ph\u1ea7n m\u1ec1m v\u00e0 c\u00e1c t\u00edn hi\u1ec7u \u0111i\u1ec7n v\u1eadt l\u00fd, \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u1ea5y m\u1eabu \u0111\u00fang c\u00e1ch v\u00e0 c\u00e1c l\u1ec7nh \u0111\u01b0\u1ee3c ph\u00e1t ra trong c\u00e1c kho\u1ea3ng th\u1eddi gian y\u00eau c\u1ea7u.<\/p>\n<p>M\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng t\u1ed1t s\u1ebd lo\u1ea1i b\u1ecf s\u1ef1 m\u01a1 h\u1ed3. N\u00f3 x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c th\u1eddi \u0111i\u1ec3m m\u1ed9t t\u00edn hi\u1ec7u ph\u1ea3i t\u0103ng, th\u1eddi \u0111i\u1ec3m d\u1eef li\u1ec7u ph\u1ea3i \u1ed5n \u0111\u1ecbnh, v\u00e0 th\u1eddi gian m\u00e0 b\u1ed9 x\u1eed l\u00fd ph\u1ea3i ch\u1edd tr\u01b0\u1edbc khi ti\u1ebfp t\u1ee5c. \u0110\u1ed1i v\u1edbi c\u00e1c k\u1ef9 s\u01b0 l\u00e0m vi\u1ec7c tr\u00ean h\u1ec7 th\u1ed1ng nh\u00fang, vi \u0111i\u1ec1u khi\u1ec3n ho\u1eb7c c\u00e1c \u1ee9ng d\u1ee5ng th\u1eddi gian th\u1ef1c, vi\u1ec7c hi\u1ec3u c\u00e1ch l\u1eadp b\u1ea3n \u0111\u1ed3 c\u00e1c d\u00f2ng th\u1eddi gian n\u00e0y l\u00e0 \u0111i\u1ec1u then ch\u1ed1t. H\u01b0\u1edbng d\u1eabn n\u00e0y cung c\u1ea5p m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p c\u00f3 c\u1ea5u tr\u00fac \u0111\u1ec3 t\u1ea1o s\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea3n \u00e1nh ch\u00ednh x\u00e1c d\u00f2ng th\u1eddi gian ph\u1ea7n m\u1ec1m c\u1ee7a b\u1ea1n, \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady v\u00e0 ng\u0103n ng\u1eeba c\u00e1c \u0111i\u1ec1u ki\u1ec7n \u0111ua tinh vi.<\/p>\n<figure class=\"wp-block-image aligncenter\"><img alt=\"Charcoal contour sketch infographic showing a 5-phase method for mapping firmware timing diagrams: gathering hardware specs from datasheets, identifying critical clock\/data\/control signals, defining clock domains with cycle calculations, mapping signal transitions from trigger to teardown, and validating setup\/hold time windows; includes simplified waveform example, protocol comparison icons for UART\/SPI\/I2C\/CAN, and visual callouts for common pitfalls like propagation delay and interrupt latency\" decoding=\"async\" src=\"https:\/\/mayaharper.showcasingme.net\/wp-content\/uploads\/2026\/04\/timing-diagrams-firmware-timeline-mapping-infographic-charcoal-sketch.jpg\"\/><\/figure>\n<h2>\ud83e\udde9 Hi\u1ec3u r\u00f5 n\u1ec1n t\u1ea3ng c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian<\/h2>\n<p>Tr\u01b0\u1edbc khi b\u1eaft tay v\u00e0o qu\u00e1 tr\u00ecnh l\u1eadp b\u1ea3n \u0111\u1ed3, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i hi\u1ec3u s\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u1ea1i di\u1ec7n cho \u0111i\u1ec1u g\u00ec trong b\u1ed1i c\u1ea3nh ph\u1ea7n m\u1ec1m nh\u00fang. N\u00f3 kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 m\u1ed9t b\u1ee9c tranh v\u1ec1 s\u00f3ng; m\u00e0 l\u00e0 b\u1ea3n \u0111\u1ed3 th\u1eddi gian c\u1ee7a m\u1ed1i quan h\u1ec7 nh\u00e2n qu\u1ea3. M\u1ed7i chuy\u1ec3n \u0111\u1ed5i tr\u00ean \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u s\u1ebd k\u00edch ho\u1ea1t m\u1ed9t ph\u1ea3n \u1ee9ng \u1edf n\u01a1i kh\u00e1c trong h\u1ec7 th\u1ed1ng. S\u01a1 \u0111\u1ed3 ghi l\u1ea1i nh\u1eefng m\u1ed1i quan h\u1ec7 n\u00e0y d\u1ecdc theo tr\u1ee5c ngang \u0111\u1ea1i di\u1ec7n cho th\u1eddi gian.<\/p>\n<ul>\n<li><strong>Tr\u1ee5c th\u1eddi gian:<\/strong> \u0110\u01b0\u1eddng th\u1eb3ng ngang th\u01b0\u1eddng ti\u1ebfn t\u1eeb tr\u00e1i sang ph\u1ea3i, \u0111\u1ea1i di\u1ec7n cho micro gi\u00e2y ho\u1eb7c nano gi\u00e2y.<\/li>\n<li><strong> C\u00e1c \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u:<\/strong> C\u00e1c \u0111\u01b0\u1eddng d\u1ecdc \u0111\u1ea1i di\u1ec7n cho c\u00e1c d\u00e2y d\u1eabn c\u1ee5 th\u1ec3, bus ho\u1eb7c tr\u1ea1ng th\u00e1i logic.<\/li>\n<li><strong> C\u00e1c s\u1ef1 ki\u1ec7n:<\/strong> Nh\u1eefng \u0111i\u1ec3m c\u1ee5 th\u1ec3 khi t\u00edn hi\u1ec7u thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u1ea1nh xung \u0111\u1ed3ng h\u1ed3 ho\u1eb7c chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u.<\/li>\n<li><strong> C\u00e1c \u0111\u1ed9 tr\u1ec5:<\/strong> Kho\u1ea3ng c\u00e1ch gi\u1eefa t\u00edn hi\u1ec7u k\u00edch ho\u1ea1t v\u00e0 ph\u1ea3n h\u1ed3i, th\u01b0\u1eddng do th\u1eddi gian lan truy\u1ec1n ho\u1eb7c \u0111\u1ed9 tr\u1ec5 ph\u1ea7n m\u1ec1m.<\/li>\n<\/ul>\n<p>Khi l\u1eadp b\u1ea3n \u0111\u1ed3 ph\u1ea7n m\u1ec1m nh\u00fang, b\u1ea1n th\u1ef1c ch\u1ea5t \u0111ang chuy\u1ec3n \u0111\u1ed5i lu\u1ed3ng th\u1ef1c thi m\u00e3 ngu\u1ed3n th\u00e0nh h\u00e0nh vi t\u00edn hi\u1ec7u v\u1eadt l\u00fd. V\u00ed d\u1ee5, m\u1ed9t l\u1eddi g\u1ecdi h\u00e0m trong m\u00e3 C c\u00f3 th\u1ec3 m\u1ea5t 50 chu k\u1ef3 \u0111\u1ed3ng h\u1ed3. Trong s\u01a1 \u0111\u1ed3 th\u1eddi gian, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c chuy\u1ec3n th\u00e0nh m\u1ed9t kho\u1ea3ng th\u1eddi gian c\u1ee5 th\u1ec3 tr\u00ean tr\u1ee5c th\u1eddi gian, trong \u0111\u00f3 m\u1ed9t ch\u00e2n GPIO c\u1ee5 th\u1ec3 c\u00f3 th\u1ec3 duy tr\u00ec tr\u1ea1ng th\u00e1i cao. Vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i n\u00e0y ch\u00ednh l\u00e0 th\u00e1ch th\u1ee9c c\u1ed1t l\u00f5i c\u1ee7a c\u00f4ng vi\u1ec7c.<\/p>\n<h2>\u2699\ufe0f T\u1ea1i sao \u0111\u1ed9 ch\u00ednh x\u00e1c l\u1ea1i quan tr\u1ecdng trong logic nh\u00fang<\/h2>\n<p>C\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang th\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng d\u01b0\u1edbi nh\u1eefng gi\u1edbi h\u1ea1n nghi\u00eam ng\u1eb7t. Kh\u00e1c v\u1edbi t\u00ednh to\u00e1n th\u00f4ng th\u01b0\u1eddng, n\u01a1i m\u1ed9t \u0111\u1ed9 tr\u1ec5 nh\u1ecf ch\u1ec9 l\u00e0m ch\u1eadm giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng, c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang c\u00f3 th\u1ec3 \u0111i\u1ec1u khi\u1ec3n m\u00e1y m\u00f3c v\u1eadt l\u00fd, c\u01a1 ch\u1ebf an to\u00e0n ho\u1eb7c c\u00e1c giao th\u1ee9c truy\u1ec1n th\u00f4ng. M\u1ed9t sai l\u1ec7ch v\u00e0i nano gi\u00e2y trong s\u01a1 \u0111\u1ed3 th\u1eddi gian c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn l\u1ed7i d\u1eef li\u1ec7u, h\u01b0 h\u1ecfng ph\u1ea7n c\u1ee9ng ho\u1eb7c b\u1ea5t \u1ed5n h\u1ec7 th\u1ed1ng.<\/p>\n<p>H\u00e3y xem x\u00e9t m\u1ed9t giao th\u1ee9c truy\u1ec1n th\u00f4ng nh\u01b0 I2C. Thi\u1ebft b\u1ecb ch\u1ee7 ph\u1ea3i gi\u1ea3i ph\u00f3ng \u0111\u01b0\u1eddng SDA tr\u01b0\u1edbc khi \u0111\u01b0\u1eddng \u0111\u1ed3ng h\u1ed3 SCL chuy\u1ec3n tr\u1ea1ng th\u00e1i. N\u1ebfu ph\u1ea7n m\u1ec1m nh\u00fang m\u1ea5t qu\u00e1 nhi\u1ec1u th\u1eddi gian \u0111\u1ec3 gi\u1ea3i ph\u00f3ng \u0111\u01b0\u1eddng d\u1eabn, thi\u1ebft b\u1ecb ph\u1ee5 c\u00f3 th\u1ec3 hi\u1ec3u sai t\u00edn hi\u1ec7u. S\u01a1 \u0111\u1ed3 th\u1eddi gian x\u00e1c \u0111\u1ecbnh &#8216;kho\u1ea3ng th\u1eddi gian c\u01a1 h\u1ed9i&#8217; cho h\u00e0nh \u0111\u1ed9ng n\u00e0y. B\u1eb1ng c\u00e1ch l\u1eadp b\u1ea3n \u0111\u1ed3 r\u00f5 r\u00e0ng, b\u1ea1n s\u1ebd x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00e1c gi\u1edbi h\u1ea1n m\u00e0 m\u00e3 ngu\u1ed3n ph\u1ea3i tu\u00e2n theo.<\/p>\n<p>Nh\u1eefng l\u00fd do ch\u00ednh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u00ednh x\u00e1c bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>\u0110\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u:<\/strong>\u0110\u1ea3m b\u1ea3o c\u00e1c m\u1ee9c \u0111i\u1ec7n \u00e1p \u0111\u1ea1t y\u00eau c\u1ea7u tr\u01b0\u1edbc khi l\u1ea5y m\u1eabu.<\/li>\n<li><strong>\u0110i\u1ec1u ph\u1ed1i truy c\u1eadp bus:<\/strong>Qu\u1ea3n l\u00fd ai \u0111ang \u0111i\u1ec1u khi\u1ec3n bus t\u1ea1i b\u1ea5t k\u1ef3 th\u1eddi \u0111i\u1ec3m n\u00e0o.<\/li>\n<li><strong>\u0110\u1ed9 tr\u1ec5 ng\u1eaft:<\/strong>Bi\u1ebft \u0111\u01b0\u1ee3c h\u1ec7 th\u1ed1ng ph\u1ea3n h\u1ed3i nhanh \u0111\u1ebfn \u0111\u00e2u tr\u01b0\u1edbc c\u00e1c s\u1ef1 ki\u1ec7n b\u00ean ngo\u00e0i.<\/li>\n<li><strong>Qu\u1ea3n l\u00fd n\u0103ng l\u01b0\u1ee3ng:<\/strong>\u0110i\u1ec1u ph\u1ed1i ch\u1ebf \u0111\u1ed9 ng\u1ee7 v\u1edbi c\u00e1c t\u00edn hi\u1ec7u \u0111\u00e1nh th\u1ee9c.<\/li>\n<\/ul>\n<h2>\ud83d\udccb Giai \u0111o\u1ea1n 1: Thu th\u1eadp th\u00f4ng s\u1ed1 ph\u1ea7n c\u1ee9ng<\/h2>\n<p>B\u01b0\u1edbc \u0111\u1ea7u ti\u00ean trong vi\u1ec7c l\u1eadp b\u1ea3n \u0111\u1ed3 d\u00f2ng th\u1eddi gian l\u00e0 thu th\u1eadp s\u1ef1 th\u1eadt c\u01a1 b\u1ea3n. B\u1ea1n kh\u00f4ng th\u1ec3 l\u1eadp b\u1ea3n \u0111\u1ed3 d\u00f2ng th\u1eddi gian n\u1ebfu kh\u00f4ng bi\u1ebft gi\u1edbi h\u1ea1n v\u1eadt l\u00fd c\u1ee7a ph\u1ea7n c\u1ee9ng. Giai \u0111o\u1ea1n n\u00e0y bao g\u1ed3m vi\u1ec7c thu th\u1eadp d\u1eef li\u1ec7u t\u1eeb s\u1ed5 tay d\u1eef li\u1ec7u, s\u01a1 \u0111\u1ed3 m\u1ea1ch v\u00e0 t\u00e0i li\u1ec7u h\u01b0\u1edbng d\u1eabn ph\u1ea7n c\u1ee9ng.<\/p>\n<ol>\n<li><strong>Xem x\u00e9t s\u1ed5 tay d\u1eef li\u1ec7u:<\/strong>T\u00ecm ki\u1ebfm c\u00e1c \u0111\u1eb7c t\u00ednh \u0111i\u1ec7n. M\u1ee9c \u0111i\u1ec7n \u00e1p t\u1ed1i \u0111a v\u00e0 t\u1ed1i thi\u1ec3u cho tr\u1ea1ng th\u00e1i logic cao v\u00e0 logic th\u1ea5p l\u00e0 bao nhi\u00eau? Th\u1eddi gian t\u0103ng v\u00e0 gi\u1ea3m l\u00e0 bao nhi\u00eau?<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh t\u1ea7n s\u1ed1 \u0111\u1ed3ng h\u1ed3:<\/strong>Ghi l\u1ea1i t\u1ed1c \u0111\u1ed9 \u0111\u1ed3ng h\u1ed3 h\u1ec7 th\u1ed1ng v\u00e0 t\u1ed1c \u0111\u1ed9 \u0111\u1ed3ng h\u1ed3 c\u00e1c thi\u1ebft b\u1ecb ngo\u1ea1i vi. \u0110i\u1ec1u n\u00e0y x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ee7a tr\u1ee5c th\u1eddi gian c\u1ee7a b\u1ea1n.<\/li>\n<li><strong>Ki\u1ec3m tra c\u00e1c gi\u1edbi h\u1ea1n v\u1ec1 th\u1eddi gian:<\/strong>H\u1ea7u h\u1ebft c\u00e1c thi\u1ebft b\u1ecb ngo\u1ea1i vi \u0111\u1ec1u c\u00f3 y\u00eau c\u1ea7u v\u1ec1 th\u1eddi gian c\u1ee5 th\u1ec3. H\u00e3y t\u00ecm c\u00e1c ph\u1ea7n \u0111\u01b0\u1ee3c \u0111\u00e1nh nh\u00e3n l\u00e0 \u201c\u0110\u1eb7c t\u00ednh th\u1eddi gian AC\u201d ho\u1eb7c \u201cTh\u00f4ng s\u1ed1 \u0111i\u1ec7n\u201d.<\/li>\n<li><strong>Hi\u1ec3u v\u1ec1 \u0111a ch\u1ee9c n\u0103ng ch\u00e2n:<\/strong>N\u1ebfu m\u1ed9t ch\u00e2n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n nhi\u1ec1u ch\u1ee9c n\u0103ng kh\u00e1c nhau, h\u00e3y bi\u1ebft \u0111\u1eb7c t\u00ednh \u0111i\u1ec7n n\u00e0o \u00e1p d\u1ee5ng cho d\u00f2ng th\u1eddi gian ph\u1ea7n m\u1ec1m.<\/li>\n<\/ol>\n<p>Th\u00f4ng tin n\u00e0y t\u1ea1o th\u00e0nh c\u00e1c gi\u1edbi h\u1ea1n m\u00e0 ph\u1ea7n m\u1ec1m c\u1ee7a b\u1ea1n ph\u1ea3i ho\u1ea1t \u0111\u1ed9ng. N\u1ebfu ph\u1ea7n c\u1ee9ng y\u00eau c\u1ea7u kho\u1ea3ng tr\u1ec5 10 microgi\u00e2y gi\u1eefa hai thao t\u00e1c, s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n ph\u1ea3i ph\u1ea3n \u00e1nh kho\u1ea3ng c\u00e1ch \u0111\u00f3.<\/p>\n<h2>\ud83d\udce1 Giai \u0111o\u1ea1n 2: X\u00e1c \u0111\u1ecbnh c\u00e1c t\u00edn hi\u1ec7u quan tr\u1ecdng<\/h2>\n<p>Kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c t\u00edn hi\u1ec7u \u0111\u1ec1u nh\u01b0 nhau. Trong m\u1ed9t h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p, c\u00f3 th\u1ec3 c\u00f3 h\u00e0ng ch\u1ee5c \u0111\u01b0\u1eddng GPIO. T\u1eadp trung v\u00e0o t\u1eebng d\u00e2y d\u1eabn s\u1ebd l\u00e0m r\u1ed1i s\u01a1 \u0111\u1ed3 v\u00e0 che khu\u1ea5t \u0111\u01b0\u1eddng \u0111i quan tr\u1ecdng. B\u1ea1n ph\u1ea3i x\u00e1c \u0111\u1ecbnh c\u00e1c t\u00edn hi\u1ec7u quy\u1ebft \u0111\u1ecbnh lu\u1ed3ng ph\u1ea7n m\u1ec1m.<\/p>\n<ul>\n<li><strong>T\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3:<\/strong>\u0110\u1eadp tim c\u1ee7a h\u1ec7 th\u1ed1ng. Ch\u00fang x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 ph\u00e2n gi\u1ea3i v\u1ec1 th\u1eddi gian.<\/li>\n<li><strong>C\u00e1c \u0111\u01b0\u1eddng d\u1eef li\u1ec7u:<\/strong>Th\u00f4ng tin th\u1ef1c s\u1ef1 \u0111ang \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i.<\/li>\n<li><strong>C\u00e1c \u0111\u01b0\u1eddng \u0111i\u1ec1u khi\u1ec3n:<\/strong>C\u00e1c t\u00edn hi\u1ec7u nh\u01b0 Chip Select, Ready ho\u1eb7c \u0111\u01b0\u1eddng ng\u1eaft, x\u00e1c \u0111\u1ecbnh khi n\u00e0o vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u c\u00f3 th\u1ec3 x\u1ea3y ra.<\/li>\n<li><strong>C\u00e1c t\u00edn hi\u1ec7u tr\u1ea1ng th\u00e1i:<\/strong>C\u1edd b\u00e1o tr\u1ea1ng th\u00e1i ho\u00e0n th\u00e0nh ho\u1eb7c l\u1ed7i.<\/li>\n<\/ul>\n<p>Khi t\u1ea1o s\u01a1 \u0111\u1ed3, h\u00e3y nh\u00f3m c\u00e1c t\u00edn hi\u1ec7u n\u00e0y m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd. V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n \u0111ang l\u1eadp b\u1ea3n \u0111\u1ed3 cho m\u1ed9t giao th\u1ee9c SPI, h\u00e3y nh\u00f3m c\u00e1c \u0111\u01b0\u1eddng MOSI, MISO, SCK v\u00e0 CS l\u1ea1i v\u1edbi nhau. Kh\u00f4ng n\u00ean tr\u1ed9n ch\u00fang v\u1edbi c\u00e1c t\u00edn hi\u1ec7u qu\u1ea3n l\u00fd ngu\u1ed3n \u0111i\u1ec7n kh\u00f4ng li\u00ean quan, tr\u1eeb khi tr\u1ea1ng th\u00e1i ngu\u1ed3n \u0111i\u1ec7n tr\u1ef1c ti\u1ebfp \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u.<\/p>\n<h2>\u23f0 Giai \u0111o\u1ea1n 3: X\u00e1c \u0111\u1ecbnh mi\u1ec1n \u0111\u1ed3ng h\u1ed3<\/h2>\n<p>S\u01a1 \u0111\u1ed3 th\u1eddi gian s\u1ebd v\u00f4 ngh\u0129a n\u1ebfu kh\u00f4ng c\u00f3 tham chi\u1ebfu v\u1ec1 th\u1eddi gian. Trong ph\u1ea7n m\u1ec1m nh\u00fang, tham chi\u1ebfu n\u00e0y th\u01b0\u1eddng l\u00e0 \u0111\u1ed3ng h\u1ed3 b\u1ed9 x\u1eed l\u00fd ho\u1eb7c \u0111\u1ed3ng h\u1ed3 c\u1ee5 th\u1ec3 c\u1ee7a m\u1ed9t thi\u1ebft b\u1ecb ngo\u1ea1i vi. Vi\u1ec7c x\u00e1c \u0111\u1ecbnh mi\u1ec1n \u0111\u1ed3ng h\u1ed3 gi\u00fap t\u00ednh to\u00e1n th\u1eddi gian th\u1ef1c hi\u1ec7n c\u00e1c thao t\u00e1c ph\u1ea7n m\u1ec1m.<\/p>\n<p>V\u00ed d\u1ee5, n\u1ebfu vi \u0111i\u1ec1u khi\u1ec3n c\u1ee7a b\u1ea1n ch\u1ea1y \u1edf 100 MHz, m\u1ed9t chu k\u1ef3 \u0111\u1ed3ng h\u1ed3 l\u00e0 10 nanosecond. N\u1ebfu m\u1ed9t v\u00f2ng l\u1eb7p m\u1ea5t 100 l\u1ea7n l\u1eb7p, th\u00ec \u0111\u00f3 l\u00e0 1 microgi\u00e2y. B\u1ea1n c\u00f3 th\u1ec3 ghi ch\u00fa \u0111i\u1ec1u n\u00e0y tr\u00ean s\u01a1 \u0111\u1ed3. Tuy nhi\u00ean, b\u1ea1n ph\u1ea3i t\u00ednh \u0111\u1ebfn:<\/p>\n<ul>\n<li><strong>T\u1eafc ngh\u1ebdn \u1ed1ng d\u1eabn:<\/strong>C\u00e1c b\u1ed9 x\u1eed l\u00fd hi\u1ec7n \u0111\u1ea1i c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm vi\u1ec7c th\u1ef1c thi d\u1ef1a tr\u00ean c\u00e1c ph\u1ee5 thu\u1ed9c gi\u1eefa c\u00e1c l\u1ec7nh.<\/li>\n<li><strong>Xung \u0111\u1ed9t bus:<\/strong>N\u1ebfu CPU \u0111ang ch\u1edd truy c\u1eadp b\u1ed9 nh\u1edb, th\u1eddi gian hi\u1ec7u qu\u1ea3 cho s\u1ef1 thay \u0111\u1ed5i t\u00edn hi\u1ec7u s\u1ebd t\u0103ng l\u00ean.<\/li>\n<li><strong>Ng\u1eaft:<\/strong>C\u00e1c ng\u1eaft \u01b0u ti\u00ean cao c\u00f3 th\u1ec3 chi\u1ebfm quy\u1ec1n lu\u1ed3ng ch\u00ednh, l\u00e0m thay \u0111\u1ed5i d\u00f2ng th\u1eddi gian.<\/li>\n<\/ul>\n<p>Th\u01b0\u1eddng h\u1eefu \u00edch khi \u0111\u00e1nh d\u1ea5u c\u00e1c nh\u1ecbp \u0111\u1ed3ng h\u1ed3 tr\u00ean tr\u1ee5c ngang. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra m\u1ed9t l\u01b0\u1edbi h\u00ecnh \u1ea3nh gi\u00fap \u01b0\u1edbc l\u01b0\u1ee3ng th\u1eddi gian ch\u00ednh x\u00e1c h\u01a1n. N\u1ebfu b\u1ea1n kh\u00f4ng th\u1ec3 \u0111o ch\u00ednh x\u00e1c s\u1ed1 chu k\u1ef3, h\u00e3y d\u00f9ng c\u00e1c \u01b0\u1edbc l\u01b0\u1ee3ng th\u1eadn tr\u1ecdng d\u1ef1a tr\u00ean t\u00e0i li\u1ec7u ki\u1ebfn tr\u00fac t\u1eadp l\u1ec7nh.<\/p>\n<h2>\ud83d\udd04 Giai \u0111o\u1ea1n 4: B\u1ea3n \u0111\u1ed3 c\u00e1c chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u<\/h2>\n<p>\u0110\u00e2y l\u00e0 c\u1ed1t l\u00f5i c\u1ee7a qu\u00e1 tr\u00ecnh b\u1ea3n \u0111\u1ed3 h\u00f3a. B\u00e2y gi\u1edd b\u1ea1n \u0111ang chuy\u1ec3n \u0111\u1ed5i c\u00e1c b\u01b0\u1edbc logic trong m\u00e3 c\u1ee7a m\u00ecnh th\u00e0nh c\u00e1c thay \u0111\u1ed5i t\u00edn hi\u1ec7u v\u1eadt l\u00fd. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi ph\u00e2n t\u00edch t\u1eebng d\u00f2ng m\u00e3 trong c\u00e1c \u0111o\u1ea1n ph\u1ea7n m\u1ec1m quan tr\u1ecdng.<\/p>\n<ol>\n<li><strong>B\u1eaft \u0111\u1ea7u b\u1eb1ng s\u1ef1 ki\u1ec7n k\u00edch ho\u1ea1t:<\/strong>X\u00e1c \u0111\u1ecbnh \u0111i\u1ec1u g\u00ec kh\u1edfi \u0111\u1ed9ng chu\u1ed7i. C\u00f3 ph\u1ea3i l\u00e0 thao t\u00e1c nh\u1ea5n n\u00fat? Ng\u1eaft b\u1ed9 \u0111\u1ebfm th\u1eddi gian? M\u1ed9t g\u00f3i tin \u0111\u01b0\u1ee3c nh\u1eadn?<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh c\u00e1c thi\u1ebft l\u1eadp ban \u0111\u1ea7u:<\/strong>Tr\u01b0\u1edbc khi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c g\u1eedi, nh\u1eefng ch\u00e2n n\u00e0o c\u1ea7n \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh? \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 bao g\u1ed3m thi\u1ebft l\u1eadp c\u00e1c thanh ghi h\u01b0\u1edbng \u0111i ho\u1eb7c k\u00edch ho\u1ea1t \u0111\u1ed3ng h\u1ed3. Ghi ch\u00fa c\u00e1c tr\u1ea1ng th\u00e1i n\u00e0y tr\u00ean s\u01a1 \u0111\u1ed3.<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh qu\u00e1 tr\u00ecnh th\u1ef1c thi:<\/strong>Trong qu\u00e1 tr\u00ecnh m\u00e3 ch\u1ea1y, ghi l\u1ea1i th\u1eddi \u0111i\u1ec3m c\u00e1c ch\u00e2n c\u1ee5 th\u1ec3 thay \u0111\u1ed5i. V\u00ed d\u1ee5, khi m\u1ed9t v\u00f2ng l\u1eb7p ghi v\u00e0o thanh ghi, ch\u00e2n GPIO c\u00f3 chuy\u1ec3n tr\u1ea1ng th\u00e1i ngay l\u1eadp t\u1ee9c kh\u00f4ng? Hay c\u00f3 b\u1ed9 \u0111\u1ec7m?<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh th\u1eddi gian ch\u1edd:<\/strong>N\u1ebfu m\u00e3 g\u1ecdi h\u00e0m \u0111\u1ed9 tr\u1ec5, h\u00e3y v\u1ebd m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng ngang \u0111\u1ec3 ch\u1ec9 r\u1eb1ng t\u00edn hi\u1ec7u gi\u1eef nguy\u00ean trong kho\u1ea3ng th\u1eddi gian \u0111\u00f3.<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh c\u00e1c b\u01b0\u1edbc d\u1ecdn d\u1eb9p:<\/strong>Sau thao t\u00e1c, nh\u1eefng ch\u00e2n n\u00e0o \u0111\u01b0\u1ee3c \u0111\u1eb7t l\u1ea1i? \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c giao th\u1ee9c y\u00eau c\u1ea7u tr\u1ea1ng th\u00e1i ch\u1edd \u0111\u1eb7c bi\u1ec7t.<\/li>\n<\/ol>\n<p>Trong giai \u0111o\u1ea1n n\u00e0y, h\u00e3y ch\u00fa \u00fd \u0111\u1ebfn c\u00e1c c\u1ea1nh c\u1ee7a t\u00edn hi\u1ec7u. M\u1ed9t c\u1ea1nh t\u0103ng c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t b\u1ed9 nh\u1eadn. M\u1ed9t c\u1ea1nh gi\u1ea3m c\u00f3 th\u1ec3 cho bi\u1ebft k\u1ebft th\u00fac m\u1ed9t byte. S\u01a1 \u0111\u1ed3 ph\u1ea3i ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng gi\u1eefa c\u00e1c tr\u1ea1ng th\u00e1i \u1ed5n \u0111\u1ecbnh v\u00e0 c\u00e1c giai \u0111o\u1ea1n chuy\u1ec3n ti\u1ebfp.<\/p>\n<h2>\u23f3 Giai \u0111o\u1ea1n 5: X\u00e1c minh th\u1eddi gian thi\u1ebft l\u1eadp v\u00e0 gi\u1eef<\/h2>\n<p>M\u1ed9t trong nh\u1eefng nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn nh\u1ea5t g\u00e2y l\u1ed7i ph\u1ea7n c\u1ee9ng l\u00e0 vi ph\u1ea1m th\u1eddi gian thi\u1ebft l\u1eadp v\u00e0 gi\u1eef. \u0110\u00e2y l\u00e0 kho\u1ea3ng th\u1eddi gian t\u1ed1i thi\u1ec3u m\u00e0 d\u1eef li\u1ec7u ph\u1ea3i \u1ed5n \u0111\u1ecbnh tr\u01b0\u1edbc v\u00e0 sau c\u1ea1nh \u0111\u1ed3ng h\u1ed3. S\u01a1 \u0111\u1ed3 th\u1eddi gian c\u1ee7a b\u1ea1n ph\u1ea3i l\u00e0m n\u1ed5i b\u1eadt r\u00f5 r\u00e0ng c\u00e1c kho\u1ea3ng th\u1eddi gian n\u00e0y.<\/p>\n<p><strong>Th\u1eddi gian thi\u1ebft l\u1eadp:<\/strong>Th\u1eddi gian d\u1eef li\u1ec7u ph\u1ea3i h\u1ee3p l\u1ec7 tr\u01b0\u1edbc khi c\u00f3 c\u1ea1nh \u0111\u1ed3ng h\u1ed3. N\u1ebfu ph\u1ea7n m\u1ec1m c\u1ee7a b\u1ea1n m\u1ea5t qu\u00e1 nhi\u1ec1u th\u1eddi gian \u0111\u1ec3 chu\u1ea9n b\u1ecb d\u1eef li\u1ec7u, ph\u1ea7n c\u1ee9ng s\u1ebd l\u1ea5y m\u1eabu d\u1eef li\u1ec7u sai.<\/p>\n<p><strong>Th\u1eddi gian gi\u1eef:<\/strong>Th\u1eddi gian d\u1eef li\u1ec7u ph\u1ea3i duy tr\u00ec h\u1ee3p l\u1ec7 sau khi c\u00f3 c\u1ea1nh \u0111\u1ed3ng h\u1ed3. N\u1ebfu ph\u1ea7n m\u1ec1m thay \u0111\u1ed5i \u0111\u01b0\u1eddng truy\u1ec1n qu\u00e1 nhanh, b\u1ed9 nh\u1eadn c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y m\u1ed9t chuy\u1ec3n \u0111\u1ed5i trong kho\u1ea3ng th\u1eddi gian l\u1ea5y m\u1eabu.<\/p>\n<p>\u0110\u1ec3 x\u00e1c minh \u0111i\u1ec1u n\u00e0y, h\u00e3y v\u1ebd c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1ee9ng tr\u00ean s\u01a1 \u0111\u1ed3 \u0111\u1ec3 \u0111\u00e1nh d\u1ea5u c\u00e1c c\u1ea1nh \u0111\u1ed3ng h\u1ed3. Sau \u0111\u00f3, v\u1ebd c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1ee9ng \u0111\u1ec3 \u0111\u00e1nh d\u1ea5u c\u00e1c kho\u1ea3ng th\u1eddi gian d\u1eef li\u1ec7u h\u1ee3p l\u1ec7. \u0110\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 s\u1ef1 ch\u1ed3ng l\u1ea5n n\u00e0o vi ph\u1ea1m c\u00e1c gi\u1edbi h\u1ea1n. N\u1ebfu logic ph\u1ea7n m\u1ec1m qu\u00e1 ch\u1eb7t ch\u1ebd, b\u1ea1n c\u00f3 th\u1ec3 c\u1ea7n ch\u00e8n c\u00e1c tr\u1ea1ng th\u00e1i ch\u1edd r\u00f5 r\u00e0ng ho\u1eb7c t\u1ed1i \u01b0u h\u00f3a \u0111\u01b0\u1eddng \u0111i m\u00e3.<\/p>\n<h2>\ud83d\udce1 C\u00e1c giao th\u1ee9c truy\u1ec1n th\u00f4ng ph\u1ed5 bi\u1ebfn<\/h2>\n<p>C\u00e1c giao th\u1ee9c kh\u00e1c nhau c\u00f3 y\u00eau c\u1ea7u th\u1eddi gian kh\u00e1c nhau. Khi l\u1eadp b\u1ea3n \u0111\u1ed3 ph\u1ea7n m\u1ec1m cho c\u00e1c giao th\u1ee9c n\u00e0y, b\u1ea1n n\u00ean tham kh\u1ea3o c\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian ti\u00eau chu\u1ea9n cho ch\u00ednh giao th\u1ee9c \u0111\u00f3.<\/p>\n<table>\n<thead>\n<tr>\n<th>Giao th\u1ee9c<\/th>\n<th>\u0110\u1eb7c \u0111i\u1ec3m th\u1eddi gian ch\u00ednh<\/th>\n<th>Xem x\u00e9t ph\u1ea7n m\u1ec1m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>UART<\/td>\n<td>\u0110\u1ed3ng b\u1ed9 t\u1ed1c \u0111\u1ed9 truy\u1ec1n<\/td>\n<td>\u0110\u1ea3m b\u1ea3o vi\u1ec7c l\u1ea5y m\u1eabu x\u1ea3y ra \u1edf ch\u00ednh gi\u1eefa kho\u1ea3ng th\u1eddi gian bit.<\/td>\n<\/tr>\n<tr>\n<td>SPI<\/td>\n<td>\u0110\u1ed9 c\u1ef1c v\u00e0 pha c\u1ee7a \u0111\u1ed3ng h\u1ed3<\/td>\n<td>Ph\u00f9 h\u1ee3p v\u1edbi c\u1ea1nh \u0111\u1ed3ng h\u1ed3 n\u01a1i d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u1ea5y m\u1eabu v\u00e0 d\u1ecbch chuy\u1ec3n.<\/td>\n<\/tr>\n<tr>\n<td>I2C<\/td>\n<td>T\u1ed1c \u0111\u1ed9 thay \u0111\u1ed5i v\u00e0 th\u1eddi gian gi\u1eef<\/td>\n<td>Cho ph\u00e9p \u0111\u1ee7 th\u1eddi gian \u0111\u1ec3 c\u00e1c \u0111i\u1ec7n tr\u1edf k\u00e9o l\u00ean open-drain t\u0103ng l\u00ean.<\/td>\n<\/tr>\n<tr>\n<td>CAN<\/td>\n<td>C\u00e1c \u0111o\u1ea1n th\u1eddi gian bit<\/td>\n<td>C\u1ea5u h\u00ecnh c\u00e1c \u0111\u01a1n v\u1ecb th\u1eddi gian sao cho ph\u00f9 h\u1ee3p v\u1edbi t\u1ed1c \u0111\u1ed9 m\u1ea1ng.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Khi t\u1ea1o s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n, h\u00e3y ghi nh\u00e3n c\u00e1c \u0111o\u1ea1n giao th\u1ee9c m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng. \u0110\u1ed1i v\u1edbi SPI, h\u00e3y ch\u1ec9 r\u00f5 d\u1eef li\u1ec7u h\u1ee3p l\u1ec7 tr\u01b0\u1edbc hay sau c\u1ea1nh xung clock. \u0110\u1ed1i v\u1edbi I2C, h\u00e3y \u0111\u00e1nh d\u1ea5u r\u00f5 r\u00e0ng c\u00e1c \u0111i\u1ec1u ki\u1ec7n B\u1eaft \u0111\u1ea7u v\u00e0 K\u1ebft th\u00fac. Nh\u1eefng d\u1ea5u hi\u1ec7u tr\u1ef1c quan n\u00e0y gi\u00fap ph\u00e1t hi\u1ec7n c\u00e1c v\u1ea5n \u0111\u1ec1 m\u00e0 giao th\u1ee9c th\u1ea5t b\u1ea1i m\u1ed9t c\u00e1ch im l\u1eb7ng.<\/p>\n<h2>\ud83d\udd0d G\u1ee1 l\u1ed7i c\u00e1c vi ph\u1ea1m v\u1ec1 th\u1eddi gian<\/h2>\n<p>Ngay c\u1ea3 v\u1edbi s\u01a1 \u0111\u1ed3 ho\u00e0n h\u1ea3o, \u0111i\u1ec1u ki\u1ec7n th\u1ef1c t\u1ebf c\u00f3 th\u1ec3 g\u00e2y ra nhi\u1ec5u ho\u1eb7c sai l\u1ec7ch. Khi g\u1ee1 l\u1ed7i, h\u00e3y d\u00f9ng s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0m c\u01a1 s\u1edf tham chi\u1ebfu. N\u1ebfu h\u1ec7 th\u1ed1ng th\u1ea5t b\u1ea1i, h\u00e3y so s\u00e1nh vi\u1ec7c thu t\u00edn hi\u1ec7u th\u1ef1c t\u1ebf v\u1edbi s\u01a1 \u0111\u1ed3 \u0111\u00e3 l\u00ean k\u1ebf ho\u1ea1ch.<\/p>\n<ul>\n<li><strong>Ki\u1ec3m tra c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng xung \u0111\u1ed9t:<\/strong> Nh\u1eefng xung ng\u1eafn c\u00f3 th\u1ec3 b\u1ecb hi\u1ec3u nh\u1ea7m l\u00e0 c\u00e1c c\u1ea1nh h\u1ee3p l\u1ec7. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng cho th\u1ea5y v\u1ea5n \u0111\u1ec1 v\u1ec1 \u0111\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u ho\u1eb7c nhi\u1ec5u chuy\u1ec3n \u0111\u1ed5i.<\/li>\n<li><strong>Ph\u00e2n t\u00edch \u0111\u1ed9 dao \u0111\u1ed9ng:<\/strong> Nh\u1eefng bi\u1ebfn \u0111\u1ed5i trong chu k\u1ef3 clock. N\u1ebfu clock b\u1ecb dao \u0111\u1ed9ng, kho\u1ea3ng th\u1eddi gian thi\u1ebft l\u1eadp c\u1ee7a b\u1ea1n s\u1ebd b\u1ecb thu h\u1eb9p.<\/li>\n<li><strong>Xem x\u00e9t \u0111\u1ed9 tr\u1ec5 do ng\u1eaft:<\/strong> N\u1ebfu m\u1ed9t ng\u1eaft x\u1ea3y ra trong kho\u1ea3ng th\u1eddi gian quan tr\u1ecdng, n\u00f3 c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm ph\u1ea3n h\u1ed3i c\u1ee7a ph\u1ea7n m\u1ec1m. H\u00e3y ki\u1ec3m tra xem \u0111\u1ed9 tr\u1ec5 ng\u1eaft c\u00f3 ph\u00f9 h\u1ee3p trong kho\u1ea3ng th\u1eddi gian \u0111\u01b0\u1ee3c ph\u00e9p hay kh\u00f4ng.<\/li>\n<li><strong>X\u00e1c minh c\u00e1c ph\u00e9p truy\u1ec1n DMA:<\/strong> Truy c\u1eadp b\u1ed9 nh\u1edb tr\u1ef1c ti\u1ebfp c\u00f3 th\u1ec3 b\u1ecf qua CPU. \u0110\u1ea3m b\u1ea3o b\u1ed9 \u0111i\u1ec1u khi\u1ec3n DMA kh\u00f4ng truy c\u1eadp b\u1ed9 nh\u1edb khi CPU c\u1ea7n n\u00f3, g\u00e2y ra \u0111\u1ed9 tr\u1ec5 do xung \u0111\u1ed9t bus.<\/li>\n<\/ul>\n<p>G\u1ee1 l\u1ed7i th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn vi\u1ec7c t\u00ecm ra kho\u1ea3ng c\u00e1ch gi\u1eefa s\u01a1 \u0111\u1ed3 l\u00fd t\u01b0\u1edfng v\u00e0 th\u1ef1c t\u1ebf v\u1eadt l\u00fd. S\u01a1 \u0111\u1ed3 gi\u00fap b\u1ea1n \u0111\u1eb7t ra nh\u1eefng c\u00e2u h\u1ecfi \u0111\u00fang \u0111\u1eafn: T\u00edn hi\u1ec7u \u0111\u00e3 thay \u0111\u1ed5i qu\u00e1 s\u1edbm hay kh\u00f4ng? C\u1ea1nh clock c\u00f3 \u0111\u1ebfn mu\u1ed9n kh\u00f4ng? C\u00f3 x\u1ea3y ra va ch\u1ea1m bus hay kh\u00f4ng?<\/p>\n<h2>\ud83d\udcdd T\u00e0i li\u1ec7u v\u00e0 chuy\u1ec3n giao<\/h2>\n<p>M\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian s\u1ebd v\u00f4 d\u1ee5ng n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c t\u00e0i li\u1ec7u h\u00f3a v\u00e0 qu\u1ea3n l\u00fd phi\u00ean b\u1ea3n. N\u00f3 ph\u1ee5c v\u1ee5 nh\u01b0 m\u1ed9t t\u00e0i li\u1ec7u tham kh\u1ea3o cho b\u1ea3o tr\u00ec trong t\u01b0\u01a1ng lai v\u00e0 cho c\u00e1c th\u00e0nh vi\u00ean kh\u00e1c trong nh\u00f3m. H\u00e3y coi n\u00f3 nh\u01b0 m\u1ed9t t\u00e0i li\u1ec7u quy chu\u1ea9n ch\u00ednh th\u1ee9c.<\/p>\n<ul>\n<li><strong>Ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n:<\/strong> Gi\u1eef file s\u01a1 \u0111\u1ed3 trong c\u00f9ng m\u1ed9t kho l\u01b0u tr\u1eef v\u1edbi ph\u1ea7n m\u1ec1m. C\u1eadp nh\u1eadt n\u00f3 m\u1ed7i khi logic m\u00e3 thay \u0111\u1ed5i.<\/li>\n<li><strong>Ghi ch\u00fa:<\/strong> Th\u00eam ghi ch\u00fa gi\u1ea3i th\u00edch l\u00fd do t\u1ea1i sao m\u1ed9t s\u1ed1 \u0111\u1ed9 tr\u1ec5 t\u1ed3n t\u1ea1i. C\u00f3 ph\u1ea3i \u0111\u1ec3 kh\u1edfi t\u1ea1o ph\u1ea7n c\u1ee9ng? \u0110\u1ec3 \u1ed5n \u0111\u1ecbnh t\u00edn hi\u1ec7u? B\u1ed1i c\u1ea3nh n\u00e0y r\u1ea5t c\u00f3 gi\u00e1 tr\u1ecb \u0111\u1ed1i v\u1edbi c\u00e1c k\u1ef9 s\u01b0 t\u01b0\u01a1ng lai.<\/li>\n<li><strong>Ti\u00eau chu\u1ea9n:<\/strong> Tu\u00e2n theo c\u00e1c ti\u00eau chu\u1ea9n ng\u00e0nh khi v\u1ebd s\u01a1 \u0111\u1ed3. S\u1eed d\u1ee5ng \u0111\u1ed9 d\u00e0y \u0111\u01b0\u1eddng, c\u1ee1 ch\u1eef v\u00e0 quy \u01b0\u1edbc ghi nh\u00e3n nh\u1ea5t qu\u00e1n.<\/li>\n<li><strong>Kh\u1ea3 n\u0103ng truy c\u1eadp:<\/strong> \u0110\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea7n m\u1ec1m chuy\u00ean d\u1ee5ng. Xu\u1ea5t sang \u0111\u1ecbnh d\u1ea1ng PDF ho\u1eb7c h\u00ecnh \u1ea3nh \u0111\u1ec3 d\u1ec5 chia s\u1ebb.<\/li>\n<\/ul>\n<p>T\u00e0i li\u1ec7u c\u0169ng bao g\u1ed3m c\u00e1c gi\u1ea3 \u0111\u1ecbnh \u0111\u01b0\u1ee3c \u0111\u01b0a ra. N\u1ebfu s\u01a1 \u0111\u1ed3 gi\u1ea3 \u0111\u1ecbnh m\u1ed9t t\u1ea3i c\u1ee5 th\u1ec3 tr\u00ean bus, h\u00e3y ghi ch\u00fa l\u1ea1i. N\u1ebfu gi\u1ea3 \u0111\u1ecbnh m\u1ed9t ph\u1ea1m vi nhi\u1ec7t \u0111\u1ed9 c\u1ee5 th\u1ec3, h\u00e3y ghi l\u1ea1i. Nh\u1eefng gi\u1edbi h\u1ea1n n\u00e0y l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a ph\u00e2n t\u00edch th\u1eddi gian.<\/p>\n<h2>\u26a0\ufe0f Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh<\/h2>\n<p>Trong khi t\u1ea1o c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y, c\u00f3 nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c d\u00f2ng th\u1eddi gian kh\u00f4ng ch\u00ednh x\u00e1c. Vi\u1ec7c nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c ch\u00fang s\u1ebd gi\u00fap duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u00f4ng vi\u1ec7c c\u1ee7a b\u1ea1n.<\/p>\n<ul>\n<li><strong>B\u1ecf qua \u0111\u1ed9 tr\u1ec5 lan truy\u1ec1n:<\/strong>D\u00e2y d\u1eabn v\u00e0 \u0111\u01b0\u1eddng d\u1eabn c\u00f3 chi\u1ec1u d\u00e0i v\u1eadt l\u00fd. T\u00edn hi\u1ec7u m\u1ea5t th\u1eddi gian \u0111\u1ec3 di chuy\u1ec3n. Kh\u00f4ng n\u00ean gi\u1ea3 \u0111\u1ecbnh \u0111\u1ed9 tr\u1ec5 b\u1eb1ng kh\u00f4ng gi\u1eefa c\u00e1c th\u00e0nh ph\u1ea7n k\u1ebft n\u1ed1i v\u1edbi nhau.<\/li>\n<li><strong>Gi\u1ea3 \u0111\u1ecbnh th\u1ef1c thi m\u00e3 t\u1ee9c th\u00ec:<\/strong>Tr\u00ecnh bi\u00ean d\u1ecbch t\u1ed1i \u01b0u h\u00f3a m\u00e3. M\u1ed9t h\u00e0m c\u00f3 th\u1ec3 ch\u1ea1y nhanh h\u01a1n mong \u0111\u1ee3i, ho\u1eb7c ch\u1eadm h\u01a1n n\u1ebfu g\u00e2y ra c\u00e1c l\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m. H\u00e3y \u0111o th\u1eddi gian th\u1ef1c thi th\u1ef1c t\u1ebf m\u1ed7i khi c\u00f3 th\u1ec3.<\/li>\n<li><strong>B\u1ecf qua c\u00e1c s\u1ef1 ki\u1ec7n b\u1ea5t \u0111\u1ed3ng b\u1ed9:<\/strong>C\u00e1c \u0111\u1ea7u v\u00e0o b\u00ean ngo\u00e0i c\u00f3 th\u1ec3 \u0111\u1ebfn v\u00e0o nh\u1eefng th\u1eddi \u0111i\u1ec3m kh\u00f4ng th\u1ec3 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c. S\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n n\u00ean th\u1ec3 hi\u1ec7n t\u00ecnh hu\u1ed1ng x\u1ea5u nh\u1ea5t cho c\u00e1c s\u1ef1 ki\u1ec7n n\u00e0y.<\/li>\n<li><strong>Tr\u1ed9n l\u1eabn c\u00e1c thang th\u1eddi gian:<\/strong>Kh\u00f4ng \u0111\u01b0\u1ee3c tr\u1ed9n l\u1eabn mili gi\u00e2y v\u00e0 nano gi\u00e2y tr\u00ean c\u00f9ng m\u1ed9t tr\u1ee5c m\u00e0 kh\u00f4ng c\u00f3 ch\u1ec9 b\u00e1o t\u1ef7 l\u1ec7 r\u00f5 r\u00e0ng. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn hi\u1ec3u nh\u1ea7m v\u1ec1 th\u1eddi l\u01b0\u1ee3ng t\u00edn hi\u1ec7u.<\/li>\n<li><strong>B\u1ecf qua c\u00e1c tr\u1ea1ng th\u00e1i ngu\u1ed3n \u0111i\u1ec7n:<\/strong>M\u1ed9t thi\u1ebft b\u1ecb \u1edf ch\u1ebf \u0111\u1ed9 ng\u1ee7 c\u00f3 th\u1ec3 kh\u00f4ng ph\u1ea3n h\u1ed3i t\u00edn hi\u1ec7u ngay l\u1eadp t\u1ee9c. H\u00e3y x\u00e1c \u0111\u1ecbnh r\u00f5 qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i t\u1eeb ch\u1ebf \u0111\u1ed9 ng\u1ee7 sang tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng.<\/li>\n<\/ul>\n<h2>\ud83d\udee0\ufe0f C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho b\u1ea3o tr\u00ec<\/h2>\n<p>S\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 t\u00e0i li\u1ec7u s\u1ed1ng \u0111\u1ed9ng. Khi ph\u1ea7n m\u1ec1m nh\u00fang ph\u00e1t tri\u1ec3n, s\u01a1 \u0111\u1ed3 c\u0169ng ph\u1ea3i ph\u00e1t tri\u1ec3n theo. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t \u0111\u1ec3 duy tr\u00ec \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a s\u01a1 \u0111\u1ed3 trong su\u1ed1t v\u00f2ng \u0111\u1eddi d\u1ef1 \u00e1n.<\/p>\n<ul>\n<li><strong>Xem x\u00e9t l\u1ea1i thay \u0111\u1ed5i m\u00e3 ngu\u1ed3n:<\/strong>M\u1ed7i khi m\u1ed9t h\u00e0m quan tr\u1ecdng \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i, h\u00e3y xem x\u00e9t l\u1ea1i s\u01a1 \u0111\u1ed3. M\u00e3 m\u1edbi v\u1eabn \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u v\u1ec1 th\u1eddi gian ch\u01b0a?<\/li>\n<li><strong>T\u1ef1 \u0111\u1ed9ng h\u00f3a \u1edf m\u1ee9c c\u00f3 th\u1ec3:<\/strong>N\u1ebfu b\u1ea1n c\u00f3 quy\u1ec1n truy c\u1eadp v\u00e0o c\u00f4ng c\u1ee5 ph\u00e2n t\u00edch th\u1eddi gian, h\u00e3y s\u1eed d\u1ee5ng ch\u00fang \u0111\u1ec3 x\u00e1c minh s\u01a1 \u0111\u1ed3 m\u1ed9t c\u00e1ch t\u1ef1 \u0111\u1ed9ng. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3m sai s\u00f3t do con ng\u01b0\u1eddi.<\/li>\n<li><strong>H\u1ee3p t\u00e1c v\u1edbi k\u1ef9 s\u01b0 ph\u1ea7n c\u1ee9ng:<\/strong>K\u1ef9 s\u01b0 ph\u1ea7n c\u1ee9ng th\u01b0\u1eddng c\u00f3 quan \u0111i\u1ec3m kh\u00e1c v\u1ec1 c\u00e1c gi\u1edbi h\u1ea1n v\u1ec1 th\u1eddi gian. H\u00e3y ki\u1ec3m tra ch\u00e9o s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n v\u1edbi mong \u0111\u1ee3i c\u1ee7a h\u1ecd.<\/li>\n<li><strong>Gi\u1eef \u0111\u01a1n gi\u1ea3n:<\/strong>\u0110\u1eebng th\u00eam c\u00e1c t\u00edn hi\u1ec7u kh\u00f4ng c\u1ea7n thi\u1ebft. N\u1ebfu m\u1ed9t t\u00edn hi\u1ec7u kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u01b0\u1eddng \u0111i quan tr\u1ecdng, h\u00e3y lo\u1ea1i b\u1ecf n\u00f3 \u0111\u1ec3 gi\u1eef s\u01a1 \u0111\u1ed3 d\u1ec5 \u0111\u1ecdc.<\/li>\n<li><strong>S\u1eed d\u1ee5ng k\u00fd hi\u1ec7u nh\u1ea5t qu\u00e1n:<\/strong>X\u00e1c \u0111\u1ecbnh m\u1ed9t ch\u00fa th\u00edch cho c\u00e1c k\u00fd hi\u1ec7u. S\u1eed d\u1ee5ng c\u00f9ng ki\u1ec3u m\u0169i t\u00ean cho lu\u1ed3ng d\u1eef li\u1ec7u v\u00e0 c\u00f9ng ki\u1ec3u \u0111\u01b0\u1eddng cho t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 trong su\u1ed1t t\u00e0i li\u1ec7u.<\/li>\n<\/ul>\n<h2>\ud83d\udcd0 K\u1ebft lu\u1eadn v\u1ec1 vi\u1ec7c l\u1eadp b\u1ea3n \u0111\u1ed3 th\u1eddi gian<\/h2>\n<p>Vi\u1ec7c t\u1ea1o s\u01a1 \u0111\u1ed3 th\u1eddi gian cho ph\u1ea7n m\u1ec1m nh\u00fang l\u00e0 m\u1ed9t l\u0129nh v\u1ef1c chuy\u00ean m\u00f4n k\u1ebft n\u1ed1i kho\u1ea3ng c\u00e1ch gi\u1eefa logic v\u00e0 v\u1eadt l\u00fd. N\u00f3 \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc v\u1ec1 c\u1ea3 lu\u1ed3ng th\u1ef1c thi m\u00e3 v\u00e0 \u0111\u1eb7c t\u00ednh \u0111i\u1ec7n c\u1ee7a ph\u1ea7n c\u1ee9ng. B\u1eb1ng c\u00e1ch tu\u00e2n theo m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p c\u00f3 c\u1ea5u tr\u00fac\u2014thu th\u1eadp th\u00f4ng s\u1ed1, x\u00e1c \u0111\u1ecbnh t\u00edn hi\u1ec7u, \u0111\u1ecbnh ngh\u0129a c\u00e1c mi\u1ec1n \u0111\u1ed3ng h\u1ed3, l\u1eadp b\u1ea3n \u0111\u1ed3 c\u00e1c chuy\u1ec3n ti\u1ebfp v\u00e0 x\u00e1c minh c\u00e1c r\u00e0ng bu\u1ed9c\u2014b\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t b\u1ea3n \u0111\u1ed3 \u0111\u00e1ng tin c\u1eady v\u1ec1 h\u00e0nh vi c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<p>B\u1ea3n \u0111\u1ed3 n\u00e0y kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t b\u1ee9c tranh; n\u00f3 l\u00e0 c\u00f4ng c\u1ee5 \u0111\u1ec3 x\u00e1c th\u1ef1c, g\u1ee1 l\u1ed7i v\u00e0 giao ti\u1ebfp. N\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng khi b\u1ea1n vi\u1ebft m\u00e3, b\u1ea1n bi\u1ebft ch\u00ednh x\u00e1c c\u00e1ch n\u00f3 s\u1ebd th\u1ec3 hi\u1ec7n trong th\u1ebf gi\u1edbi th\u1ef1c. N\u00f3 ng\u0103n ch\u1eb7n nh\u1eefng l\u1ed7i tinh vi ph\u00e1t sinh t\u1eeb \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh v\u00e0 vi ph\u1ea1m th\u1eddi gian. Trong th\u1ebf gi\u1edbi h\u1ec7 th\u1ed1ng nh\u00fang, \u0111\u1ed9 ch\u00ednh x\u00e1c l\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa m\u1ed9t s\u1ea3n ph\u1ea9m ho\u1ea1t \u0111\u1ed9ng v\u00e0 m\u1ed9t s\u1ea3n ph\u1ea9m th\u1ea5t b\u1ea1i.<\/p>\n<p>D\u00e0nh th\u1eddi gian \u0111\u1ec3 ghi ch\u00e9p v\u1ec1 th\u1eddi gian c\u1ee7a b\u1ea1n. \u0110i\u1ec1u n\u00e0y s\u1ebd ti\u1ebft ki\u1ec7m h\u00e0ng gi\u1edd g\u1ee1 l\u1ed7i sau n\u00e0y. Xem x\u00e9t b\u1ea3n \u0111\u1ed3 th\u1eddi gian nh\u01b0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong t\u00e0i li\u1ec7u thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n, quan tr\u1ecdng nh\u01b0 s\u01a1 \u0111\u1ed3 m\u1ea1ch hay ch\u00ednh m\u00e3 ngu\u1ed3n. V\u1edbi m\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian r\u00f5 r\u00e0ng, b\u1ea1n s\u1ebd t\u1ef1 tin h\u01a1n v\u00e0o ph\u1ea7n m\u1ec1m nh\u00fang c\u1ee7a m\u00ecnh, bi\u1ebft r\u1eb1ng m\u1ecdi chuy\u1ec3n ti\u1ebfp t\u00edn hi\u1ec7u \u0111\u1ec1u \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n v\u00e0 m\u1ecdi kho\u1ea3ng th\u1eddi gian c\u01a1 h\u1ed9i \u0111\u1ec1u \u0111\u01b0\u1ee3c t\u00f4n tr\u1ecdng.<\/p>\n<p>H\u00e3y nh\u1edb r\u1eb1ng c\u00f4ng ngh\u1ec7 ph\u00e1t tri\u1ec3n, nh\u01b0ng nhu c\u1ea7u c\u01a1 b\u1ea3n v\u1ec1 \u0111\u1ed3ng b\u1ed9 h\u00f3a v\u1eabn t\u1ed3n t\u1ea1i. D\u00f9 b\u1ea1n \u0111ang l\u00e0m vi\u1ec7c v\u1edbi h\u1ec7 th\u1ed1ng c\u0169 hay vi \u0111i\u1ec1u khi\u1ec3n th\u1ebf h\u1ec7 m\u1edbi, c\u00e1c nguy\u00ean t\u1eafc ph\u00e2n t\u00edch th\u1eddi gian v\u1eabn nh\u01b0 nhau. \u00c1p d\u1ee5ng c\u00e1c b\u01b0\u1edbc n\u00e0y, duy tr\u00ec c\u00e1c s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n, v\u00e0 \u0111\u1ea3m b\u1ea3o b\u1ea3n \u0111\u1ed3 th\u1eddi gian ph\u1ea7n m\u1ec1m nh\u00fang c\u1ee7a b\u1ea1n v\u1eefng ch\u1eafc nh\u01b0 thi\u1ebft k\u1ebf ph\u1ea7n c\u1ee9ng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m nh\u00fang t\u1ed3n t\u1ea1i \u1edf giao \u0111i\u1ec3m gi\u1eefa logic tr\u1eebu t\u01b0\u1ee3ng v\u00e0 th\u1ef1c t\u1ea1i v\u1eadt l\u00fd. Trong khi m\u00e3 ngu\u1ed3n ch\u1ea1y theo tr\u00ecnh t\u1ef1 logic, ph\u1ea7n c\u1ee9ng ph\u1ea3n \u1ee9ng v\u1edbi m\u1ee9c \u0111i\u1ec7n \u00e1p, chu k\u1ef3 \u0111\u1ed3ng h\u1ed3 v\u00e0 \u0111\u1ed9 tr\u1ec5 lan truy\u1ec1n. Kh\u00f4ng c\u00f3 m\u1ed9t bi\u1ec3u di\u1ec5n tr\u1ef1c quan r\u00f5 r\u00e0ng v\u1ec1 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1537,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[13],"tags":[44,47],"class_list":["post-1536","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-timing-diagram"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>S\u01a1 \u0111\u1ed3 th\u1eddi gian: L\u1eadp b\u1ea3n \u0111\u1ed3 c\u00e1c \u0111\u01b0\u1eddng th\u1eddi gian ph\u1ea7n m\u1ec1m nh\u00fang t\u1eebng b\u01b0\u1edbc m\u1ed9t \u23f1\ufe0f<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch t\u1ea1o s\u01a1 \u0111\u1ed3 th\u1eddi gian ch\u00ednh x\u00e1c cho ph\u1ea7n m\u1ec1m nh\u00fang. 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