{"id":1546,"date":"2026-04-10T10:11:24","date_gmt":"2026-04-10T02:11:24","guid":{"rendered":"https:\/\/mayaharper.showcasingme.net\/vn\/understanding-timing-diagrams-iot-protocols\/"},"modified":"2026-04-10T10:11:24","modified_gmt":"2026-04-10T02:11:24","slug":"understanding-timing-diagrams-iot-protocols","status":"publish","type":"post","link":"https:\/\/mayaharper.showcasingme.net\/vn\/understanding-timing-diagrams-iot-protocols\/","title":{"rendered":"Hi\u1ec3u v\u1ec1 s\u01a1 \u0111\u1ed3 th\u1eddi gian: Logic \u1ea9n gi\u1ea5u \u0111\u1eb1ng sau c\u00e1c giao th\u1ee9c IoT"},"content":{"rendered":"<p>C\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang v\u00e0 thi\u1ebft b\u1ecb Internet v\u1ea1n v\u1eadt (IoT) ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o giao ti\u1ebfp ch\u00ednh x\u00e1c. Kh\u00f4ng c\u00f3 s\u1ef1 hi\u1ec3u bi\u1ebft chung v\u1ec1 th\u1eddi \u0111i\u1ec3m d\u1eef li\u1ec7u \u0111\u1ebfn v\u00e0 th\u1eddi \u0111i\u1ec3m t\u00edn hi\u1ec7u thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i, c\u00e1c thi\u1ebft b\u1ecb s\u1ebd kh\u00f4ng th\u1ec3 giao ti\u1ebfp v\u1edbi nhau m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fac s\u01a1 \u0111\u1ed3 th\u1eddi gian tr\u1edf n\u00ean thi\u1ebft y\u1ebfu. Ch\u00fang \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho giao ti\u1ebfp s\u1ed1, minh h\u1ecda m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c t\u00edn hi\u1ec7u theo th\u1eddi gian. \ud83d\udcc8<\/p>\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1ch \u0111\u1ecdc, di\u1ec5n gi\u1ea3i v\u00e0 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o k\u1ebft n\u1ed1i m\u1ea1nh m\u1ebd gi\u1eefa vi \u0111i\u1ec1u khi\u1ec3n, c\u1ea3m bi\u1ebfn v\u00e0 c\u00e1c module giao ti\u1ebfp. D\u00f9 b\u1ea1n \u0111ang thi\u1ebft k\u1ebf m\u1ed9t s\u1ea3n ph\u1ea9m m\u1edbi hay \u0111ang x\u1eed l\u00fd m\u1ed9t v\u1ea5n \u0111\u1ec1 k\u1ebft n\u1ed1i kh\u00f3 ch\u1ecbu, vi\u1ec7c th\u00e0nh th\u1ea1o c\u00e1c bi\u1ec3u di\u1ec5n h\u00ecnh \u1ea3nh n\u00e0y l\u00e0 \u0111i\u1ec1u then ch\u1ed1t.<\/p>\n<figure class=\"wp-block-image aligncenter\"><img alt=\"Hand-drawn infographic explaining timing diagrams for IoT protocols: visual guide to reading signal waveforms, clock edges, data validity windows, and protocol comparisons for I2C, SPI, and UART with troubleshooting tips and best practices for embedded systems engineers\" decoding=\"async\" src=\"https:\/\/mayaharper.showcasingme.net\/wp-content\/uploads\/2026\/04\/timing-diagrams-iot-protocols-infographic-hand-drawn.jpg\"\/><\/figure>\n<h2>Ch\u00ednh x\u00e1c th\u00ec s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 g\u00ec? \ud83d\udcca<\/h2>\n<p>S\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda v\u1ec1 c\u00e1ch c\u00e1c t\u00edn hi\u1ec7u s\u1ed1 thay \u0111\u1ed5i theo th\u1eddi gian. Kh\u00e1c v\u1edbi s\u01a1 \u0111\u1ed3 logic th\u1ec3 hi\u1ec7n c\u00e1c k\u1ebft n\u1ed1i, s\u01a1 \u0111\u1ed3 th\u1eddi gian t\u1eadp trung v\u00e0o ph\u1ea7n <em>khi<\/em>. Ch\u00fang v\u1ebd c\u00e1c m\u1ee9c \u0111i\u1ec7n \u00e1p (Cao\/Th\u1ea5p) theo tr\u1ee5c th\u1eddi gian, gi\u00fap c\u00e1c k\u1ef9 s\u01b0 h\u00ecnh dung \u0111\u01b0\u1ee3c tr\u00ecnh t\u1ef1 c\u00e1c s\u1ef1 ki\u1ec7n.<\/p>\n<p>Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang v\u00ec logic s\u1ed1 ho\u1ea1t \u0111\u1ed9ng v\u1edbi t\u1ed1c \u0111\u1ed9 c\u1ef1c k\u1ef3 cao. M\u1ed9t \u0111\u1ed9 tr\u1ec5 v\u00e0i nanosecond c\u00f3 th\u1ec3 khi\u1ebfn g\u00f3i d\u1eef li\u1ec7u b\u1ecb h\u1ecfng. B\u1eb1ng c\u00e1ch l\u1eadp b\u1ea3n \u0111\u1ed3 nh\u1eefng kho\u1ea3nh kh\u1eafc n\u00e0y, c\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 x\u00e1c minh r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c th\u00e0nh ph\u1ea7n \u0111\u1ec1u tu\u00e2n th\u1ee7 c\u00e1c th\u00f4ng s\u1ed1 y\u00eau c\u1ea7u.<\/p>\n<ul>\n<li><strong>Tr\u1ee5c th\u1eddi gian:<\/strong> Th\u01b0\u1eddng ch\u1ea1y theo chi\u1ec1u ngang, t\u1eeb tr\u00e1i sang ph\u1ea3i.<\/li>\n<li><strong> C\u00e1c \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u:<\/strong> C\u00e1c \u0111\u01b0\u1eddng ngang \u0111\u1ea1i di\u1ec7n cho t\u1eebng d\u00e2y d\u1eabn ho\u1eb7c m\u1ea1ng l\u01b0\u1edbi.<\/li>\n<li><strong> C\u00e1c m\u1ee9c logic:<\/strong> \u0110i\u1ec7n \u00e1p cao (logic 1) v\u00e0 \u0111i\u1ec7n \u00e1p th\u1ea5p (logic 0).<\/li>\n<li><strong> C\u00e1c chuy\u1ec3n \u0111\u1ed5i:<\/strong> Kho\u1ea3nh kh\u1eafc t\u00edn hi\u1ec7u chuy\u1ec3n t\u1eeb th\u1ea5p sang cao ho\u1eb7c ng\u01b0\u1ee3c l\u1ea1i.<\/li>\n<\/ul>\n<h2>T\u1ea1i sao s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u1ea1i quan tr\u1ecdng trong IoT \ud83c\udf10<\/h2>\n<p>Trong th\u1ebf gi\u1edbi IoT, c\u00e1c thi\u1ebft b\u1ecb th\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng v\u1edbi ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng v\u00e0 kh\u1ea3 n\u0103ng x\u1eed l\u00fd h\u1ea1n ch\u1ebf. Giao ti\u1ebfp hi\u1ec7u qu\u1ea3 kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t ti\u1ec7n nghi; \u0111\u00f3 l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft. S\u01a1 \u0111\u1ed3 th\u1eddi gian gi\u00fap c\u00e1c k\u1ef9 s\u01b0 t\u1ed1i \u01b0u h\u00f3a nh\u1eefng gi\u1edbi h\u1ea1n n\u00e0y.<\/p>\n<h3>1. \u0110\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u \ud83d\udd12<\/h3>\n<p>C\u00e1c m\u1ea1ng IoT th\u01b0\u1eddng truy\u1ec1n d\u1eef li\u1ec7u qua m\u00f4i tr\u01b0\u1eddng nhi\u1ec5u. T\u00e1c \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb (EMI) c\u00f3 th\u1ec3 l\u00e0m \u0111\u1ea3o bit ho\u1eb7c g\u00e2y l\u1ed7i. S\u01a1 \u0111\u1ed3 th\u1eddi gian cho th\u1ea5y li\u1ec7u th\u1eddi gian thi\u1ebft l\u1eadp v\u00e0 th\u1eddi gian gi\u1eef c\u00f3 \u0111\u01b0\u1ee3c \u0111\u00e1p \u1ee9ng hay kh\u00f4ng. N\u1ebfu t\u00edn hi\u1ec7u thay \u0111\u1ed5i qu\u00e1 g\u1ea7n c\u1ea1nh \u0111\u1ed3ng h\u1ed3, thi\u1ebft b\u1ecb nh\u1eadn c\u00f3 th\u1ec3 hi\u1ec3u sai d\u1eef li\u1ec7u. C\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y gi\u00fap x\u00e1c \u0111\u1ecbnh nh\u1eefng kho\u1ea3ng th\u1eddi gian nguy hi\u1ec3m n\u00e0y.<\/p>\n<h3>2. T\u00ednh t\u01b0\u01a1ng th\u00edch giao th\u1ee9c \ud83e\udd1d<\/h3>\n<p>C\u00e1c giao th\u1ee9c kh\u00e1c nhau c\u00f3 nh\u1eefng quy t\u1eafc kh\u00e1c nhau. I2C y\u00eau c\u1ea7u c\u00e1c \u0111i\u1ec1u ki\u1ec7n b\u1eaft \u0111\u1ea7u v\u00e0 k\u1ebft th\u00fac c\u1ee5 th\u1ec3. SPI ph\u1ee5 thu\u1ed9c v\u00e0o c\u1ef1c t\u00ednh v\u00e0 pha c\u1ee7a t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3. Kh\u00f4ng c\u00f3 s\u01a1 \u0111\u1ed3 th\u1eddi gian, r\u1ea5t kh\u00f3 \u0111\u1ec3 x\u00e1c minh xem m\u1ed9t c\u1ea3m bi\u1ebfn c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi mong \u0111\u1ee3i c\u1ee7a vi \u0111i\u1ec1u khi\u1ec3n hay kh\u00f4ng. Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u00f3ng vai tr\u00f2 nh\u01b0 h\u1ee3p \u0111\u1ed3ng gi\u1eefa c\u00e1c th\u00e0nh ph\u1ea7n ph\u1ea7n c\u1ee9ng.<\/p>\n<h3>3. Ch\u1ea9n \u0111o\u00e1n l\u1ed7i giao ti\u1ebfp \ud83d\udd0d<\/h3>\n<p>Khi giao ti\u1ebfp th\u1ea5t b\u1ea1i, \u0111i\u1ec1u n\u00e0y hi\u1ebfm khi x\u1ea3y ra ng\u1eabu nhi\u00ean. Th\u01b0\u1eddng l\u00e0 do vi ph\u1ea1m v\u1ec1 th\u1eddi gian. B\u1eb1ng c\u00e1ch ghi l\u1ea1i c\u00e1c t\u00edn hi\u1ec7u th\u1ef1c t\u1ebf tr\u00ean m\u00e1y hi\u1ec7n s\u00f3ng v\u00e0 ch\u1ed3ng ch\u00fang l\u00ean s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00fd thuy\u1ebft, c\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c n\u01a1i n\u00e0o m\u1ea5t \u0111\u1ed3ng b\u1ed9.<\/p>\n<h2>C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian \u2699\ufe0f<\/h2>\n<p>\u0110\u1ec3 \u0111\u1ecdc nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, ng\u01b0\u1eddi ta ph\u1ea3i hi\u1ec3u r\u00f5 c\u00e1c th\u00e0nh ph\u1ea7n ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e2y d\u1ef1ng ch\u00fang. M\u1ecdi s\u01a1 \u0111\u1ed3, b\u1ea5t k\u1ec3 giao th\u1ee9c n\u00e0o, \u0111\u1ec1u d\u1ef1a tr\u00ean nh\u1eefng kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i n\u00e0y.<\/p>\n<h3>T\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 (CLK) \ud83d\udd70\ufe0f<\/h3>\n<p>Nhi\u1ec1u giao th\u1ee9c IoT l\u00e0 \u0111\u1ed3ng b\u1ed9, ngh\u0129a l\u00e0 ch\u00fang ph\u1ee5 thu\u1ed9c v\u00e0o t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 \u0111\u1ec3 \u0111i\u1ec1u ph\u1ed1i vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u. \u0110\u1ed3ng h\u1ed3 x\u00e1c \u0111\u1ecbnh t\u1ed1c \u0111\u1ed9 giao ti\u1ebfp.<\/p>\n<ul>\n<li><strong>T\u1ea7n s\u1ed1:<\/strong> S\u1ed1 chu k\u1ef3 x\u1ea3y ra m\u1ed7i gi\u00e2y (Hz, kHz, MHz).<\/li>\n<li><strong>Chu k\u1ef3 l\u00e0m vi\u1ec7c:<\/strong> T\u1ef7 l\u1ec7 th\u1eddi gian cao so v\u1edbi chu k\u1ef3 t\u1ed5ng th\u1ec3.<\/li>\n<li><strong>C\u1ea1nh:<\/strong> C\u00e1c t\u00edn hi\u1ec7u th\u01b0\u1eddng k\u00edch ho\u1ea1t \u1edf c\u1ea1nh t\u0103ng (th\u1ea5p sang cao) ho\u1eb7c c\u1ea1nh gi\u1ea3m (cao sang th\u1ea5p).<\/li>\n<\/ul>\n<h3>D\u00e2y d\u1eef li\u1ec7u (SDA, MOSI, TX) \ud83d\udce1<\/h3>\n<p>\u0110\u00e2y l\u00e0 nh\u1eefng d\u00e2y d\u1eabn mang th\u00f4ng tin th\u1ef1c t\u1ebf. Trong s\u01a1 \u0111\u1ed3 th\u1eddi gian, b\u1ea1n s\u1ebd th\u1ea5y c\u00e1c m\u1eabu tr\u1ea1ng th\u00e1i cao v\u00e0 th\u1ea5p \u0111\u1ea1i di\u1ec7n cho c\u00e1c bit nh\u1ecb ph\u00e2n 1 v\u00e0 0.<\/p>\n<h3>T\u00edn hi\u1ec7u \u0111i\u1ec1u khi\u1ec3n (CS, EN, RD, WR) \ud83d\uded1<\/h3>\n<p>C\u00e1c \u0111\u01b0\u1eddng \u0111i\u1ec1u khi\u1ec3n qu\u1ea3n l\u00fd lu\u1ed3ng d\u1eef li\u1ec7u. V\u00ed d\u1ee5, \u0111\u01b0\u1eddng ch\u1ecdn chip (CS) c\u00f3 th\u1ec3 xu\u1ed1ng th\u1ea5p \u0111\u1ec3 k\u00edch ho\u1ea1t m\u1ed9t thi\u1ebft b\u1ecb c\u1ee5 th\u1ec3 tr\u00ean bus chung. \u0110\u01b0\u1eddng \u0111\u1ecdc\/vi\u1ebft (R\/W) th\u00f4ng b\u00e1o cho thi\u1ebft b\u1ecb bi\u1ebft li\u1ec7u n\u00f3 c\u00f3 g\u1eedi d\u1eef li\u1ec7u hay nh\u1eadn d\u1eef li\u1ec7u hay kh\u00f4ng.<\/p>\n<h3>Th\u1eddi gian thi\u1ebft l\u1eadp v\u00e0 gi\u1eef \u23f1\ufe0f<\/h3>\n<p>\u0110\u00e2y l\u00e0 c\u00e1c kho\u1ea3ng an to\u00e0n quan tr\u1ecdng.<strong>Th\u1eddi gian thi\u1ebft l\u1eadp<\/strong> l\u00e0 kho\u1ea3ng th\u1eddi gian tr\u01b0\u1edbc khi c\u1ea1nh \u0111\u1ed3ng h\u1ed3 d\u1eef li\u1ec7u ph\u1ea3i \u1ed5n \u0111\u1ecbnh.<strong>Th\u1eddi gian gi\u1eef<\/strong> l\u00e0 kho\u1ea3ng th\u1eddi gian sau c\u1ea1nh \u0111\u1ed3ng h\u1ed3 d\u1eef li\u1ec7u ph\u1ea3i duy tr\u00ec \u1ed5n \u0111\u1ecbnh. Vi ph\u1ea1m \u0111i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn tr\u1ea1ng th\u00e1i b\u1ea5t \u1ed5n.<\/p>\n<h2>Ph\u00e2n t\u00edch s\u00e2u: C\u00e1c giao th\u1ee9c IoT ph\u1ed5 bi\u1ebfn v\u00e0 th\u1eddi gian c\u1ee7a ch\u00fang \ud83d\udd0c<\/h2>\n<p>C\u00e1c ti\u00eau chu\u1ea9n truy\u1ec1n th\u00f4ng kh\u00e1c nhau c\u00f3 y\u00eau c\u1ea7u th\u1eddi gian ri\u00eang bi\u1ec7t. D\u01b0\u1edbi \u0111\u00e2y, ch\u00fang t\u00f4i ph\u00e2n t\u00edch ba giao th\u1ee9c ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong h\u1ec7 th\u1ed1ng nh\u00fang.<\/p>\n<h3>1. I2C (M\u1ea1ch t\u00edch h\u1ee3p li\u00ean k\u1ebft) \ud83e\udde9<\/h3>\n<p>I2C ph\u1ed5 bi\u1ebfn \u0111\u1ec3 k\u1ebft n\u1ed1i c\u00e1c thi\u1ebft b\u1ecb ngo\u1ea1i vi t\u1ed1c \u0111\u1ed9 th\u1ea5p nh\u01b0 c\u1ea3m bi\u1ebfn. N\u00f3 s\u1eed d\u1ee5ng hai \u0111\u01b0\u1eddng d\u00e2y: SDA (D\u1eef li\u1ec7u) v\u00e0 SCL (\u0110\u1ed3ng h\u1ed3).<\/p>\n<table>\n<tr>\n<th>T\u00ednh n\u0103ng<\/th>\n<th>\u0110\u1eb7c t\u00ednh th\u1eddi gian<\/th>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec1u ki\u1ec7n b\u1eaft \u0111\u1ea7u<\/td>\n<td>SDA chuy\u1ec3n t\u1eeb cao sang th\u1ea5p khi SCL \u1edf m\u1ee9c cao.<\/td>\n<\/tr>\n<tr>\n<td>\u0110i\u1ec1u ki\u1ec7n d\u1eebng<\/td>\n<td>SDA chuy\u1ec3n t\u1eeb th\u1ea5p sang cao khi SCL \u1edf m\u1ee9c cao.<\/td>\n<\/tr>\n<tr>\n<td>T\u00ednh h\u1ee3p l\u1ec7 d\u1eef li\u1ec7u<\/td>\n<td>D\u1eef li\u1ec7u ph\u1ea3i \u1ed5n \u0111\u1ecbnh khi SCL \u1edf m\u1ee9c cao. Thay \u0111\u1ed5i ch\u1ec9 x\u1ea3y ra khi SCL \u1edf m\u1ee9c th\u1ea5p.<\/td>\n<\/tr>\n<tr>\n<td>X\u00e1c nh\u1eadn (ACK)<\/td>\n<td>Thi\u1ebft b\u1ecb nh\u1eadn k\u00e9o SDA xu\u1ed1ng th\u1ea5p trong xung \u0111\u1ed3ng h\u1ed3 th\u1ee9 9.<\/td>\n<\/tr>\n<\/table>\n<p>\u0110i\u1ec1u ki\u1ec7n b\u1eaft \u0111\u1ea7u b\u00e1o hi\u1ec7u s\u1ef1 b\u1eaft \u0111\u1ea7u c\u1ee7a m\u1ed9t giao d\u1ecbch. \u0110i\u1ec1u ki\u1ec7n d\u1eebng b\u00e1o hi\u1ec7u k\u1ebft th\u00fac. Quan tr\u1ecdng nh\u1ea5t, \u0111\u01b0\u1eddng d\u1eef li\u1ec7u ch\u1ec9 \u0111\u01b0\u1ee3c ph\u00e9p thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i khi \u0111\u1ed3ng h\u1ed3 \u1edf m\u1ee9c th\u1ea5p. N\u1ebfu m\u1ed9t thi\u1ebft b\u1ecb thay \u0111\u1ed5i d\u1eef li\u1ec7u khi \u0111\u1ed3ng h\u1ed3 \u1edf m\u1ee9c cao, n\u00f3 s\u1ebd gi\u1ea3 l\u1eadp \u0111i\u1ec1u ki\u1ec7n b\u1eaft \u0111\u1ea7u ho\u1eb7c d\u1eebng, g\u00e2y ra s\u1ef1 nh\u1ea7m l\u1eabn.<\/p>\n<h3>2. SPI (Giao di\u1ec7n ngo\u1ea1i vi n\u1ed1i ti\u1ebfp) \ud83d\ude80<\/h3>\n<p>SPI nhanh h\u01a1n I2C v\u00e0 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c thi\u1ebft b\u1ecb b\u0103ng th\u00f4ng cao nh\u01b0 th\u1ebb SD ho\u1eb7c m\u00e0n h\u00ecnh. Th\u00f4ng th\u01b0\u1eddng, n\u00f3 s\u1eed d\u1ee5ng b\u1ed1n \u0111\u01b0\u1eddng d\u00e2y: MOSI, MISO, SCK v\u00e0 CS.<\/p>\n<ul>\n<li><strong>\u0110\u1ed9 c\u1ef1c c\u1ee7a \u0111\u1ed3ng h\u1ed3 (CPOL):<\/strong>X\u00e1c \u0111\u1ecbnh tr\u1ea1ng th\u00e1i ch\u1edd c\u1ee7a \u0111\u1ed3ng h\u1ed3. N\u00f3 l\u00e0 cao hay th\u1ea5p?<\/li>\n<li><strong>Pha \u0111\u1ed3ng h\u1ed3 (CPHA):<\/strong>X\u00e1c \u0111\u1ecbnh th\u1eddi \u0111i\u1ec3m d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u1ea5y m\u1eabu. \u1ede c\u1ea1nh \u0111\u1ed3ng h\u1ed3 \u0111\u1ea7u ti\u00ean hay th\u1ee9 hai?<\/li>\n<\/ul>\n<p>C\u00f3 b\u1ed1n ch\u1ebf \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng trong SPI, \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a CPOL v\u00e0 CPHA. M\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea3i r\u00f5 r\u00e0ng ch\u1ec9 ra tr\u1ea1ng th\u00e1i ch\u1edd v\u00e0 c\u00e1c c\u1ea1nh ho\u1ea1t \u0111\u1ed9ng. Kh\u00e1c v\u1edbi I2C, SPI kh\u00f4ng c\u00f3 c\u00e1c bit x\u00e1c nh\u1eadn t\u00edch h\u1ee3p; m\u00e1y ch\u1ee7 \u0111\u01a1n gi\u1ea3n l\u00e0 mong \u0111\u1ee3i d\u1eef li\u1ec7u tr\u1edf v\u1ec1.<\/p>\n<h3>3. UART (B\u1ed9 nh\u1eadn ph\u00e1t b\u1ea5t \u0111\u1ed3ng b\u1ed9 ph\u1ed5 d\u1ee5ng) \ud83d\udcdf<\/h3>\n<p>UART l\u00e0 b\u1ea5t \u0111\u1ed3ng b\u1ed9, ngh\u0129a l\u00e0 n\u00f3 kh\u00f4ng s\u1eed d\u1ee5ng \u0111\u1ed3ng h\u1ed3 chung. Thay v\u00e0o \u0111\u00f3, n\u00f3 d\u1ef1a v\u00e0o t\u1ed1c \u0111\u1ed9 truy\u1ec1n (Baud Rate) \u0111\u00e3 th\u1ecfa thu\u1eadn tr\u01b0\u1edbc.<\/p>\n<ul>\n<li><strong>Tr\u1ea1ng th\u00e1i ch\u1edd:<\/strong>Th\u01b0\u1eddng l\u00e0 cao.<\/li>\n<li><strong>Bit b\u1eaft \u0111\u1ea7u:<\/strong>M\u1ed9t chuy\u1ec3n \u0111\u1ed5i t\u1eeb cao sang th\u1ea5p cho th\u1ea5y b\u1eaft \u0111\u1ea7u c\u1ee7a m\u1ed9t byte.<\/li>\n<li><strong>Bit d\u1eebng:<\/strong>M\u1ed9t chuy\u1ec3n \u0111\u1ed5i tr\u1edf l\u1ea1i cao \u0111\u00e1nh d\u1ea5u \u0111i\u1ec3m k\u1ebft th\u00fac.<\/li>\n<\/ul>\n<p>Th\u1eddi gian l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t \u1edf \u0111\u00e2y v\u00ec kh\u00f4ng c\u00f3 \u0111\u1ed3ng h\u1ed3 \u0111\u1ec3 \u0111\u1ed3ng b\u1ed9 hai thi\u1ebft b\u1ecb. N\u1ebfu t\u1ed1c \u0111\u1ed9 truy\u1ec1n sai ngay c\u1ea3 m\u1ed9t ph\u1ea7n tr\u0103m nh\u1ecf, ph\u00eda nh\u1eadn s\u1ebd l\u1ea5y m\u1eabu c\u00e1c bit v\u00e0o th\u1eddi \u0111i\u1ec3m sai, d\u1eabn \u0111\u1ebfn l\u1ed7i. S\u01a1 \u0111\u1ed3 th\u1eddi gian cho th\u1ea5y \u0111\u1ed9 r\u1ed9ng xung c\u1ee7a c\u00e1c bit Start v\u00e0 Stop so v\u1edbi c\u00e1c bit d\u1eef li\u1ec7u.<\/p>\n<h2>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ecdc m\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian t\u1eebng b\u01b0\u1edbc \ud83e\uddd0<\/h2>\n<p>Khi \u0111\u1ed1i m\u1eb7t v\u1edbi m\u1ed9t t\u00e0i li\u1ec7u quy \u0111\u1ecbnh giao th\u1ee9c m\u1edbi, h\u00e3y tu\u00e2n theo ph\u01b0\u01a1ng ph\u00e1p h\u1ec7 th\u1ed1ng n\u00e0y \u0111\u1ec3 gi\u1ea3i m\u00e3 s\u01a1 \u0111\u1ed3 th\u1eddi gian.<\/p>\n<ol>\n<li><strong>X\u00e1c \u0111\u1ecbnh \u0111\u1ed3ng h\u1ed3:<\/strong>T\u00ecm t\u00edn hi\u1ec7u chu k\u1ef3. X\u00e1c \u0111\u1ecbnh t\u1ea7n s\u1ed1 v\u00e0 chu k\u1ef3 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a n\u00f3.<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh c\u00e1c c\u1ea1nh ho\u1ea1t \u0111\u1ed9ng:<\/strong>Nh\u00ecn v\u00e0o c\u00e1c m\u0169i t\u00ean ho\u1eb7c ghi ch\u00fa cho bi\u1ebft c\u1ea1nh n\u00e0o k\u00edch ho\u1ea1t h\u00e0nh \u0111\u1ed9ng. \u0110\u00f3 l\u00e0 c\u1ea1nh t\u0103ng hay gi\u1ea3m?<\/li>\n<li><strong>Ki\u1ec3m tra c\u00e1c kho\u1ea3ng th\u1eddi gian d\u1eef li\u1ec7u h\u1ee3p l\u1ec7:<\/strong>T\u00ecm c\u00e1c v\u00f9ng \u0111\u01b0\u1ee3c t\u00f4 \u0111\u1eadm n\u01a1i d\u1eef li\u1ec7u \u1ed5n \u0111\u1ecbnh. \u0110\u00e2y l\u00e0 n\u01a1i b\u1ed9 nh\u1eadn \u0111\u01b0\u1ee3c ph\u00e9p \u0111\u1ecdc gi\u00e1 tr\u1ecb.<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh c\u00e1c t\u00edn hi\u1ec7u \u0111i\u1ec1u khi\u1ec3n:<\/strong>X\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u01b0\u1eddng Chip Select, Reset ho\u1eb7c Enable. Ghi ch\u00fa khi ch\u00fang chuy\u1ec3n sang tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng so v\u1edbi \u0111\u1ed3ng h\u1ed3.<\/li>\n<li><strong>X\u00e1c minh kho\u1ea3ng an to\u00e0n:<\/strong>Ki\u1ec3m tra c\u00e1c ghi ch\u00fa v\u1ec1 th\u1eddi gian thi\u1ebft l\u1eadp v\u00e0 gi\u1eef. \u0110\u1ea3m b\u1ea3o tri\u1ec3n khai v\u1eadt l\u00fd c\u00f3 th\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u n\u00e0y.<\/li>\n<\/ol>\n<h2>Ch\u1ea9n \u0111o\u00e1n s\u1ef1 c\u1ed1 b\u1eb1ng s\u01a1 \u0111\u1ed3 th\u1eddi gian \ud83d\udee0\ufe0f<\/h2>\n<p>Khi m\u1ed9t h\u1ec7 th\u1ed1ng kh\u00f4ng th\u1ec3 giao ti\u1ebfp, s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 c\u00f4ng c\u1ee5 ch\u1ea9n \u0111o\u00e1n ch\u00ednh c\u1ee7a b\u1ea1n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c ch\u1ebf \u0111\u1ed9 s\u1ef1 c\u1ed1 ph\u1ed5 bi\u1ebfn v\u00e0 c\u00e1ch s\u01a1 \u0111\u1ed3 gi\u00fap x\u00e1c \u0111\u1ecbnh ch\u00fang.<\/p>\n<h3>1. T\u1eaft \u0111i\u1ec7n v\u00e0 nhi\u1ec5u \u26a1<\/h3>\n<p>Nh\u1eefng \u0111\u1ec9nh ng\u1eafn tr\u00ean \u0111\u01b0\u1eddng t\u00edn hi\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 c\u00e1c c\u1ea1nh h\u1ee3p l\u1ec7. S\u01a1 \u0111\u1ed3 th\u1eddi gian gi\u00fap ph\u00e2n bi\u1ec7t gi\u1eefa m\u1ed9t chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u th\u1ef1c s\u1ef1 v\u00e0 nhi\u1ec5u \u0111i\u1ec7n. N\u1ebfu xung ng\u1eafn h\u01a1n gi\u1edbi h\u1ea1n t\u1ed1i thi\u1ec3u, th\u00ec r\u1ea5t c\u00f3 th\u1ec3 \u0111\u00f3 l\u00e0 nhi\u1ec5u.<\/p>\n<h3>2. Sai l\u1ec7ch \u0111\u1ed3ng h\u1ed3 \ud83c\udfc1<\/h3>\n<p>Sai l\u1ec7ch \u0111\u1ed3ng h\u1ed3 x\u1ea3y ra khi t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 \u0111\u1ebfn c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c nhau v\u00e0o c\u00e1c th\u1eddi \u0111i\u1ec3m kh\u00e1c nhau. Trong s\u01a1 \u0111\u1ed3 th\u1eddi gian, \u0111i\u1ec1u n\u00e0y tr\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ed9t s\u1ef1 d\u1ecbch chuy\u1ec3n c\u1ee7a c\u1ea1nh \u0111\u1ed3ng h\u1ed3 so v\u1edbi c\u1ea1nh d\u1eef li\u1ec7u. N\u1ebfu sai l\u1ec7ch v\u01b0\u1ee3t qu\u00e1 ng\u00e2n s\u00e1ch th\u1eddi gian, h\u1ec7 th\u1ed1ng s\u1ebd th\u1ea5t b\u1ea1i.<\/p>\n<h3>3. Kh\u00f4ng kh\u1edbp t\u1ed1c \u0111\u1ed9 baud (UART) \ud83d\udcc9<\/h3>\n<p>N\u1ebfu b\u1ed9 ph\u00e1t v\u00e0 b\u1ed9 nh\u1eadn kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u1ed3ng b\u1ed9 ho\u00e0n h\u1ea3o, c\u00e1c \u0111i\u1ec3m l\u1ea5y m\u1eabu s\u1ebd tr\u00f4i d\u1ea1t. Theo th\u1eddi gian, b\u1ed9 nh\u1eadn c\u00f3 th\u1ec3 l\u1ea5y m\u1eabu bit ti\u1ebfp theo thay v\u00ec bit hi\u1ec7n t\u1ea1i. S\u01a1 \u0111\u1ed3 th\u1eddi gian minh h\u1ecda s\u1ef1 tr\u00f4i d\u1ea1t n\u00e0y, cho th\u1ea5y s\u1ef1 t\u00edch l\u0169y c\u00e1c bit l\u1ed7i.<\/p>\n<h3>4. V\u1ea5n \u0111\u1ec1 \u0111i\u1ec7n tr\u1edf k\u00e9o l\u00ean (I2C) \ud83e\uddf1<\/h3>\n<p>C\u00e1c \u0111\u01b0\u1eddng I2C l\u00e0 ki\u1ec3u m\u1edf-drain v\u00e0 c\u1ea7n \u0111i\u1ec7n tr\u1edf k\u00e9o l\u00ean. N\u1ebfu \u0111i\u1ec7n tr\u1edf qu\u00e1 cao, t\u00edn hi\u1ec7u s\u1ebd t\u0103ng ch\u1eadm. S\u01a1 \u0111\u1ed3 th\u1eddi gian s\u1ebd cho th\u1ea5y th\u1eddi gian t\u0103ng ch\u1eadm, c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u00edn hi\u1ec7u kh\u00f4ng \u0111\u1ea1t ng\u01b0\u1ee1ng cao tr\u01b0\u1edbc khi c\u1ea1nh \u0111\u1ed3ng h\u1ed3 \u0111\u1ebfn.<\/p>\n<h2>C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t \u0111\u1ec3 thi\u1ebft k\u1ebf c\u00e1c t\u00edn hi\u1ec7u \u0111\u00e1ng tin c\u1eady \ud83d\udcdd<\/h2>\n<p>Thi\u1ebft k\u1ebf \u0111\u1ec3 th\u00e0nh c\u00f4ng v\u1ec1 m\u1eb7t th\u1eddi gian \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00fa \u00fd \u0111\u1ebfn chi ti\u1ebft t\u1eeb giai \u0111o\u1ea1n s\u01a1 \u0111\u1ed3 m\u1ea1ch \u0111\u1ebfn b\u1ed1 tr\u00ed b\u1ea3ng m\u1ea1ch in. Tu\u00e2n theo c\u00e1c h\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u1ec3 gi\u1ea3m thi\u1ec3u c\u00e1c v\u1ea5n \u0111\u1ec1.<\/p>\n<ul>\n<li><strong>\u0110i\u1ec1u ch\u1ec9nh \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng d\u1eabn:<\/strong> \u0110\u1ed1i v\u1edbi c\u00e1c bus song song, gi\u1eef \u0111\u1ed9 d\u00e0i c\u00e1c \u0111\u01b0\u1eddng d\u1eabn b\u1eb1ng nhau \u0111\u1ec3 tr\u00e1nh sai l\u1ec7ch. \u0110\u1ed1i v\u1edbi c\u00e1c bus n\u1ed1i ti\u1ebfp, \u0111\u1ea3m b\u1ea3o \u0111\u01b0\u1eddng d\u1eabn \u0111\u1ed3ng h\u1ed3 s\u1ea1ch s\u1ebd.<\/li>\n<li><strong>Qu\u1ea3n l\u00fd tr\u1edf kh\u00e1ng:<\/strong> S\u1eed d\u1ee5ng c\u00e1c \u0111\u01b0\u1eddng d\u1eabn c\u00f3 tr\u1edf kh\u00e1ng \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t \u0111\u1ec3 ng\u0103n ph\u1ea3n x\u1ea1 t\u00edn hi\u1ec7u, \u0111i\u1ec1u n\u00e0y l\u00e0m m\u00e9o m\u00f3 th\u1eddi gian.<\/li>\n<li><strong>T\u1ee5 \u0111i\u1ec7n t\u00e1ch ngu\u1ed3n:<\/strong> \u0110\u1eb7t t\u1ee5 \u0111i\u1ec7n g\u1ea7n ch\u00e2n ngu\u1ed3n \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111i\u1ec7n \u00e1p \u1ed5n \u0111\u1ecbnh trong qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i, t\u1eeb \u0111\u00f3 ng\u0103n ng\u1eeba hi\u1ec7n t\u01b0\u1ee3ng r\u01a1 nhi\u1ec5u th\u1eddi gian.<\/li>\n<li><strong>T\u00f4n tr\u1ecdng th\u1eddi gian t\u0103ng:<\/strong> \u0110\u1ea3m b\u1ea3o b\u1ed9 \u0111i\u1ec1u khi\u1ec3n c\u00f3 th\u1ec3 chuy\u1ec3n \u0111\u1ed5i \u0111\u1ee7 nhanh \u0111\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u th\u1eddi gian t\u0103ng\/gi\u1ea3m t\u1ed1i thi\u1ec3u c\u1ee7a giao th\u1ee9c.<\/li>\n<li><strong>S\u1eed d\u1ee5ng m\u1eb7t \u0111\u1ea5t (ground plane):<\/strong> M\u1ed9t m\u1eb7t \u0111\u1ea5t li\u1ec1n m\u1ea1ch gi\u1ea3m nhi\u1ec5u v\u00e0 cung c\u1ea5p tham chi\u1ebfu \u1ed5n \u0111\u1ecbnh cho c\u00e1c m\u1ee9c \u0111i\u1ec7n \u00e1p.<\/li>\n<\/ul>\n<h2>C\u00e1c c\u00e2n nh\u1eafc n\u00e2ng cao: \u0110\u1ed9 tr\u1ec5 v\u00e0 b\u0103ng th\u00f4ng \ud83d\ude80<\/h2>\n<p>S\u01a1 \u0111\u1ed3 th\u1eddi gian kh\u00f4ng ch\u1ec9 li\u00ean quan \u0111\u1ebfn \u0111\u1ed9 ch\u00ednh x\u00e1c; ch\u00fang li\u00ean quan \u0111\u1ebfn hi\u1ec7u su\u1ea5t. Hi\u1ec3u r\u00f5 v\u1ec1 th\u1eddi gian cho ph\u00e9p b\u1ea1n t\u00ednh to\u00e1n \u0111\u1ed9 tr\u1ec5 v\u00e0 b\u0103ng th\u00f4ng.<\/p>\n<h3>T\u00ednh to\u00e1n b\u0103ng th\u00f4ng<\/h3>\n<p>B\u1eb1ng c\u00e1ch ph\u00e2n t\u00edch t\u1ea7n s\u1ed1 \u0111\u1ed3ng h\u1ed3 v\u00e0 s\u1ed1 bit m\u1ed7i chu k\u1ef3 trong s\u01a1 \u0111\u1ed3, b\u1ea1n c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u t\u1ed1i \u0111a. V\u00ed d\u1ee5, n\u1ebfu \u0111\u1ed3ng h\u1ed3 ch\u1ea1y \u1edf 1 MHz v\u00e0 m\u1ed9t bit \u0111\u01b0\u1ee3c g\u1eedi m\u1ed7i chu k\u1ef3, b\u0103ng th\u00f4ng l\u00e0 1 Mbps.<\/p>\n<h3>T\u1ed1i thi\u1ec3u h\u00f3a \u0111\u1ed9 tr\u1ec5<\/h3>\n<p>\u0110\u1ed9 tr\u1ec5 l\u00e0 kho\u1ea3ng th\u1eddi gian t\u1eeb khi d\u1eef li\u1ec7u s\u1eb5n s\u00e0ng \u0111\u1ebfn khi n\u00f3 \u0111\u01b0\u1ee3c nh\u1eadn. S\u01a1 \u0111\u1ed3 th\u1eddi gian cho th\u1ea5y c\u00e1c kho\u1ea3ng th\u1eddi gian ch\u1edd gi\u1eefa c\u00e1c giao d\u1ecbch. Gi\u1ea3m thi\u1ec3u c\u00e1c kho\u1ea3ng th\u1eddi gian ch\u1edd n\u00e0y (v\u00ed d\u1ee5: b\u1eb1ng c\u00e1ch t\u1ed1i \u01b0u h\u00f3a \u0111i\u1ec1u ki\u1ec7n Start\/Stop trong I2C) c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 nh\u1ea1y c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<h2>Vai tr\u00f2 c\u1ee7a b\u1ed9 ph\u00e2n t\u00edch logic \ud83d\udd2c<\/h2>\n<p>Trong khi s\u01a1 \u0111\u1ed3 th\u1eddi gian mang t\u00ednh l\u00fd thuy\u1ebft, c\u00e1c b\u1ed9 ph\u00e2n t\u00edch logic cung c\u1ea5p d\u1eef li\u1ec7u th\u1ef1c nghi\u1ec7m. C\u00e1c c\u00f4ng c\u1ee5 n\u00e0y ghi l\u1ea1i c\u00e1c m\u1ee9c \u0111i\u1ec7n \u00e1p th\u1ef1c t\u1ebf tr\u00ean nhi\u1ec1u k\u00eanh \u0111\u1ed3ng th\u1eddi v\u00e0 hi\u1ec3n th\u1ecb ch\u00fang d\u01b0\u1edbi d\u1ea1ng s\u01a1 \u0111\u1ed3 th\u1eddi gian.<\/p>\n<p>Khi g\u1ee1 l\u1ed7i, b\u1ea1n thu th\u1eadp t\u00edn hi\u1ec7u, sau \u0111\u00f3 so s\u00e1nh d\u1ea1ng s\u00f3ng \u0111\u00e3 thu \u0111\u01b0\u1ee3c v\u1edbi s\u01a1 \u0111\u1ed3 quy \u0111\u1ecbnh. B\u1ea5t k\u1ef3 s\u1ef1 l\u1ec7ch n\u00e0o c\u0169ng l\u00e0 m\u1ed9t manh m\u1ed1i. C\u00e1c c\u00f4ng c\u1ee5 hi\u1ec7n \u0111\u1ea1i cho ph\u00e9p b\u1ea1n gi\u1ea3i m\u00e3 d\u1eef li\u1ec7u nh\u1ecb ph\u00e2n th\u00e0nh ASCII ho\u1eb7c Hex, gi\u00fap ph\u00e2n t\u00edch nhanh h\u01a1n nhi\u1ec1u.<\/p>\n<h2>K\u1ebft lu\u1eadn: C\u1ed1t l\u00f5i c\u1ee7a giao ti\u1ebfp nh\u00fang \ud83d\udd17<\/h2>\n<p>S\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 ng\u00f4n ng\u1eef im l\u1eb7ng c\u1ee7a \u0111i\u1ec7n t\u1eed. Ch\u00fang kh\u00f4ng g\u00e0o th\u00e9t, nh\u01b0ng l\u1ea1i quy \u0111\u1ecbnh c\u00e1c quy t\u1eafc t\u01b0\u01a1ng t\u00e1c cho m\u1ecdi giao ti\u1ebfp s\u1ed1. \u0110\u1ed1i v\u1edbi c\u00e1c k\u1ef9 s\u01b0 IoT, vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y kh\u00f4ng ph\u1ea3i l\u00e0 t\u00f9y ch\u1ecdn; \u0111\u00f3 l\u00e0 \u0111i\u1ec1u c\u0103n b\u1ea3n.<\/p>\n<p>B\u1eb1ng c\u00e1ch th\u00e0nh th\u1ea1o logic tr\u1ef1c quan c\u1ee7a c\u00e1c c\u1ea1nh \u0111\u1ed3ng h\u1ed3, c\u00e1c kho\u1ea3ng th\u1eddi gian h\u1ee3p l\u1ec7 c\u1ee7a d\u1eef li\u1ec7u v\u00e0 c\u00e1c t\u00edn hi\u1ec7u \u0111i\u1ec1u khi\u1ec3n, b\u1ea1n \u0111\u1ea3m b\u1ea3o thi\u1ebft b\u1ecb c\u1ee7a m\u00ecnh giao ti\u1ebfp m\u1ed9t c\u00e1ch \u0111\u00e1ng tin c\u1eady trong th\u1ebf gi\u1edbi th\u1ef1c. D\u00f9 \u0111ang x\u1eed l\u00fd c\u00e1c gi\u1edbi h\u1ea1n t\u1ed1c \u0111\u1ed9 th\u1ea5p c\u1ee7a I2C hay c\u00e1c y\u00eau c\u1ea7u t\u1ed1c \u0111\u1ed9 cao c\u1ee7a SPI, s\u01a1 \u0111\u1ed3 th\u1eddi gian v\u1eabn l\u00e0 s\u1ef1 th\u1eadt b\u1ea5t bi\u1ebfn.<\/p>\n<p>Khi c\u00f4ng ngh\u1ec7 ph\u00e1t tri\u1ec3n, c\u00e1c giao th\u1ee9c m\u1edbi s\u1ebd xu\u1ea5t hi\u1ec7n v\u1edbi y\u00eau c\u1ea7u th\u1eddi gian kh\u1eaft khe h\u01a1n. Kh\u1ea3 n\u0103ng \u0111\u1ecdc v\u00e0 hi\u1ec3u c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y s\u1ebd lu\u00f4n l\u00e0 n\u0103ng l\u1ef1c c\u1ed1t l\u00f5i \u0111\u1ed1i v\u1edbi b\u1ea5t k\u1ef3 ai x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng k\u1ebft n\u1ed1i. T\u1eadp trung v\u00e0o c\u00e1c t\u00edn hi\u1ec7u, t\u00f4n tr\u1ecdng th\u1eddi gian, v\u00e0 thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n s\u1ebd th\u00e0nh c\u00f4ng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang v\u00e0 thi\u1ebft b\u1ecb Internet v\u1ea1n v\u1eadt (IoT) ph\u1ee5 thu\u1ed9c r\u1ea5t nhi\u1ec1u v\u00e0o giao ti\u1ebfp ch\u00ednh x\u00e1c. Kh\u00f4ng c\u00f3 s\u1ef1 hi\u1ec3u bi\u1ebft chung v\u1ec1 th\u1eddi \u0111i\u1ec3m d\u1eef li\u1ec7u \u0111\u1ebfn v\u00e0 th\u1eddi \u0111i\u1ec3m t\u00edn hi\u1ec7u thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i, c\u00e1c thi\u1ebft b\u1ecb s\u1ebd kh\u00f4ng th\u1ec3 giao ti\u1ebfp v\u1edbi nhau m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1547,"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-1546","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>Hi\u1ec3u v\u1ec1 S\u01a1 \u0111\u1ed3 Th\u1eddi gian: Logic Giao th\u1ee9c IoT \u2699\ufe0f<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch \u0111\u1ecdc s\u01a1 \u0111\u1ed3 th\u1eddi gian cho c\u00e1c giao th\u1ee9c IoT nh\u01b0 I2C, SPI v\u00e0 UART. 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