{"id":1564,"date":"2026-04-08T10:28:42","date_gmt":"2026-04-08T02:28:42","guid":{"rendered":"https:\/\/mayaharper.showcasingme.net\/vn\/timing-diagrams-simplified-embedded-newbies\/"},"modified":"2026-04-08T10:28:42","modified_gmt":"2026-04-08T02:28:42","slug":"timing-diagrams-simplified-embedded-newbies","status":"publish","type":"post","link":"https:\/\/mayaharper.showcasingme.net\/vn\/timing-diagrams-simplified-embedded-newbies\/","title":{"rendered":"S\u01a1 \u0111\u1ed3 Th\u1eddi gian \u0110\u01b0\u1ee3c \u0110\u01a1n Gi\u1ea3n H\u00f3a: Gi\u1edbi thi\u1ec7u Kh\u00f4ng Chuy\u00ean m\u00f4n cho Ng\u01b0\u1eddi M\u1edbi B\u1eaft \u0110\u1ea7u Nh\u00fang"},"content":{"rendered":"<p>Hi\u1ec3u c\u00e1ch c\u00e1c th\u00e0nh ph\u1ea7n \u0111i\u1ec7n t\u1eed giao ti\u1ebfp v\u1edbi nhau l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng n\u1ec1n t\u1ea3ng trong k\u1ef9 thu\u1eadt h\u1ec7 th\u1ed1ng nh\u00fang. M\u1ed9t trong nh\u1eefng c\u00f4ng c\u1ee5 quan tr\u1ecdng nh\u1ea5t \u0111\u1ec3 tr\u1ef1c quan h\u00f3a s\u1ef1 giao ti\u1ebfp n\u00e0y l\u00e0 s\u01a1 \u0111\u1ed3 th\u1eddi gian. Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y m\u00f4 t\u1ea3 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c t\u00edn hi\u1ec7u theo th\u1eddi gian, \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho c\u00e1ch d\u1eef li\u1ec7u di chuy\u1ec3n qua m\u1ea1ch. \u0110\u1ed1i v\u1edbi ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u, c\u00e1c d\u1ea1ng s\u00f3ng n\u00e0y c\u00f3 th\u1ec3 tr\u00f4ng nh\u01b0 m\u1ed9t m\u1edb h\u1ed7n \u0111\u1ed9n c\u00e1c \u0111\u01b0\u1eddng n\u00e9t. Tuy nhi\u00ean, m\u1ed9t khi b\u1ea1n hi\u1ec3u \u0111\u01b0\u1ee3c logic c\u1ed1t l\u00f5i, ch\u00fang tr\u1edf th\u00e0nh c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd \u0111\u1ec3 g\u1ee1 l\u1ed7i v\u00e0 thi\u1ebft k\u1ebf ph\u1ea7n c\u1ee9ng. H\u01b0\u1edbng d\u1eabn n\u00e0y chia nh\u1ecf s\u01a1 \u0111\u1ed3 th\u1eddi gian th\u00e0nh c\u00e1c kh\u00e1i ni\u1ec7m d\u1ec5 ti\u1ebfp c\u1eadn, s\u1eed d\u1ee5ng ng\u00f4n ng\u1eef r\u00f5 r\u00e0ng v\u00e0 c\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf.<\/p>\n<figure class=\"wp-block-image aligncenter\"><img alt=\"Cute kawaii vector infographic explaining timing diagrams for embedded systems beginners, featuring pastel-colored waveforms, logic levels, clock signals, setup\/hold time zones, and simplified comparisons of I2C, SPI, and UART protocols with friendly character illustrations and rounded vector art style\" decoding=\"async\" src=\"https:\/\/mayaharper.showcasingme.net\/wp-content\/uploads\/2026\/04\/kawaii-timing-diagrams-embedded-systems-infographic.jpg\"\/><\/figure>\n<h2>Ch\u00ednh x\u00e1c th\u00ec s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 g\u00ec? \u2699\ufe0f<\/h2>\n<p>S\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 m\u1ed9t bi\u1ec3u di\u1ec5n \u0111\u1ed3 h\u1ecda v\u1ec1 m\u1ed1i quan h\u1ec7 gi\u1eefa hai ho\u1eb7c nhi\u1ec1u t\u00edn hi\u1ec7u theo th\u1eddi gian. Trong c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang, t\u00edn hi\u1ec7u l\u00e0 c\u00e1c xung \u0111i\u1ec7n bi\u1ec3u th\u1ecb th\u00f4ng tin. Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y cho th\u1ea5y khi n\u00e0o m\u1ed9t t\u00edn hi\u1ec7u thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i (t\u1eeb th\u1ea5p l\u00ean cao ho\u1eb7c ng\u01b0\u1ee3c l\u1ea1i) so v\u1edbi c\u00e1c t\u00edn hi\u1ec7u kh\u00e1c.<\/p>\n<p>H\u00e3y h\u00ecnh dung n\u00f3 nh\u01b0 b\u1ea3n nh\u1ea1c c\u1ee7a m\u1ed9t b\u1ea3n nh\u1ea1c. C\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1ee9ng \u0111\u1ea1i di\u1ec7n cho c\u00e1c nh\u1ea1c c\u1ee5 (t\u00edn hi\u1ec7u), v\u00e0 tr\u1ee5c ho\u00e0nh \u0111\u1ea1i di\u1ec7n cho th\u1eddi gian. T\u01b0\u01a1ng t\u1ef1 nh\u01b0 ng\u01b0\u1eddi nh\u1ea1c s\u0129 c\u1ea7n bi\u1ebft khi n\u00e0o ph\u1ea3i ch\u01a1i n\u1ed1t nh\u1ea1c \u0111\u1ec3 h\u00f2a h\u1ee3p v\u1edbi ban nh\u1ea1c, k\u1ef9 s\u01b0 c\u0169ng c\u1ea7n bi\u1ebft ch\u00ednh x\u00e1c khi n\u00e0o g\u1eedi ho\u1eb7c \u0111\u1ecdc d\u1eef li\u1ec7u \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang.<\/p>\n<ul>\n<li><strong>Tr\u1ee5c \u0111\u1ee9ng:<\/strong>\u0110\u1ea1i di\u1ec7n cho c\u00e1c t\u00edn hi\u1ec7u (v\u00ed d\u1ee5: \u0110\u1ed3ng h\u1ed3, D\u1eef li\u1ec7u, K\u00edch ho\u1ea1t).<\/li>\n<li><strong>Tr\u1ee5c ngang:<\/strong>\u0110\u1ea1i di\u1ec7n cho s\u1ef1 ti\u1ebfn tri\u1ec3n theo th\u1eddi gian.<\/li>\n<li><strong>D\u1ea1ng s\u00f3ng:<\/strong>C\u00e1c \u0111\u01b0\u1eddng bi\u1ec3u th\u1ecb m\u1ee9c \u0111i\u1ec7n \u00e1p c\u1ee7a t\u1eebng t\u00edn hi\u1ec7u.<\/li>\n<\/ul>\n<p>Kh\u00f4ng c\u00f3 nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y, vi\u1ec7c g\u1ee1 l\u1ed7i giao ti\u1ebfp ph\u1ea7n c\u1ee9ng s\u1ebd gi\u1ed1ng nh\u01b0 c\u1ed1 g\u1eafng s\u1eeda \u0111\u1ed9ng c\u01a1 xe h\u01a1i ch\u1ec9 b\u1eb1ng c\u00e1ch nghe ti\u1ebfng \u1ed3n m\u00e0 kh\u00f4ng nh\u00ecn th\u1ea5y c\u00e1c b\u1ed9 ph\u1eadn b\u00ean trong. Ch\u00fang cung c\u1ea5p b\u1ea3n ghi tr\u1ef1c quan v\u1ec1 nh\u1eefng s\u1ef1 ki\u1ec7n x\u1ea3y ra qu\u00e1 nhanh \u0111\u1ec3 m\u1eaft th\u01b0\u1eddng c\u00f3 th\u1ec3 quan s\u00e1t tr\u1ef1c ti\u1ebfp.<\/p>\n<h2>Ng\u00f4n ng\u1eef c\u1ee7a T\u00edn hi\u1ec7u: \u0110i\u1ec7n \u00e1p v\u00e0 Logic \u26a1<\/h2>\n<p>Tr\u01b0\u1edbc khi \u0111\u1ecdc s\u01a1 \u0111\u1ed3, b\u1ea1n ph\u1ea3i hi\u1ec3u \u00fd ngh\u0129a c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng th\u1eb3ng. Trong \u0111i\u1ec7n t\u1eed s\u1ed1, th\u00f4ng tin \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a b\u1eb1ng c\u00e1c m\u1ee9c \u0111i\u1ec7n \u00e1p.<\/p>\n<h3>M\u1ee9c Logic<\/h3>\n<ul>\n<li><strong>M\u1ee9c Cao Logic (1):<\/strong>Th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng \u0111i\u1ec7n \u00e1p cao h\u01a1n (v\u00ed d\u1ee5: 3,3V ho\u1eb7c 5V).<\/li>\n<li><strong>M\u1ee9c Th\u1ea5p Logic (0):<\/strong>Th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng \u0111i\u1ec7n \u00e1p th\u1ea5p h\u01a1n (v\u00ed d\u1ee5: 0V ho\u1eb7c Mass).<\/li>\n<\/ul>\n<p>Quan tr\u1ecdng c\u1ea7n l\u01b0u \u00fd l\u00e0 ng\u01b0\u1ee1ng \u0111i\u1ec7n \u00e1p c\u1ee5 th\u1ec3 c\u00f3 th\u1ec3 kh\u00e1c nhau gi\u1eefa c\u00e1c chip kh\u00e1c nhau. M\u1ed9t s\u1ed1 chip c\u00f3 th\u1ec3 coi 2,5V l\u00e0 m\u1ee9c cao, trong khi nh\u1eefng chip kh\u00e1c l\u1ea1i c\u1ea7n 3,0V. S\u01a1 \u0111\u1ed3 th\u1eddi gian tr\u1eebu t\u01b0\u1ee3ng h\u00f3a \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1ch hi\u1ec3n th\u1ecb c\u00e1c tr\u1ea1ng th\u00e1i nh\u1ecb ph\u00e2n, nh\u01b0ng th\u1ef1c t\u1ebf v\u1eadt l\u00fd l\u1ea1i li\u00ean quan \u0111\u1ebfn c\u00e1c d\u1ea3i \u0111i\u1ec7n \u00e1p.<\/p>\n<h3>Ho\u1ea1t \u0111\u1ed9ng Cao so v\u1edbi Ho\u1ea1t \u0111\u1ed9ng Th\u1ea5p<\/h3>\n<p>M\u1ed9t s\u1ed1 t\u00edn hi\u1ec7u ho\u1ea1t \u0111\u1ed9ng khi \u1edf m\u1ee9c cao, trong khi m\u1ed9t s\u1ed1 kh\u00e1c ho\u1ea1t \u0111\u1ed9ng khi \u1edf m\u1ee9c th\u1ea5p. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng m\u1ed9t h\u00ecnh tr\u00f2n nh\u1ecf (bong b\u00f3ng) \u1edf \u0111\u1ea7u t\u00ean t\u00edn hi\u1ec7u tr\u00ean s\u01a1 \u0111\u1ed3.<\/p>\n<ul>\n<li><strong>Ho\u1ea1t \u0111\u1ed9ng Cao:<\/strong>Ch\u1ee9c n\u0103ng x\u1ea3y ra khi t\u00edn hi\u1ec7u \u1edf m\u1ee9c cao nh\u1ea5t.<\/li>\n<li><strong>Ho\u1ea1t \u0111\u1ed9ng Th\u1ea5p:<\/strong>Ch\u1ee9c n\u0103ng x\u1ea3y ra khi t\u00edn hi\u1ec7u \u1edf m\u1ee9c th\u1ea5p nh\u1ea5t. \u0110i\u1ec1u n\u00e0y ph\u1ed5 bi\u1ebfn v\u1edbi t\u00edn hi\u1ec7u kh\u1edfi \u0111\u1ed9ng l\u1ea1i ho\u1eb7c ch\u1ecdn chip.<\/li>\n<\/ul>\n<h2>C\u00e1c Th\u00e0nh ph\u1ea7n Ch\u00ednh \u0110\u01b0\u1ee3c Gi\u1ea3i Th\u00edch \ud83e\udde9<\/h2>\n<p>\u0110\u1ec3 \u0111\u1ecdc s\u01a1 \u0111\u1ed3 th\u1eddi gian hi\u1ec7u qu\u1ea3, b\u1ea1n c\u1ea7n nh\u1eadn di\u1ec7n c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ee5 th\u1ec3 trong d\u1ea1ng s\u00f3ng.<\/p>\n<h3>C\u1ea1nh<\/h3>\n<p>C\u1ea1nh l\u00e0 c\u00e1c chuy\u1ec3n ti\u1ebfp khi t\u00edn hi\u1ec7u di chuy\u1ec3n t\u1eeb m\u1ed9t m\u1ee9c sang m\u1ee9c kh\u00e1c.<\/p>\n<ul>\n<li><strong>C\u1ea1nh t\u0103ng:<\/strong>T\u00edn hi\u1ec7u chuy\u1ec3n t\u1eeb th\u1ea5p sang cao. Th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 k\u00edch ho\u1ea1t m\u1ed9t h\u00e0nh \u0111\u1ed9ng.<\/li>\n<li><strong>C\u1ea1nh gi\u1ea3m:<\/strong>T\u00edn hi\u1ec7u chuy\u1ec3n t\u1eeb cao sang th\u1ea5p. C\u0169ng \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 k\u00edch ho\u1ea1t.<\/li>\n<\/ul>\n<h3>Chu k\u1ef3 v\u00e0 T\u1ea7n s\u1ed1<\/h3>\n<p>T\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 l\u00e0 nh\u1ecbp \u0111\u1eadp c\u1ee7a h\u1ec7 th\u1ed1ng. Th\u1eddi gian \u0111\u1ec3 ho\u00e0n th\u00e0nh m\u1ed9t chu k\u1ef3 \u0111\u1ea7y \u0111\u1ee7 (cao + th\u1ea5p) \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 chu k\u1ef3. Ngh\u1ecbch \u0111\u1ea3o c\u1ee7a chu k\u1ef3 l\u00e0 t\u1ea7n s\u1ed1, \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng Hertz (Hz).<\/p>\n<h3>\u0110\u1ed9 tr\u1ec5<\/h3>\n<p>Kh\u00f4ng c\u00f3 t\u00edn hi\u1ec7u n\u00e0o di chuy\u1ec3n ngay l\u1eadp t\u1ee9c. Lu\u00f4n t\u1ed3n t\u1ea1i m\u1ed9t kho\u1ea3ng tr\u1ec5 nh\u1ecf gi\u1eefa l\u00fac l\u1ec7nh \u0111\u01b0\u1ee3c g\u1eedi v\u00e0 l\u00fac \u0111\u01b0\u1ee3c nh\u1eadn. C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian hi\u1ec3n th\u1ecb r\u00f5 kho\u1ea3ng tr\u1ed1ng n\u00e0y, th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u l\u00e0<code>t_pd<\/code> (\u0111\u1ed9 tr\u1ec5 lan truy\u1ec1n).<\/p>\n<h2>\u0110\u1ecdc c\u00e1c c\u1ea1nh: \u0110\u1ed3ng b\u1ed9 h\u00f3a \ud83d\udd52<\/h2>\n<p>Trong truy\u1ec1n th\u00f4ng s\u1ed1, th\u1eddi \u0111i\u1ec3m d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u1ea5y m\u1eabu l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t. C\u00f3 hai ph\u01b0\u01a1ng ph\u00e1p ch\u00ednh \u0111\u1ec3 \u0111\u1ed3ng b\u1ed9 h\u00f3a:<\/p>\n<h3>Giao ti\u1ebfp \u0111\u1ed3ng b\u1ed9<\/h3>\n<p>Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y s\u1eed d\u1ee5ng m\u1ed9t t\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 ri\u00eang \u0111\u1ec3 \u0111i\u1ec1u ph\u1ed1i vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u. Ng\u01b0\u1eddi g\u1eedi v\u00e0 ng\u01b0\u1eddi nh\u1eadn \u0111\u1ec1u tu\u00e2n theo c\u00f9ng m\u1ed9t nh\u1ecbp \u0111\u1ed3ng h\u1ed3.<\/p>\n<ul>\n<li><strong>V\u00ed d\u1ee5:<\/strong> SPI (Giao di\u1ec7n ngo\u1ea1i vi n\u1ed1i ti\u1ebfp).<\/li>\n<li><strong>L\u1ee3i \u00edch:<\/strong>Th\u1eddi gian ch\u00ednh x\u00e1c v\u00e0 t\u1ed1c \u0111\u1ed9 cao h\u01a1n.<\/li>\n<li><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong>Y\u00eau c\u1ea7u nhi\u1ec1u d\u00e2y h\u01a1n (\u00edt nh\u1ea5t ba d\u00e2y: D\u1eef li\u1ec7u, \u0110\u1ed3ng h\u1ed3, Ch\u1ecdn chip).<\/li>\n<\/ul>\n<h3>Giao ti\u1ebfp b\u1ea5t \u0111\u1ed3ng b\u1ed9<\/h3>\n<p>Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y kh\u00f4ng s\u1eed d\u1ee5ng \u0111\u1ed3ng h\u1ed3 chung. Thay v\u00e0o \u0111\u00f3, c\u1ea3 hai thi\u1ebft b\u1ecb \u0111\u1ec1u th\u1ed1ng nh\u1ea5t t\u1ed1c \u0111\u1ed9 tr\u01b0\u1edbc (t\u1ed1c \u0111\u1ed9 truy\u1ec1n, hay baud rate), v\u00e0 c\u00e1c bit b\u1eaft \u0111\u1ea7u\/k\u1ebft th\u00fac \u0111\u00e1nh d\u1ea5u \u0111i\u1ec3m b\u1eaft \u0111\u1ea7u v\u00e0 k\u1ebft th\u00fac c\u1ee7a m\u1ed9t byte.<\/p>\n<ul>\n<li><strong>V\u00ed d\u1ee5:<\/strong> UART (B\u1ed9 nh\u1eadn ph\u00e1t b\u1ea5t \u0111\u1ed3ng b\u1ed9 ph\u1ed5 d\u1ee5ng).<\/li>\n<li><strong>L\u1ee3i \u00edch:<\/strong>C\u1ea7n \u00edt d\u00e2y h\u01a1n (th\u01b0\u1eddng ch\u1ec9 c\u1ea7n hai d\u00e2y).<\/li>\n<li><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong>Ph\u1ee9c t\u1ea1p h\u01a1n m\u1ed9t ch\u00fat trong vi\u1ec7c x\u1eed l\u00fd l\u1ed7i n\u1ebfu \u0111\u1ed3ng h\u1ed3 b\u1ecb tr\u00f4i.<\/li>\n<\/ul>\n<h2>C\u00e1c giao th\u1ee9c truy\u1ec1n th\u00f4ng ph\u1ed5 bi\u1ebfn \ud83d\udce1<\/h2>\n<p>S\u01a1 \u0111\u1ed3 th\u1eddi gian th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 \u0111\u1ecbnh ngh\u0129a v\u00e0 g\u1ee1 l\u1ed7i c\u00e1c giao th\u1ee9c truy\u1ec1n th\u00f4ng ti\u00eau chu\u1ea9n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ph\u00e2n t\u00edch ba giao th\u1ee9c ph\u1ed5 bi\u1ebfn nh\u1ea5t.<\/p>\n<h3>1. I2C (V\u00f2ng giao ti\u1ebfp gi\u1eefa c\u00e1c vi m\u1ea1ch)<\/h3>\n<p>I2C l\u00e0 m\u1ed9t giao th\u1ee9c 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 v\u1edbi vi \u0111i\u1ec1u khi\u1ec3n. N\u00f3 s\u1eed d\u1ee5ng hai d\u00e2y: SDA (D\u1eef li\u1ec7u) v\u00e0 SCL (\u0110\u1ed3ng h\u1ed3).<\/p>\n<table>\n<thead>\n<tr>\n<th>S\u1ef1 ki\u1ec7n<\/th>\n<th>H\u00e0nh vi t\u00edn hi\u1ec7u<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u0110i\u1ec1u ki\u1ec7n b\u1eaft \u0111\u1ea7u<\/strong><\/td>\n<td>SDA chuy\u1ec3n t\u1eeb cao xu\u1ed1ng th\u1ea5p trong khi SCL \u1edf m\u1ee9c cao.<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110i\u1ec1u ki\u1ec7n d\u1eebng<\/strong><\/td>\n<td>SDA chuy\u1ec3n t\u1eeb th\u1ea5p l\u00ean cao trong khi SCL \u1edf m\u1ee9c cao.<\/td>\n<\/tr>\n<tr>\n<td><strong>Ghi<\/strong><\/td>\n<td>SDA \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n b\u1edfi thi\u1ebft b\u1ecb ch\u1ee7 (Master).<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ecdc<\/strong><\/td>\n<td>SDA \u0111\u01b0\u1ee3c \u0111i\u1ec1u khi\u1ec3n b\u1edfi thi\u1ebft b\u1ecb ph\u1ee5 (Slave).<\/td>\n<\/tr>\n<tr>\n<td><strong>X\u00e1c nh\u1eadn<\/strong><\/td>\n<td>Thi\u1ebft b\u1ecb nh\u1eadn k\u00e9o SDA xu\u1ed1ng th\u1ea5p trong su\u1ed1t xung \u0111\u1ed3ng h\u1ed3.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>L\u01b0u \u00fd r\u1eb1ng \u0111\u01b0\u1eddng d\u1eef li\u1ec7u (SDA) ph\u1ea3i duy tr\u00ec \u1ed5n \u0111\u1ecbnh trong khi \u0111\u01b0\u1eddng \u0111\u1ed3ng h\u1ed3 (SCL) \u1edf m\u1ee9c cao. N\u1ebfu SDA thay \u0111\u1ed5i khi SCL \u1edf m\u1ee9c cao, h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 hi\u1ec3u nh\u1ea7m n\u00f3 l\u00e0 \u0111i\u1ec1u ki\u1ec7n B\u1eaft \u0111\u1ea7u ho\u1eb7c D\u1eebng.<\/p>\n<h3>2. SPI (Giao di\u1ec7n ngo\u1ea1i vi n\u1ed1i ti\u1ebfp)<\/h3>\n<p>SPI nhanh h\u01a1n I2C v\u00e0 s\u1eed d\u1ee5ng b\u1ed1n t\u00edn hi\u1ec7u ch\u00ednh: MOSI (Ch\u1ee7 ra, ph\u1ee5 v\u00e0o), MISO (Ch\u1ee7 v\u00e0o, ph\u1ee5 ra), SCK (\u0110\u1ed3ng h\u1ed3), v\u00e0 CS (Ch\u1ecdn chip).<\/p>\n<ul>\n<li><strong>Ch\u1ecdn chip:<\/strong>Ph\u1ea3i \u1edf m\u1ee9c th\u1ea5p \u0111\u1ec3 k\u00edch ho\u1ea1t thi\u1ebft b\u1ecb.<\/li>\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 l\u00e0 cao hay th\u1ea5p.<\/li>\n<li><strong>Giai \u0111o\u1ea1n \u0111\u1ed3ng h\u1ed3 (CPHA):<\/strong>X\u00e1c \u0111\u1ecbnh d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u1ea5y m\u1eabu \u1edf c\u1ea1nh l\u00ean hay c\u1ea1nh xu\u1ed1ng.<\/li>\n<\/ul>\n<p>Khi \u0111\u1ecdc s\u01a1 \u0111\u1ed3 th\u1eddi gian SPI, h\u00e3y t\u00ecm t\u00edn hi\u1ec7u Chip Select chuy\u1ec3n xu\u1ed1ng th\u1ea5p. Vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u ch\u1ec9 x\u1ea3y ra khi Chip Select \u0111ang ho\u1ea1t \u0111\u1ed9ng. T\u00edn hi\u1ec7u \u0111\u1ed3ng h\u1ed3 quy \u0111\u1ecbnh t\u1ed1c \u0111\u1ed9 c\u00e1c bit d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c d\u1ecbch ra.<\/p>\n<h3>3. UART (B\u1ed9 nh\u1eadn ph\u00e1t b\u1ea5t \u0111\u1ed3ng b\u1ed9 ph\u1ed5 d\u1ee5ng)<\/h3>\n<p>UART l\u00e0 giao th\u1ee9c n\u1ed1i ti\u1ebfp \u0111\u01a1n gi\u1ea3n nh\u1ea5t. N\u00f3 g\u1eedi d\u1eef li\u1ec7u t\u1eebng byte m\u1ed9t m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ed3ng h\u1ed3.<\/p>\n<ul>\n<li><strong>Tr\u1ea1ng th\u00e1i ch\u1edd:<\/strong>D\u00e2y duy tr\u00ec \u1edf m\u1ee9c cao.<\/li>\n<li><strong>Bit b\u1eaft \u0111\u1ea7u:<\/strong>M\u1ed9t xung th\u1ea5p \u0111\u01a1n l\u1ebb cho bi\u1ebft b\u1eaft \u0111\u1ea7u d\u1eef li\u1ec7u.<\/li>\n<li><strong>C\u00e1c bit d\u1eef li\u1ec7u:<\/strong>8 bit th\u01b0\u1eddng xuy\u00ean, \u0111\u01b0\u1ee3c g\u1eedi theo th\u1ee9 t\u1ef1 bit c\u00f3 \u00fd ngh\u0129a th\u1ea5p nh\u1ea5t tr\u01b0\u1edbc.<\/li>\n<li><strong>Bit d\u1eebng:<\/strong>Tr\u1ea3 v\u1ec1 tr\u1ea1ng th\u00e1i cao \u0111\u1ec3 b\u00e1o hi\u1ec7u k\u1ebft th\u00fac.<\/li>\n<\/ul>\n<p>C\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian cho UART t\u1eadp trung m\u1ea1nh v\u00e0o \u0111\u1ed9 d\u00e0i c\u1ee7a bit b\u1eaft \u0111\u1ea7u. V\u00ec kh\u00f4ng c\u00f3 \u0111\u1ed3ng h\u1ed3, b\u1ed9 nh\u1eadn ph\u1ea3i d\u1ef1a v\u00e0o th\u1eddi gian ch\u00ednh x\u00e1c c\u1ee7a xung b\u1eaft \u0111\u1ea7u \u0111\u1ec3 bi\u1ebft khi n\u00e0o l\u1ea5y m\u1eabu c\u00e1c bit ti\u1ebfp theo.<\/p>\n<h2>Gi\u1edbi h\u1ea1n th\u1eddi gian: Th\u1eddi gian thi\u1ebft l\u1eadp v\u00e0 th\u1eddi gian gi\u1eef \u23f3<\/h2>\n<p>M\u1ed9t trong nh\u1eefng kh\u00eda c\u1ea1nh quan tr\u1ecdng nh\u1ea5t c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian li\u00ean quan \u0111\u1ebfn m\u1ed1i quan h\u1ec7 gi\u1eefa d\u1eef li\u1ec7u v\u00e0 \u0111\u1ed3ng h\u1ed3. C\u00e1c vi m\u1ea1ch c\u00f3 gi\u1edbi h\u1ea1n v\u1eadt l\u00fd v\u1ec1 t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd t\u00edn hi\u1ec7u. Nh\u1eefng gi\u1edbi h\u1ea1n n\u00e0y \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi th\u1eddi gian thi\u1ebft l\u1eadp v\u00e0 th\u1eddi gian gi\u1eef.<\/p>\n<h3>Th\u1eddi gian thi\u1ebft l\u1eadp<\/h3>\n<p>Th\u1eddi gian thi\u1ebft l\u1eadp l\u00e0 kho\u1ea3ng th\u1eddi gian t\u1ed1i thi\u1ec3u m\u00e0 t\u00edn hi\u1ec7u d\u1eef li\u1ec7u ph\u1ea3i \u1ed5n \u0111\u1ecbnh<em>tr\u01b0\u1edbc<\/em>khi c\u1ea1nh \u0111\u1ed3ng h\u1ed3 \u0111\u1ebfn. N\u1ebfu d\u1eef li\u1ec7u thay \u0111\u1ed5i qu\u00e1 g\u1ea7n c\u1ea1nh \u0111\u1ed3ng h\u1ed3, chip nh\u1eadn c\u00f3 th\u1ec3 kh\u00f4ng ghi nh\u1eadn gi\u00e1 tr\u1ecb \u0111\u00fang.<\/p>\n<h3>Th\u1eddi gian gi\u1eef<\/h3>\n<p>Th\u1eddi gian gi\u1eef l\u00e0 kho\u1ea3ng th\u1eddi gian t\u1ed1i thi\u1ec3u m\u00e0 t\u00edn hi\u1ec7u d\u1eef li\u1ec7u ph\u1ea3i duy tr\u00ec \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh<em>sau<\/em>khi c\u1ea1nh \u0111\u1ed3ng h\u1ed3 \u0111\u00e3 qua. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o t\u00edn hi\u1ec7u \u0111\u00e3 \u1ed5n \u0111\u1ecbnh \u0111\u1ee7 \u0111\u1ec3 \u0111\u01b0\u1ee3c ghi v\u00e0o t\u1ebf b\u00e0o nh\u1edb.<\/p>\n<h3>\u0110\u1ed9 tr\u1ec5 lan truy\u1ec1n<\/h3>\n<p>\u0110\u00e2y l\u00e0 kho\u1ea3ng th\u1eddi gian \u0111\u1ec3 m\u1ed9t t\u00edn hi\u1ec7u \u0111i t\u1eeb \u0111\u1ea7u v\u00e0o c\u1ee7a m\u1ed9t th\u00e0nh ph\u1ea7n \u0111\u1ebfn \u0111\u1ea7u ra c\u1ee7a n\u00f3. Trong s\u01a1 \u0111\u1ed3 th\u1eddi gian, b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y m\u1ed9t kho\u1ea3ng tr\u1ed1ng gi\u1eefa c\u1ea1nh \u0111\u1ed3ng h\u1ed3 v\u00e0 \u0111\u1ea7u ra d\u1eef li\u1ec7u. Kho\u1ea3ng tr\u1ed1ng n\u00e0y ch\u00ednh l\u00e0 \u0111\u1ed9 tr\u1ec5 lan truy\u1ec1n.<\/p>\n<table>\n<thead>\n<tr>\n<th>Gi\u1edbi h\u1ea1n<\/th>\n<th>\u0110\u1ecbnh ngh\u0129a<\/th>\n<th>Ch\u1ebf \u0111\u1ed9 l\u1ed7i<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Th\u1eddi gian thi\u1ebft l\u1eadp<\/strong><\/td>\n<td>D\u1eef li\u1ec7u \u1ed5n \u0111\u1ecbnh tr\u01b0\u1edbc c\u1ea1nh \u0111\u1ed3ng h\u1ed3.<\/td>\n<td>T\u00ecnh tr\u1ea1ng b\u1ea5t \u1ed5n ho\u1eb7c ghi nh\u1eadn sai.<\/td>\n<\/tr>\n<tr>\n<td><strong>Th\u1eddi gian gi\u1eef<\/strong><\/td>\n<td>D\u1eef li\u1ec7u \u1ed5n \u0111\u1ecbnh sau c\u1ea1nh \u0111\u1ed3ng h\u1ed3.<\/td>\n<td>S\u1ef1 nh\u1ea3y v\u1ecdt ho\u1eb7c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh.<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ed9 tr\u1ec5 lan truy\u1ec1n<\/strong><\/td>\n<td>Th\u1eddi gian \u0111\u1ec3 t\u00edn hi\u1ec7u di chuy\u1ec3n.<\/td>\n<td>T\u1ed1c \u0111\u1ed9 h\u1ec7 th\u1ed1ng t\u1ed5ng th\u1ec3 ch\u1eadm l\u1ea1i.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 ph\u00e2n t\u00edch m\u1ed9t s\u01a1 \u0111\u1ed3 t\u1eebng b\u01b0\u1edbc \ud83d\udcdd<\/h2>\n<p>Khi b\u1ea1n g\u1eb7p m\u1ed9t s\u01a1 \u0111\u1ed3 th\u1eddi gian m\u1edbi, h\u00e3y tu\u00e2n theo ph\u01b0\u01a1ng ph\u00e1p h\u1ec7 th\u1ed1ng n\u00e0y \u0111\u1ec3 tr\u00e1nh nh\u1ea7m l\u1eabn.<\/p>\n<ol>\n<li><strong>X\u00e1c \u0111\u1ecbnh c\u00e1c t\u00edn hi\u1ec7u:<\/strong>H\u00e3y nh\u00ecn v\u00e0o c\u00e1c nh\u00e3n \u1edf b\u00ean tr\u00e1i. Nh\u1eefng n\u00e0o l\u00e0 \u0111\u1ea7u v\u00e0o, \u0111\u1ea7u ra ho\u1eb7c \u0111\u01b0\u1eddng \u0111i\u1ec1u khi\u1ec3n?<\/li>\n<li><strong>T\u00ecm \u0111\u1ed3ng h\u1ed3:<\/strong>X\u00e1c \u0111\u1ecbnh t\u00edn hi\u1ec7u chu k\u1ef3. \u0110i\u1ec1u n\u00e0y x\u00e1c \u0111\u1ecbnh nh\u1ecbp \u0111\u1ed9.<\/li>\n<li><strong>X\u00e1c \u0111\u1ecbnh m\u1ee9c ho\u1ea1t \u0111\u1ed9ng:<\/strong>Ki\u1ec3m tra c\u00e1c h\u00ecnh tr\u00f2n nh\u1ecf ho\u1eb7c v\u0103n b\u1ea3n cho bi\u1ebft m\u1ee9c cao hay th\u1ea5p l\u00e0 tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng.<\/li>\n<li><strong>Theo d\u00f5i tr\u00ecnh t\u1ef1:<\/strong>Theo d\u00f5i theo d\u00f2ng th\u1eddi gian t\u1eeb tr\u00e1i sang ph\u1ea3i. T\u00ecm c\u00e1c \u0111i\u1ec1u ki\u1ec7n B\u1eaft \u0111\u1ea7u, truy\u1ec1n d\u1eef li\u1ec7u v\u00e0 \u0111i\u1ec1u ki\u1ec7n K\u1ebft th\u00fac.<\/li>\n<li><strong>Ki\u1ec3m tra kho\u1ea3ng tr\u1ed1ng:<\/strong>H\u00e3y t\u00ecm c\u00e1c y\u00eau c\u1ea7u th\u1eddi gian thi\u1ebft l\u1eadp v\u00e0 gi\u1eef. \u0110\u1ea3m b\u1ea3o c\u00e1c \u0111\u01b0\u1eddng d\u1eef li\u1ec7u \u1ed5n \u0111\u1ecbnh trong kho\u1ea3ng th\u1eddi gian quan tr\u1ecdng.<\/li>\n<li><strong>T\u00ecm c\u00e1c b\u1ea5t th\u01b0\u1eddng:<\/strong>C\u00f3 hi\u1ec7n t\u01b0\u1ee3ng nh\u1ea3y v\u1ecdt kh\u00f4ng? C\u00e1c xung c\u00f3 ng\u1eafn h\u01a1n quy \u0111\u1ecbnh kh\u00f4ng? Nh\u1eefng \u0111i\u1ec1u n\u00e0y cho th\u1ea5y c\u00f3 th\u1ec3 c\u00f3 l\u1ed7i ph\u1ea7n c\u1ee9ng.<\/li>\n<\/ol>\n<h2>Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ee7a ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u \ud83d\udeab<\/h2>\n<p>Ngay c\u1ea3 c\u00e1c k\u1ef9 s\u01b0 c\u00f3 kinh nghi\u1ec7m c\u0169ng c\u00f3 th\u1ec3 b\u1ecf s\u00f3t chi ti\u1ebft. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng l\u1ed7i th\u01b0\u1eddng g\u1eb7p c\u1ea7n tr\u00e1nh.<\/p>\n<ul>\n<li><strong>B\u1ecf qua m\u1ee9c \u0111i\u1ec7n \u00e1p:<\/strong>Gi\u1ea3 \u0111\u1ecbnh logic 3.3V ho\u1ea1t \u0111\u1ed9ng v\u1edbi thi\u1ebft b\u1ecb 5V m\u00e0 kh\u00f4ng c\u00f3 b\u1ed9 chuy\u1ec3n m\u1ee9c c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng linh ki\u1ec7n.<\/li>\n<li><strong>\u0110\u1ecdc nh\u1ea7m c\u1ea1nh:<\/strong>Nh\u1ea7m l\u1eabn gi\u1eefa c\u1ea1nh l\u00ean v\u00e0 c\u1ea1nh xu\u1ed1ng c\u00f3 th\u1ec3 \u0111\u1ea3o ng\u01b0\u1ee3c logic truy\u1ec1n d\u1eef li\u1ec7u.<\/li>\n<li><strong>B\u1ecf qua m\u1ee9c ho\u1ea1t \u0111\u1ed9ng th\u1ea5p:<\/strong>Gi\u1ea3 \u0111\u1ecbnh m\u1ed9t t\u00edn hi\u1ec7u ho\u1ea1t \u0111\u1ed9ng cao khi th\u1ef1c t\u1ebf l\u00e0 ho\u1ea1t \u0111\u1ed9ng th\u1ea5p c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn thi\u1ebft b\u1ecb kh\u00f4ng bao gi\u1edd b\u1eadt.<\/li>\n<li><strong>B\u1ecf qua kho\u1ea3ng an to\u00e0n v\u1ec1 th\u1eddi gian:<\/strong>Thi\u1ebft k\u1ebf \u0111\u00fang ngay gi\u1edbi h\u1ea1n c\u1ee7a r\u00e0ng bu\u1ed9c m\u00e0 kh\u00f4ng c\u00f3 kho\u1ea3ng tr\u1ed1ng cho sai s\u00f3t c\u00f3 th\u1ec3 khi\u1ebfn h\u1ec7 th\u1ed1ng th\u1ea5t b\u1ea1i khi nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i ho\u1eb7c \u0111i\u1ec7n \u00e1p gi\u1ea3m.<\/li>\n<\/ul>\n<h2>C\u00e1c c\u00f4ng c\u1ee5 tr\u1ef1c quan h\u00f3a \ud83d\udee0\ufe0f<\/h2>\n<p>M\u1eb7c d\u00f9 b\u1ea1n c\u00f3 th\u1ec3 v\u1ebd c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y tr\u00ean gi\u1ea5y, nh\u01b0ng vi\u1ec7c g\u1ee1 l\u1ed7i th\u1ef1c t\u1ebf \u0111\u00f2i h\u1ecfi c\u00e1c c\u00f4ng c\u1ee5 thu th\u1eadp t\u00edn hi\u1ec7u \u0111i\u1ec7n th\u1ef1c t\u1ebf.<\/p>\n<h3>M\u00e1y hi\u1ec7n s\u00f3ng<\/h3>\n<p>M\u00e1y hi\u1ec7n s\u00f3ng hi\u1ec3n th\u1ecb \u0111i\u1ec7n \u00e1p theo th\u1eddi gian. \u0110\u00e2y l\u00e0 c\u00e1ch tr\u1ef1c ti\u1ebfp nh\u1ea5t \u0111\u1ec3 xem s\u01a1 \u0111\u1ed3 th\u1eddi gian trong th\u1ef1c t\u1ebf. B\u1ea1n n\u1ed1i \u0111\u1ea7u d\u00f2 v\u00e0o d\u00e2y d\u1eabn v\u00e0 quan s\u00e1t c\u00e1c d\u1ea1ng s\u00f3ng xu\u1ea5t hi\u1ec7n tr\u00ean m\u00e0n h\u00ecnh.<\/p>\n<h3>B\u1ed9 ph\u00e2n t\u00edch logic<\/h3>\n<p>B\u1ed9 ph\u00e2n t\u00edch logic \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ri\u00eang cho c\u00e1c t\u00edn hi\u1ec7u s\u1ed1. N\u00f3 thu th\u1eadp \u0111\u1ed3ng th\u1eddi nhi\u1ec1u k\u00eanh t\u00edn hi\u1ec7u s\u1ed1 v\u00e0 chuy\u1ec3n \u0111\u1ed5i ch\u00fang th\u00e0nh h\u00ecnh \u1ea3nh s\u01a1 \u0111\u1ed3 th\u1eddi gian r\u00f5 r\u00e0ng. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng d\u1ec5 \u0111\u1ecdc h\u01a1n so v\u1edbi c\u00e1c dao \u0111\u1ed9ng t\u01b0\u01a1ng t\u1ef1 c\u1ee7a m\u00e1y hi\u1ec7n s\u00f3ng.<\/p>\n<h3>Ph\u1ea7n m\u1ec1m m\u00f4 ph\u1ecfng<\/h3>\n<p>Tr\u01b0\u1edbc khi x\u00e2y d\u1ef1ng ph\u1ea7n c\u1ee9ng, c\u00e1c k\u1ef9 s\u01b0 th\u01b0\u1eddng m\u00f4 ph\u1ecfng m\u1ea1ch \u0111i\u1ec7n. Nh\u1eefng c\u00f4ng c\u1ee5 n\u00e0y t\u1ef1 \u0111\u1ed9ng t\u1ea1o s\u01a1 \u0111\u1ed3 th\u1eddi gian d\u1ef1a tr\u00ean m\u00e3 ngu\u1ed3n v\u00e0 thi\u1ebft k\u1ebf m\u1ea1ch \u0111i\u1ec7n. \u0110i\u1ec1u n\u00e0y gi\u00fap b\u1ea1n ph\u00e1t hi\u1ec7n l\u1ed7i tr\u01b0\u1edbc khi h\u00e0n b\u1ea5t k\u1ef3 linh ki\u1ec7n n\u00e0o.<\/p>\n<h2>B\u00e0i t\u1eadp th\u1ef1c h\u00e0nh \u0111\u1ec3 x\u00e2y d\u1ef1ng s\u1ef1 t\u1ef1 tin \ud83e\udde0<\/h2>\n<p>C\u00e1ch h\u1ecdc t\u1ed1t nh\u1ea5t l\u00e0 th\u1ef1c h\u00e0nh. H\u00e3y th\u1eed nh\u1eefng b\u00e0i t\u1eadp n\u00e0y \u0111\u1ec3 c\u1ee7ng c\u1ed1 hi\u1ec3u bi\u1ebft c\u1ee7a b\u1ea1n.<\/p>\n<ul>\n<li><strong>B\u00e0i t\u1eadp 1:<\/strong>T\u00ecm m\u1ed9t t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt cho m\u1ed9t c\u1ea3m bi\u1ebfn th\u00f4ng d\u1ee5ng (nh\u01b0 gia t\u1ed1c k\u1ebf). X\u00e1c \u0111\u1ecbnh s\u01a1 \u0111\u1ed3 th\u1eddi gian cho giao di\u1ec7n v\u00e0 c\u1ed1 g\u1eafng v\u1ebd l\u1ea1i t\u1eeb tr\u00ed nh\u1edb.<\/li>\n<li><strong>B\u00e0i t\u1eadp 2:<\/strong>S\u1eed d\u1ee5ng m\u00e1y ph\u00e2n t\u00edch logic \u0111\u1ec3 ghi l\u1ea1i m\u1ed9t giao d\u1ecbch SPI \u0111\u01a1n gi\u1ea3n. So s\u00e1nh d\u1ea1ng s\u00f3ng \u0111\u00e3 ghi \u0111\u01b0\u1ee3c v\u1edbi s\u01a1 \u0111\u1ed3 trong t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt.<\/li>\n<li><strong>B\u00e0i t\u1eadp 3:<\/strong>T\u00ednh t\u1ea7n s\u1ed1 t\u1ed1i \u0111a cho m\u1ed9t h\u1ec7 th\u1ed1ng d\u1ef1a tr\u00ean th\u1eddi gian thi\u1ebft l\u1eadp c\u1ee5 th\u1ec3 v\u00e0 \u0111\u1ed9 tr\u1ec5 lan truy\u1ec1n.<\/li>\n<li><strong>B\u00e0i t\u1eadp 4:<\/strong>V\u1ebd s\u01a1 \u0111\u1ed3 th\u1eddi gian cho thao t\u00e1c Ghi I2C \u0111\u1ebfn m\u1ed9t \u0111\u1ecba ch\u1ec9 thanh ghi c\u1ee5 th\u1ec3.<\/li>\n<\/ul>\n<h2>Hi\u1ec3u v\u1ec1 m\u00e3 h\u00f3a d\u1eef li\u1ec7u \ud83d\udcca<\/h2>\n<p>C\u00e1c t\u00edn hi\u1ec7u kh\u00f4ng ch\u1ec9 mang c\u00e1c gi\u00e1 tr\u1ecb 1 v\u00e0 0; ch\u00fang mang \u00fd ngh\u0129a. C\u00e1ch c\u00e1c bit \u0111\u01b0\u1ee3c nh\u00f3m l\u1ea1i l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng.<\/p>\n<h3>MSB so v\u1edbi LSB \u0111\u1ea7u ti\u00ean<\/h3>\n<p>Khi g\u1eedi m\u1ed9t byte, b\u1ea1n c\u00f3 g\u1eedi bit c\u00f3 tr\u1ecdng s\u1ed1 cao nh\u1ea5t tr\u01b0\u1edbc hay bit c\u00f3 tr\u1ecdng s\u1ed1 th\u1ea5p nh\u1ea5t tr\u01b0\u1edbc? \u0110\u00e2y l\u00e0 m\u1ed9t c\u00e0i \u0111\u1eb7t c\u1ea5u h\u00ecnh ph\u1ed5 bi\u1ebfn. S\u01a1 \u0111\u1ed3 th\u1eddi gian s\u1ebd hi\u1ec3n th\u1ecb r\u00f5 r\u00e0ng th\u1ee9 t\u1ef1 c\u00e1c bit. N\u1ebfu b\u1ea1n mong \u0111\u1ee3i MSB \u0111\u01b0\u1ee3c g\u1eedi tr\u01b0\u1edbc nh\u01b0ng s\u01a1 \u0111\u1ed3 l\u1ea1i hi\u1ec3n th\u1ecb LSB tr\u01b0\u1edbc, d\u1eef li\u1ec7u c\u1ee7a b\u1ea1n s\u1ebd b\u1ecb hi\u1ec3u sai.<\/p>\n<h3>Ch\u1eb5n l\u1ebb v\u00e0 ki\u1ec3m tra l\u1ed7i<\/h3>\n<p>M\u1ed9t s\u1ed1 giao th\u1ee9c th\u00eam c\u00e1c bit b\u1ed5 sung \u0111\u1ec3 ki\u1ec3m tra l\u1ed7i. M\u1ed9t bit ch\u1eb5n l\u1ebb c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c th\u00eam v\u00e0o \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u1ed1 l\u01b0\u1ee3ng bit 1 l\u00e0 ch\u1eb5n ho\u1eb7c l\u1ebb. S\u01a1 \u0111\u1ed3 th\u1eddi gian s\u1ebd hi\u1ec3n th\u1ecb c\u00e1c bit b\u1ed5 sung n\u00e0y \u0111i theo sau d\u1eef li\u1ec7u ch\u00ednh.<\/p>\n<h2>X\u1eed l\u00fd nhi\u1ec5u v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng nh\u1ea3y t\u00edn hi\u1ec7u \ud83c\udf2a\ufe0f<\/h2>\n<p>Trong th\u1ebf gi\u1edbi th\u1ef1c, c\u00e1c t\u00edn hi\u1ec7u ch\u01b0a bao gi\u1edd ho\u00e0n h\u1ea3o. T\u00e1c \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb c\u00f3 th\u1ec3 g\u00e2y ra c\u00e1c \u0111\u1ec9nh \u0111i\u1ec7n \u00e1p ho\u1eb7c s\u1ee5t gi\u1ea3m. Nh\u1eefng hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 nh\u1ea3y t\u00edn hi\u1ec7u.<\/p>\n<p>S\u01a1 \u0111\u1ed3 th\u1eddi gian gi\u00fap x\u00e1c \u0111\u1ecbnh nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y. N\u1ebfu b\u1ea1n th\u1ea5y m\u1ed9t \u0111\u1ec9nh tr\u00ean \u0111\u01b0\u1eddng d\u1eef li\u1ec7u m\u00e0 l\u1ebd ra kh\u00f4ng n\u00ean c\u00f3, \u0111i\u1ec1u \u0111\u00f3 cho th\u1ea5y c\u00f3 nhi\u1ec5u. N\u1ebfu m\u1ed9t xung qu\u00e1 h\u1eb9p, chip c\u00f3 th\u1ec3 kh\u00f4ng nh\u1eadn di\u1ec7n n\u00f3 l\u00e0 t\u00edn hi\u1ec7u h\u1ee3p l\u1ec7.<\/p>\n<h3>Chi\u1ebfn l\u01b0\u1ee3c l\u1ecdc t\u00edn hi\u1ec7u<\/h3>\n<ul>\n<li><strong>L\u1ecdc b\u1eb1ng ph\u1ea7n c\u1ee9ng:<\/strong>Th\u00eam t\u1ee5 \u0111i\u1ec7n \u0111\u1ec3 l\u00e0m m\u1ecbn c\u00e1c \u0111\u1ec9nh \u0111i\u1ec7n \u00e1p.<\/li>\n<li><strong>Gi\u1ea3m nhi\u1ec5u b\u1eb1ng ph\u1ea7n m\u1ec1m:<\/strong>B\u1ecf qua c\u00e1c t\u00edn hi\u1ec7u c\u00f3 th\u1eddi gian qu\u00e1 ng\u1eafn.<\/li>\n<li><strong>B\u1ea3o v\u1ec7 b\u1eb1ng l\u1edbp ch\u1eafn:<\/strong>S\u1eed d\u1ee5ng c\u00e1p c\u00f3 l\u1edbp ch\u1eafn \u0111\u1ec3 gi\u1ea3m nhi\u1ec5u t\u1eeb b\u00ean ngo\u00e0i.<\/li>\n<\/ul>\n<h2>T\u1ea7m quan tr\u1ecdng c\u1ee7a t\u00e0i li\u1ec7u \ud83d\udcc4<\/h2>\n<p>T\u1ea1i sao t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt l\u1ea1i bao g\u1ed3m nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y? Ch\u00fang \u0111\u00f3ng vai tr\u00f2 nh\u01b0 h\u1ee3p \u0111\u1ed3ng gi\u1eefa nh\u00e0 s\u1ea3n xu\u1ea5t v\u00e0 ng\u01b0\u1eddi d\u00f9ng. N\u1ebfu b\u1ea1n tu\u00e2n th\u1ee7 s\u01a1 \u0111\u1ed3 th\u1eddi gian m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c, thi\u1ebft b\u1ecb s\u1ebd ho\u1ea1t \u0111\u1ed9ng nh\u01b0 mong \u0111\u1ee3i.<\/p>\n<p>N\u1ebfu b\u1ea1n thay \u0111\u1ed5i kh\u1ecfi s\u01a1 \u0111\u1ed3 (v\u00ed d\u1ee5: b\u1eb1ng c\u00e1ch thay \u0111\u1ed5i t\u1ed1c \u0111\u1ed9 xung clock), b\u1ea1n c\u00f3 nguy c\u01a1 vi ph\u1ea1m c\u00e1c gi\u1edbi h\u1ea1n v\u1ec1 th\u1eddi gian. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn h\u00e0nh vi kh\u00f4ng l\u01b0\u1eddng tr\u01b0\u1edbc \u0111\u01b0\u1ee3c. Lu\u00f4n tham kh\u1ea3o phi\u00ean b\u1ea3n m\u1edbi nh\u1ea5t c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian, v\u00ec c\u00e1c b\u1ea3n c\u1eadp nh\u1eadt c\u00f3 th\u1ec3 thay \u0111\u1ed5i \u0111\u1eb7c t\u00ednh \u0111i\u1ec7n.<\/p>\n<h2>Suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 \u0111\u1ed9 to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u \ud83c\udfc1<\/h2>\n<p>Th\u00e0nh th\u1ea1o s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 m\u1ed9t h\u00e0nh tr\u00ecnh, ch\u1ee9 kh\u00f4ng ph\u1ea3i \u0111\u00edch \u0111\u1ebfn. Ch\u00fang l\u00e0 c\u00e2y c\u1ea7u n\u1ed1i gi\u1eefa m\u00e3 tr\u1eebu t\u01b0\u1ee3ng v\u00e0 th\u1ef1c t\u1ebf v\u1eadt l\u00fd. Khi b\u1ea1n thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p h\u01a1n, c\u00e1c s\u01a1 \u0111\u1ed3 s\u1ebd tr\u1edf n\u00ean tinh vi h\u01a1n, nh\u01b0ng c\u00e1c nguy\u00ean l\u00fd c\u01a1 b\u1ea3n v\u1eabn gi\u1eef nguy\u00ean.<\/p>\n<p>B\u1eb1ng c\u00e1ch ch\u00fa \u00fd \u0111\u1ebfn c\u00e1c c\u1ea1nh, m\u1ee9c \u0111\u1ed9 v\u00e0 r\u00e0ng bu\u1ed9c, b\u1ea1n \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng nh\u00fang c\u1ee7a m\u00ecnh giao ti\u1ebfp m\u1ed9t c\u00e1ch \u0111\u00e1ng tin c\u1eady. D\u00f9 b\u1ea1n \u0111ang g\u1ee1 l\u1ed7i m\u1ed9t c\u1ea3m bi\u1ebfn \u0111\u01a1n gi\u1ea3n hay thi\u1ebft k\u1ebf m\u1ed9t giao di\u1ec7n t\u1ed1c \u0111\u1ed9 cao, s\u01a1 \u0111\u1ed3 th\u1eddi gian ch\u00ednh l\u00e0 b\u1ea3n \u0111\u1ed3 c\u1ee7a b\u1ea1n. H\u00e3y tr\u00e2n tr\u1ecdng n\u00f3, \u0111\u1ecdc k\u1ef9 t\u1eebng chi ti\u1ebft v\u00e0 \u0111\u1ec3 n\u00f3 d\u1eabn d\u1eaft c\u00e1c quy\u1ebft \u0111\u1ecbnh ph\u1ea7n c\u1ee9ng c\u1ee7a b\u1ea1n.<\/p>\n<p>H\u00e3y nh\u1edb r\u1eb1ng, m\u1ed7i \u0111\u01b0\u1eddng tr\u00ean bi\u1ec3u \u0111\u1ed3 \u0111\u00f3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t thay \u0111\u1ed5i \u0111i\u1ec7n \u00e1p v\u1eadt l\u00fd. Hi\u1ec3u \u0111\u01b0\u1ee3c m\u1ed1i li\u00ean h\u1ec7 n\u00e0y ch\u00ednh l\u00e0 \u0111i\u1ec1u ph\u00e2n bi\u1ec7t ng\u01b0\u1eddi \u0111am m\u00ea v\u1edbi m\u1ed9t k\u1ef9 s\u01b0 chuy\u00ean nghi\u1ec7p. H\u00e3y ti\u1ebfp t\u1ee5c luy\u1ec7n t\u1eadp, ti\u1ebfp t\u1ee5c \u0111o \u0111\u1ea1c v\u00e0 \u0111\u1ec3 c\u00e1c t\u00edn hi\u1ec7u d\u1eabn \u0111\u01b0\u1eddng cho b\u1ea1n.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hi\u1ec3u c\u00e1ch c\u00e1c th\u00e0nh ph\u1ea7n \u0111i\u1ec7n t\u1eed giao ti\u1ebfp v\u1edbi nhau l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng n\u1ec1n t\u1ea3ng trong k\u1ef9 thu\u1eadt h\u1ec7 th\u1ed1ng nh\u00fang. M\u1ed9t trong nh\u1eefng c\u00f4ng c\u1ee5 quan tr\u1ecdng nh\u1ea5t \u0111\u1ec3 tr\u1ef1c quan h\u00f3a s\u1ef1 giao ti\u1ebfp n\u00e0y l\u00e0 s\u01a1 \u0111\u1ed3 th\u1eddi gian. Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y m\u00f4 t\u1ea3 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1565,"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-1564","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 \u0111\u01b0\u1ee3c \u0111\u01a1n gi\u1ea3n h\u00f3a: Gi\u1edbi thi\u1ec7u cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u nh\u00fang \u23f1\ufe0f<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch \u0111\u1ecdc s\u01a1 \u0111\u1ed3 th\u1eddi gian cho h\u1ec7 th\u1ed1ng nh\u00fang. 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