vixulychuong5 - Bi gi ng K thu t Vi x l Ngnh i n t -Vi n...

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Unformatted text preview: Bi gi ng K thu t Vi x l Ngnh i n t -Vi n thng i h c Bch khoa N ng c a H Vi t Vi t, Khoa TVT Ti li u tham kh o [1] K thu t vi x l, Vn Th Minh, NXB Gio d c, 1997 [2] K thu t vi x l v L p trnh Assembly cho h vi x l, Xun Ti n, NXB Khoa h c & k thu t, 2001 Chng 5 Thit k cc cng I/O 5.1 I/O c phn vng nh v I/O tch bi t - I/O c phn vng nh (Memory Mapped I/O) - I/O tch bi t (Isolated I/O) 5.2 Cc chip MSI dng lm c ng I/O - C ng ra - C ng vo 5.3 Chip 8255- S chn, S kh i ch c nng - Cc mode ho t ng - Gi i m a ch - L p trnh cho 8255 5.1 C n phn bi t 2 ki u thi t k I/O c phn vng nh (Memory mapped I/O): - 1 c ng c xem nh m t nh - 1 c ng c a ch 20-bit - c truy c p khi IO/M = 0 - khng c n m ch gi i m a ch ring I/O tch bi t (isolated I/O) - 1 c ng c xem ng l 1 c ng - 1 c ng c a ch 16-bit, 12-bit, 8-bit - c truy c p khi IO/M = 1- c n m ch gi i m a ch I/O ring 5.2 Cc chip MSI th ng dng lm c ng I/O 74LS373 74LS374 74LS244 74LS245 Khi s l ng c ng t v c nh Cch m c m ch s quy t nh cho chip l c ng ra hay c ng vo v a ch c a n S d ng 74LS245 lm c ng ra : mov al, 55 mov dx, F000 out dx, al : 8088 Minimum Mode A18 A0 : D7 D6 IOR IOW A19 D5 D4 D3 D2 D1 D0 74LS245 B0 B1 B2 B3 B4 B5 B6 B7 A0 A1 A2 A3 A4 A5 A6 A7 E DIR 5V A 1 5 A 1 4 A 1 3 A 1 2 A 1 1 A 1 A 9 A 8 A 7 A 6 A 5 A 4 A 3 A 2 A 1 A IOW S d ng 74LS373 lm c ng ra...
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This note was uploaded on 01/10/2010 for the course ECE 37 taught by Professor Viet during the Spring '09 term at Albany State University.

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vixulychuong5 - Bi gi ng K thu t Vi x l Ngnh i n t -Vi n...

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