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SA2532 Datasheet(PDF) 7 Page - Sames |
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SA2532 Datasheet(HTML) 7 Page - Sames |
7 / 13 page SAN3010 sames sames sames sames 7/13 MCS-51 MACRO ASSEMBLER KEY 09/09/96 PAGE 1 LOC OBJ LINE SOURCE 1 ; (c) Austria Mikro Systeme International AG AMS 2 ; J.Janisch / telecom applications 3 ; Program name: KEY.ASM 4 ; Version: A01 5 ; Date: 1996-09-09 6 ; Author: J.Janisch / Telecom Applications 7 ; 8 ; User program for 8051 interface to SA253x for key entry via 9 ; microcontroller 10 ; Application Note AN3010 11 ; Program code is at Address 4000 HEX 12 ; 13 ; Reference for calculations: 14 ; Clock Frequency of Microcontroller (80C31) = 11.0592 MHz 15 ; --> 1 machine cycle = 12 clock cycles = 1.085 us 16 ; 17 ; Decoder Logic: 18 ; Port1: 19 ; P1.7 : active low input; detects rising edge of C1 OR C2 20 ; should be set high by any output command to port 1 21 ; P1.6 : not used 22 ; P1.5 : not used 23 ; P1.4 : forces selected row/column high or low 24 ; P1.3 : when high, disables all rows/columns (high Z) 25 ; P1.2 : row / column selector MSB 26 ; P1.1 : row / column selector 27 ; P1.0 : row / column selector LSB 28 ; 29 ; P1.2 P1.1 P1.0 select: 30 ; 0 0 0 row 1 31 ; 0 0 1 row 2 32 ; 0 1 0 row 3 33 ; 0 1 1 row 4 34 ; 1 0 0 column 1 35 ; 1 0 1 column 2 36 ; 1 1 0 column 3 37 ; 1 1 1 column 4 38 ; 39 40 0000 41 Row1 equ 0 0001 42 Row2 equ 1 0002 43 Row3 equ 2 0003 44 Row4 equ 3 0004 45 Col1 equ 4 0005 46 Col2 equ 5 0006 47 Col3 equ 6 0007 48 Col4 equ 7 0090 49 ForceHi equ 90H 0080 50 ForceLo equ 80H 13 Appendix C: Sample Software listing |
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