SAN3010 Ver la hoja de datos (PDF) - South African Micro Electronic Systems
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Fabricante
SAN3010
South African Micro Electronic Systems
SAN3010 Datasheet PDF : 13 Pages
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SAN3010
13 Appendix C: Sample Software listing
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
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; Application Note AN3010
11
; Program code is at Address 4000 HEX
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;
13
; Reference for calculations:
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; Clock Frequency of Microcontroller (80C31) = 11.0592 MHz
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;
--> 1 machine cycle = 12 clock cycles = 1.085 us
16
;
17
; Decoder Logic:
18
; Port1:
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; P1.7 : active low input; detects rising edge of C1 OR C2
20
;
should be set high by any output command to port 1
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; P1.6 : not used
22
; P1.5 : not used
23
; P1.4 : forces selected row/column high or low
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; P1.3 : when high, disables all rows/columns (high Z)
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; P1.2 : row / column selector MSB
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; P1.1 : row / column selector
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; P1.0 : row / column selector LSB
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;
29
;
P1.2 P1.1 P1.0 select:
30
;
000
row 1
31
;
001
row 2
32
;
010
row 3
33
;
011
row 4
34
;
100
column 1
35
;
101
column 2
36
;
110
column 3
37
;
111
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
7/13
sames
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