SAN3010 datasheet(7/13 Pages) SAMES

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MCS-51 MACRO ASSEMBLER

KEY

09/09/96

PAGE

LOC

OBJ

LINE

SOURCE

; (c) Austria Mikro Systeme International AG AMS

; J.Janisch

/ telecom applications

; Program name:

KEY.ASM

; Version:

A01

; Date:

1996-09-09

; Author:

J.Janisch / Telecom Applications

;

; User program for 8051 interface to SA253x for key entry via

;

microcontroller

; Application Note AN3010

; Program code is at Address 4000 HEX

;

; Reference for calculations:

; Clock Frequency of Microcontroller (80C31) = 11.0592 MHz

;

--> 1 machine cycle = 12 clock cycles = 1.085 us

;

; Decoder Logic:

; Port1:

; P1.7 : active low input; detects rising edge of C1 OR C2

;

should be set high by any output command to port 1

; P1.6 : not used

; P1.5 : not used

; P1.4 : forces selected row/column high or low

; P1.3 : when high, disables all rows/columns (high Z)

; P1.2 : row / column selector

MSB

; P1.1 : row / column selector

; P1.0 : row / column selector

LSB

;

P1.2 P1.1 P1.0

select:

;

row 1

;

row 2

;

row 3

;

row 4

;

column 1

;

column 2

;

column 3

;

column 4

;

0000

Row1

equ

0001

Row2

equ

0002

Row3

equ

0003

Row4

equ

0004

Col1

equ

0005

Col2

equ

0006

Col3

equ

0007

Col4

equ

0090

ForceHi equ

90H

0080

ForceLo equ

80H

13 Appendix C: Sample Software listing

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