OmaerFaruq
Newbie
I have interfaced 82c55a with 8086. PortA (Mode 0) is defined as input and PotB (Mode 0) and PortC are defined as output. I have read PortA and send it to PortB. As well as, PC0 and and PC1 are set by BSR command. But it is not working. I have attached the Proteus file. The assembly code is provided with the internal assembler. I have also added the code below.
Code:
Code:
Code:
DATA SEGMENT
PORTA EQU 00H;0000 0000
PORTB EQU 02H;0000 0010
PORTC EQU 04H;0000 0100
CWR EQU 06H;0000 0110
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
MOV AX,DATA
MOV DS, AX
START:
MOV AL, 90H ;1001 1000-->I/0,MA1,MA2,PA I/O,PCUp I/O, MB, PB I/0, PCl I/O
OUT CWR, AL
MOV AL, 01H ;0000 0001 BSR command PC0
OUT CWR, AL
MOV AL, 03H ;0000 0011 BSR command PC1
OUT CWR, AL
XX:
IN AL,PORTA
OUT PORTB,AL
JMP XX
CODE ENDS
END START
Last edited: