Question

Write an 8086 assembly language program to initialize counter 2 of 8253

in mode 0 with a count of FFAAH.

Answer 1

This program is used to initialize counter 2 of 8253 in mode 0 with a count of FFAAH

CODE:

COUNTER PROC NEAR

CNT2 EQU 8002H ; ADDRESS OF COUNTER 2

CNTR EQU 8003H ; ADDRESS OF CONTROL REGISTER

MOV AL, B0H ; CONTROL WORD

OUT CNTR, AL   

MOV AL, AAH ; INITIALIZING COUNT FFAAH

OUT CNTR2, AL

MOV AL, FFH ; INITIALIZING COUNT FFAAH

OUT CNTR2, AL

READ: MOV AL, 80H ; FOR READING THE COUNT

OUT CNTR, AL

IN AL, CNT2

MOV DL, AL

IN AL, CNT2

OR AL, DL

JNZ READ

RET

COUNTER ENDP

The below table can be referred for better understanding:

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