请编写一段输出程序,使8255A的C口的c1输出占空比为1/3的周期脉冲

MY8255_A EQU 9C60H
MY8255_B EQU 9C61H
MY8255_C EQU 9C62H
MY8255_MODE EQU 9C63H

CODE SEGMENT
ASSUME CS:CODE

START: MOV DX,MY8255_MODE
MOV AL,82H
OUT DX,AL
A1: MOV DX,MY8255_B
IN AL,DX
MOV DX,MY8255_A
OUT DX,AL
CALL BREAK
JMP A1

BREAK PROC NEAR
MOV AH,06H
MOV DL,0FFH
INT 21H
JE RETURN
MOV AX,4C00H
INT 21H
RETURN:RET
BREAK ENDP

CODE ENDS
END START本回答被提问者采纳