交通灯指挥系统的总体设计报告(12)

YELLOW2: MOV DX,D8255A

MOV AL,11011110B ;2黄1红 OUT DX,AL CALL WORK3

MOV DX,D8255A

MOV AL,11111110B ;2号黄灯灭 OUT DX,AL

MOV AH,06H

MOV DL,0FFH ;判断是否有键按下，有则转ppp

JZ PPP

JMP SHOW1

PPP: MOV AX,4C00H INT 21H RET

WORK1 ENDP

WORK2 PROC NEAR MOV SEC,60 push cx mov cl,01 SHOW2:

CALL DELAY1

CALL CLEAR_LED ;清空RAM call show CMP SEC,10 JNZ CONTINUE MOV SEC,60 dec cl cmp cl,00 jE over

CONTINUE: DEC SEC JMP SHOW2

over:

pop cx