怎样编写一个交通信号灯的程序
怎样编写一个交通信号灯的程序
要求每隔一秒显示一下，循环显示
start:
mov a,0f8h
mov pac,a ；
mov a,0
mov pa,a
loop：clr pa.2
set pa.0 ；红灯亮,黄灯灭
delay1: mov a,1 ；delay1秒
mov r1,a
lp12: mov a,165
mov r2,a
lp11: sdz r2
jmp lp11
sdz r1
jmp lp12
clr pa.0
set pa.1 ；黄灯亮，红灯灭
delay2: mov a,1 ；delay1秒
mov r1,a
lp22: mov a,165
mov r2,a
lp21: sdz r2
jmp lp11
sdz r1
jmp lp12
clr pa.1
set pa.2 ；绿灯亮，黄灯灭
delay3: mov a,1 ；delay1秒
mov r1,a
lp32: mov a,165
mov r2,a
lp31: sdz r2
jmp lp11
sdz r1
jmp lp12
jmp loop
