微机原理实验8255并行接口与交通灯设计.docx

8255并行接口与交通灯设计
状态1：东西路口绿灯亮10s，南北路口红灯亮10s
状态2：东西路口绿灯灭，黄灯闪烁5次，期间南北路口红灯保持亮
状态3：东西路口黄灯灭，红灯亮10s，南北路口绿灯亮10s
状态4：东西路口红灯保持亮，南北路口绿灯灭，黄灯闪烁5次

CODE SEGMENT
ASSUME CS:CODE

START:MOV AL,10000000B
MOV DX,28BH
OUT DX,AL

D1: MOV AL,00100100B
MOV DX,288H
OUT DX,AL
CALL DELAY1
MOV CX,5

D2: MOV AL,00000100B
MOV DX,288H
OUT DX,AL
CALL DELAY2
MOV AL,01000100B
MOV DX,288H
OUT DX,AL
CALL DELAY2
LOOP D2

D3: MOV AL,10000001B
MOV DX,288H
OUT DX,AL
CALL DELAY1
MOV CX,5

D4: MOV AL,10000000B
MOV DX,288H
OUT DX,AL
CALL DELAY2
MOV AL,10000010B
MOV DX,288H
OUT DX,AL
CALL DELAY2
LOOP D4
JMP D1

DELAY1 PROC NEAR
PUSH CX
PUSH DI
MOV CX,2000
Y1: MOV DI,9000
X1: DEC DI
JNZ X1
LOOP Y1
POP DI
POP CX
RET
DELAY1ENDP

DELAY2 PROC NEAR
PUSH CX
PUSH DI
MOV CX,200
Y2: MOV DI,9000
X2: DEC DI
JNZ X1
LOOP Y1
POP DI
POP CX
RET
DELAY2ENDP

CODE ENDS
END START