📄 微机原理课程设计报告之四--红绿灯设计- 青苹乐 - 新浪blog.htm
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<P> CALL
DELAY10
;延迟</P>
<P> CALL
DELAY10</P>
<P> OR
AL,0F0H
;灭2，4绿灯</P>
<P> OUT DX,
AL</P>
<P> MOV CX,
0008H
;8次</P>
<P>GGG: MOV DX, 219H</P>
<P> MOV
AL,PB
;亮2，4黄灯</P>
<P> AND
AL,01011111B</P>
<P> OUT DX,
AL</P>
<P> CALL
DELAY1
;延迟</P>
<P> OR
AL,10100000B
;灭2，4黄灯</P>
<P> OUT DX,
AL</P>
<P> CALL
DELAY1
;延迟</P>
<P> LOOP
GGG
;黄灯闪烁8次</P>
<P> MOV DX,
21AH</P>
<P> MOV
AL,0F0H
;4个红灯亮，4个绿灯灭</P>
<P> OUT DX,
AL</P>
<P>
CALL
DELAY1
;延迟</P>
<P> MOV AH,
06H</P>
<P> MOV
DL,0FFH
;判断是否有键按下，有则转PPP</P>
<P> INT
21H</P>
<P> JNZ
PPP</P>
<P> JMP
LLL
;继续</P>
<P>PPP: MOV AX,
4C00H
;返回DOS</P>
<P> INT
21H</P>
<P>DELAY1 PROC
NEAR
;延迟子程序1</P>
<P>
PUSH CX</P>
<P> MOV CX,
8000H</P>
<P>CCC: LOOP CCC</P>
<P> POP
CX</P>
<P> RET</P>
<P>DELAY1 ENDP</P>
<P>DELAY10 PROC
NEAR
;延迟子程序2</P>
<P>
PUSH AX</P>
<P> PUSH
CX</P>
<P> MOV CX,
0030</P>
<P>UUU: CALL DELAY1</P>
<P> LOOP
UUU</P>
<P> POP
CX</P>
<P> POP
AX</P>
<P> RET</P>
<P>DELAY10 ENDP</P>
<P>CODE ENDS</P>
<P> END
START</P></DIV></DIV></TD></TR></TBODY></TABLE>
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