利用定時器和中斷控制各種功能的程序代碼分享

1、兩個定時計數器合用的延時實驗

ORG 000H
AJMP MAIN
ORG 000BH
AJMP T_0
ORG 001BH
AJMP T_1
ORG 0030H
MAIN:
MOV P0,#0FFH
MOV TMOD,#51H
MOV TH0,#15H
MOV TL0,#0A0H
MOV TH1,#0FCH
MOV TL1,#18H
MOV IE,#8AH
SETB TR0
SETB TR1
LL: SJMP LL
T_0:MOV TH0,#15H
MOV TL0,#0A0H
CPL P0.2
RETI
T_1:MOV TH1,#0FCH
MOV TL1,#18H
CPL P0.1
RETI
END
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2、利用定時器演奏音樂

ORG? 001BH?? ;定時器T1的中斷入口?
MOV? TH1,R1? ;重裝定時初值?
MOV? TL1,R0? ;?
CPL? P3.7????? ;P1.0輸出方波?
RETI?????????? ;中斷返回?
ORG? 100H???? ;主程序?
START:MOV? TMOD,#01H ;定時器T1工作方式1?
MOV? IE,#88H?????????? ;允許T1中斷?
MOV? DPTR,#TAB??????? ;表格首地址?
LOOP:CLR? A?????????? ;?
MOVC? A,@A+DPTR???? ;查表?
MOV? R1,A????????????? ;定時器高8為存R1?
INC? DPTR????????????? ;?
CLR? A???????????????? ;?
MOVC? A,@A+DPTR???? ;查表?
MOV? R0,A????????????? ;定時器低8為存R0?
ORL? A,R1?????????????? ;?
JZ? NEXT0?????????????? ;全0為休止符?
MOV? A,R0????????????? ;?
ANL? A,R1?????????????? ;?
CJNE? A,#0FFH,NEXT???? ;全1表示樂曲結束?
SJMP? START????????????? ;從頭開始循環演奏?
NEXT:MOV? TH1,R1?????? ;裝入定時值?
MOV? TL1,R0???????????? ;?
SETB? TR1??????????????? ;啟動定時器?
SJMP? NEXT1???????????? ;?
NEXT0:CLR? TR1????????? ;關閉定時器停止發音?
NEXT1:CLR? A??????????? ;?
INC? DPTR??????????????? ;?
MOVC? A,@A+DPTR?????? ;查延遲常數?
MOV? R2,A??????????????? ;?
LOOP1:LCALL? D200?????? ;調用延時200mS子程序?
DJNZ? R2,LOOP1?????????? ;控制延遲次數?
INC? DPTR???????????????? ;?
AJMP? LOOP?????????????? ;處理下一個音符?
D200:MOV? R4,#81H??????? ;延時20mS子程序?
D200B:MOV? A,#0FFH????? ;?
D200A:DEC? A???????????? ;?
JNZ? D200A??????????????? ;?
DEC? R4?????????????????? ;?
CJNE? R4,#00H,D200B?????? ;?
RET??????????????????????? ;?
TAB:????? DB? 0FEH,25H,02H,0FEH,25H,02H;???
????????? DB? 0FEH,84H,02H,0FEH,84H,02H;?
????????? DB? 0FEH,84H,04H,0FEH,25H,04H;????
?? DB? 0FEH,25H,02H,0FEH,84H,02H;?
????????? DB? 0FEH,0C0H,04H,0FEH,0C0H,04H;?
?? DB? 0FEH,98H,02H,0FEH,84H,02H;?
????????? DB? 0FEH,57H,08H,00H,00H,04H;?????
?? DB? 0FFH,0FFH;?
????????? END

3、利用定時器通過延長定時方法實現燈的閃爍

ORG 0000H
AJMP START
ORG 000BH??????????????? ;定時器0的中斷向量地址
AJMP TIME0?????????????? ;跳轉到真正的定時器程序處
ORG 30H
START: MOV P0,#0FFH????? ;關所有燈
MOV 30H,#00H??????????????? ;
MOV TMOD,#00000001B????? ;定時/計數器0工作于方式1
MOV TH0,#3CH?
MOV TL0,#0A0H??????????? ;以上兩行預置立即數5536
SETB EA????????????????? ;開總中斷允許
SETB ET0???????????????? ;開定時/計數器0允許
SETB TR0???????????????? ;定時/計數器0開始運行
LOOP: AJMP LOOP????????? ;真正工作時,這里可寫任意程序
TIME0:?????????????????? ;定時器0的中斷處理程序
PUSH ACC???????????????? ;將ACC推入堆棧保護
PUSH PSW???????????????? ;將PSW推入堆棧保護
INC 30H
MOV A,30H
CJNE A,#20,TIME1?????????
CPL P0.0???????????????? ;取反P0.0
MOV 30H,#0
TIME1: MOV TH0,#15H??????? ;重置定時常數
MOV TL0,#9FH????????????
POP PSW
POP ACC
RETI
END

4、利用中斷方式實現燈的閃爍

ORG 0000H
AJMP START
ORG 000BH??????????????? ;定時器0的中斷向量地址
AJMP TIME0?????????????? ;跳轉到真正的定時器程序處
ORG 30H
START: MOV P0,#0FFH????? ;關所有燈
MOV TMOD,#00000001B????? ;定時/計數器0工作于方式1
MOV TH0,#15H?
MOV TL0,#0A0H??????????? ;以上兩行預置立即數5536
SETB EA????????????????? ;開總中斷允許
SETB ET0???????????????? ;開定時/計數器0允許
SETB TR0???????????????? ;定時/計數器0開始運行
LOOP: AJMP LOOP????????? ;真正工作時,這里可寫任意程序
mov r7, #09H
djnz r7,start
TIME0:?????????????????? ;定時器0的中斷處理程序
PUSH ACC???????????????? ;將ACC推入堆棧保護
PUSH PSW???????????????? ;將PSW推入堆棧保護
CPL P0.0???????????????? ;取反P0.0
MOV TH0,#15H
MOV TL0,#0A0H??????????? ;重置定時常數
POP PSW
POP ACC
RETI
END

5、外部中斷實驗

ORG 0000H?
AJMP START?
ORG 0003H????????????? ;外部中斷地直入口?
AJMP INTO?
ORG 30H?
START: MOV SP,#5FH?
MOV P0,#0FFH?????????? ;燈全滅?
MOV P3,#0FFH?????????? ;P3口置高電平?
SETB EA?
SETB EX0?
AJMP $?
INTO:?
PUSH ACC?
PUSH PSW?
CPL P0.0?
POP PSW?
POP ACC?
RETI?
END

6、利用軟件定時器實現燈的閃爍

;用軟件定時器實現P0.0口所接燈按1S/次而P0.1口所接燈按2S/次閃爍
ORG 0000H
AJMP START
ORG 000BH??????????????? ;定時器0的中斷向量地址
AJMP TIME0?????????????? ;跳轉到真正的定時器程序處
ORG 0030H
START: MOV P0,#0FFH????? ;關所有燈
MOV 30H,#00H???????????? ;軟件計數器清零
MOV TMOD,#00000001B????? ;定時/計數器0工作于方式1
MOV TH0,#3CH?
MOV TL0,#0A0H??????????? ;以上兩行預置立即數15536
SETB EA????????????????? ;開總中斷允許
SETB ET0???????????????? ;開定時/計數器0允許
SETB TR0???????????????? ;定時/計數器0開始運行
LOOP: AJMP LOOP????????? ;真正工作時,這里可寫任意程序
TIME0:?????????????????? ;定時器0的中斷處理程序
PUSH ACC???????????????? ;將ACC推入堆棧保護
PUSH PSW???????????????? ;將PSW推入堆棧保護
INC 30H
INC 31H????????????????? ;兩個計數器都加1
MOV A,30H
CJNE A,#255,TNEXT???????? ;30H單元中的值到了20了嗎?????????
CPL P0.0???????????????? ;到了，取反P0.0
MOV 30H,#0?????????????? ;清軟件計數器
TNEXT:MOV A,31H
CJNE A,#40,TRET?????????? ;31H單元中的值到了40了嗎
CPL P0.1
MOV 31H,#0??????????????? ;到了，取反P1.1并清零計數器，返回
TRET: MOV TH0,#15H??????? ;重置定時常數
MOV TL0,#9FH????????????
POP PSW
POP ACC
RETI
END

7、利用定時器實現燈的閃爍

ORG 0000H
AJMP START
ORG 30H
START: MOV P0,#0FFH? ;關閉所有的燈
MOV TMOD,#00000001B? ;定時/計數器0工作于方式1
MOV TH0,#15H
MOV TL0,#0A0H??????? ;以上兩行預置計數5336（15A0H）
SETB TR0???????????? ;定時/計數器0開始運行
LOOP: JBC TF0,NEXT?? ;如果TF0等于1，則將TF0清0并轉next處
AJMP LOOP??????????? ;否則跳轉到LOOP處運行
NEXT: CPL P0.0?????? ;點亮P0.0燈
MOV TH0,#15H???????? ;
MOV TL0,#0A0H??????? ;重置定時/計數器的初值
AJMP LOOP
END
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