ORG 0000H
LJMP MAIN
ORG 0003H
LJMP INTRP0 ;INT0中断
ORG 000BH
LJMP T0INT ;T0中断
ORG 0030H
MAIN:
MOV R0,#00H
MOV SP,#05FH
MOV PSW,#00H
MOV TCON,#00H
SETB IT0 ;INT0下降沿
SETB EX0 ;允许INT0
MOV TMOD,#01H ;T0为16位定时器
MOV TL0,#00H ;设定T0的定时初值，定时时间约为50ms(11.0592M晶振）
MOV TH0,#04CH
SETB ET0 ;允许T0中断
SETB PT0 ;T0为高优先级中断
SETB EA ;开中断
SETB TR0 ;启动T0
LOOP: MOV R0,#00H
MOV TL0,#00H ;喂狗
MOV TH0,#04CH
LJMP LOOP ; 返回LOOP
INTRP0:
ZHIXING:CLR P0.0
CGQ1PD: JNB P1.0,CGQ1 ;SENSOR1
SJMP CGQ1PD
CGQ1: MOV 040H,#04H;DELAY 500MS
QT1: MOV 041H,#0FFH
DMS1: MOV 042H,#0FFH
DJNZ 042H,$
DJNZ 041H,DMS1
DJNZ 040H,QT1
CLR P0.1
CGQ2PD: JNB P1.1,CGQ2;SENSOR2
SJMP CGQ2PD
CGQ2: MOV 043H,#04H;DELAY 500MS
QT2: MOV 044H,#0FFH
DMS2: MOV 045H,#0FFH
DJNZ 045H,$
DJNZ 044H,DMS2
DJNZ 043H,QT2
CLR P0.2
CGQ3PD: JNB P1.2,CGQ3;SENSOR3
SJMP CGQ3PD
CGQ3: MOV 046H,#04H;DELAY 500MS
QT3: MOV 047H,#0FFH
DMS3: MOV 048H,#0FFH
DJNZ 048H,$
DJNZ 047H,DMS3
DJNZ 046H,QT3
CPL P0.2
SF1: MOV 049H,#02H;DELAY 250MS
QT4: MOV 04AH,#0FFH
DMS4: MOV 04BH,#0FFH
DJNZ 04BH,$
DJNZ 04AH,DMS4
DJNZ 049H,QT4
JNB P1.2,SF1
CPL P0.1
SF2: MOV 04CH,#02H ;DELAY 250MS
QT5: MOV 04DH,#0FFH
DMS5: MOV 04EH,#0FFH
DJNZ 04EH,$
DJNZ 04DH,DMS5
DJNZ 04CH,QT5
JNB P1.1,SF2
CPL P0.0
SF3: MOV 04FH,#02H ;DELAY 250MS
QT6: MOV 050H,#0FFH
DMS6: MOV 051H,#0FFH
DJNZ 051H,$
DJNZ 050H,DMS6
DJNZ 04FH,QT6
JNB P1.0,SF3
RETI
T0INT: INC R0
CJNE R0,#0C8H,FANHUI;看门狗设定10s
MOV R0,#00H
SETB P0.0
SETB P0.1
SETB P0.2
CLR A
PUSH ACC
PUSH ACC
FANHUI:RETI
在执行外部中断0时，如果保持p1口为高电平，使一直执行中断0，不退出。直到10s后，t0中断执行看门狗，但执行过看门狗后，再触发外部中断0，中断0中断不能执行，不知为什么？请个位老鸟们帮下忙
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