想做个定时器定时给继电器供电或断电，时间可调，默认2分钟，
8255 pa，pb控制数码管，pc扫描键盘（只要4个键，pc1.2.3为行，pc4为列），做了几天始终做不来，可以显示，但是不能工作。。。。
高手帮忙改下程序
PA XDATA 0D1FFH
PB XDATA 0D2FFH
;PC XDATA 0D5FFH
CON XDATA 0D7FFH
SL EQU 40H
SH EQU 41H
ML EQU 42H
ORG 0000H
LJMP MAIN
ORG 000BH
MAIN:
MOV 30H,#00H
MOV 40H,#00H
MOV 41H,#00H
MOV 42H,#02H
MOV 60H,#1FH
MOV TMOD,#21H ;定时器工作方式;
MOV TH0,#3CH
MOV TL0,#0B0H
SETB EA ;开中断;
SETB ET0
SETB ET1
MOV DPTR,#CON ;控制字设置;
MOV A,#81H
MOVX @DPTR,A
LJMP KEYSCAN
LJMP START
LJMP TIME
;数码管显示函数;
START:
MOV 20H,#00H
MOV DPTR,#0D1FFH ;A选通分个位;
MOV A,#0FEH
MOVX @DPTR,A
MOV DPTR,#0D2FFH ;送PB显示分秒间隔符;
MOV A,#0A0H
MOVX @DPTR,A
MOV DPTR,#0D2FFH ;关闭数码管;
MOV A,0FFH
MOVX @DPTR,A
MOV DPTR,#0D1FFH ;A选通分个位;
MOV A,#0FDH
MOVX @DPTR,A
MOV A,42H ;分个位数赋值给a;
ADD A,20H
MOV DPTR,#TABLE ;取分个位数;
MOVC A,@A+DPTR
MOV 21H,A ;送pb显示分个位;
MOV DPTR,#0D2FFH
MOV A,21H
MOVX @DPTR,A
MOV DPTR,#0D2FFH ;闭数码管;
MOV A,0FFH
MOVX @DPTR,A
MOV DPTR,#0D1FFH ;A选通分秒间隔符;
MOV A,#0FBH
MOVX @DPTR,A
MOV DPTR,#0D2FFH ;送PB显示分秒间隔符;
MOV A,#07FH
MOVX @DPTR,A
MOV DPTR,#0D2FFH ;闭数码管;
MOV A,0FFH
MOVX @DPTR,A
MOV DPTR,#0D1FFH ;A选通秒十位;
MOV A,#0F7H
MOVX @DPTR,A
MOV A,41H ;秒十位数赋值给a;
ADD A,20H
MOV DPTR,#TABLE ;取秒十位数;
MOVC A,@A+DPTR
MOV 21H,A ;送pb显示秒十位;
MOV DPTR,#0D2FFH
MOV A,21H
MOVX @DPTR,A
MOV DPTR,#0D2FFH ;闭数码管;
MOV A,0FFH
MOVX @DPTR,A
MOV DPTR,#0D1FFH ;A选通秒个位;
MOV A,#0EFH
MOVX @DPTR,A
MOV A,40H ;秒个位数赋值给a;
ADD A,20H
MOV DPTR,#TABLE ;取秒个位数;
MOVC A,@A+DPTR
MOV 21H,A ;送pb显示秒个位;
MOV DPTR,#0D2FFH
MOV A,21H
MOVX @DPTR,A
MOV A,40H
JNZ OVER ;sl=0？是，继续，否，over;
MOV A,41H
JNZ OVER ;sH=0？是，继续，否，over;
MOV A,60H
JNZ OVER
CLR TR0 ;定时器关闭;
SETB TR1 ;定时器打开;
SETB P1.2 ;断开继电器;
MOV DPTR,#0D1FFH
MOV A,#00H
MOVX @DPTR,A
MOV DPTR,#0D2FFH
MOV A,#0A0H
MOVX @DPTR,A
OVER:LJMP START
TABLE:DB 0A0H,0BBH,62H,2AH,39H,2CH,24H,0BAH,20H,28H,0A0H
RET
;计时函数;
TIME:
PUSH ACC
PUSH PSW
INC 30H ;20次计数器加1;
MOV A,30H
CJNE A,#20H,GOON ;到20次？是，继续执行，否，跳入GOON;
MIAO:
MOV 30H,#00H
DEC 40H ;秒低位减1;
MOV A,40H
CJNE A,#00H,GOON ;sl=0?是，继续，否，跳入goon;
DEC 41H ;秒高位减1;
MOV A,41H
CJNE A,#00H,GOON ;SH=0？是，继续，否，goon;
DEC 42H ;分减1;
CJNE A,#00H,GOON ;ml=0？是，继续，否goon;
GOON:
MOV TH0,#3CH
MOV TL0,#0B0H
SETB TR0
POP PSW
POP ACC
RETI
;键盘扫描程序;
KEYSCAN:
MOV DPTR,#CON ;控制字设置;
MOV A,#81H
MOVX @DPTR,A
LOOP1: MOV DPTR,#0D5FFH ;拉高PC.4;
MOV A,#10H
MOVX @DPTR,A
MOVX A,@DPTR
ANL A,#0FH ;判断是否有键闭合;
JZ DONE
ACALL DELAY50
MOV A,#10H
ANL A,#0FH
LOOP2:ADD A,#10H
CJNE A,#18H,LOOP3
MOV 42H,#00H
INC 40H
MOV R0,40H
CJNE @R0,#09H,LOOP3
INC 41H
MOV 40H,#00H
MOV R0,40H
LOOP3:CJNE A,#14H,LOOP4
CJNE @R0,#00H,LOOP4
MOV 40H,#09H
LOP: DEC 40H
DEC 41H
LOOP4:CJNE A,#12H,LOOP5
SETB TR0
CLR P1.2 ;继电器;
LOOP5:CJNE A,#11H,LOOP6
CLR TR0
SETB P1.2
LOOP6:MOV A,0D5FFH
MOV P1,A ;P1=PC ;
DONE: RET
DELAY50:MOV R7,#200
D1:MOV R6,#123
D2:DJNZ R6,D2
NOP
DJNZ R7,D1
RET
DELAY100:MOV R7,#400
D5:MOV R6,#123
D6:DJNZ R6,D2
NOP
DJNZ R7,D1
RET
END
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