有没有人帮忙看一下原理图，为什么vcc换成激励源显示的出来但一直是8888
SECOND EQU 30H
MINITE EQU 31H
HOUR EQU 32H
HOURK BIT P3.0;按键设置小时
MINITEK BIT P3.1;按键设置分钟
SECONDK BIT P3.2;按键设置秒
DISPBUF EQU 40H
DISPBIT EQU 48H
T2SCNTA EQU 49H
T2SCNTB EQU 4AH
TEMP EQU 4BH
ORG 0000H
AJMP START
ORG 000BH
LJMP INT_T0
START:MOV SECOND,#00H
MOV MINITE,#00H
MOV HOUR,#12
MOV DISPBIT,#00H
MOV T2SCNTA,#00H
MOV T2SCNTB,#00H
MOV TEMP,#0FEH
ACALL DISP
MOV TMOD,#01H
MOV TH0,#(65536-2000)/256
MOV TL0,#(65536-2000)MOD 256
SETB TR0
SETB ET0
SETB EA
WT:JB SECONDK,NK1
ACALL DELY10MS
JB SECONDK,NK1
INC SECOND
MOV A,SECOND
CJNE A,#60,NS60
MOV SECOND,#00H
NS60:ACALL DISP
JNB SECONDK,$
NK1:JB MINITEK,NK2
ACALL DELY10MS
JB MINITEK,NK2
INC MINITE
MOV A,MINITE
CJNE A,#60,NM60
MOV MINITE,#00H
NM60:ACALL DISP
JNB MINITEK,$
NK2:JB HOURK,NK3
ACALL DELY10MS
JB HOURK,NK3
INC HOUR
MOV A,HOUR
CJNE A,#24,NH24
MOV HOUR,#00H
NH24:ACALL DISP
JNB HOURK,$
NK3:AJMP WT
DELY10MS:MOV R6,#10
D1:MOV R7,#248
DJNZ R7,$
DJNZ R6,D1
RET
DISP:MOV A,#DISPBUF
ADD A,#8
DEC A
MOV R1,A
MOV A,HOUR
MOV B,#10
DIV AB
MOV @R1,A
DEC R1
MOV A,B
MOV @R1,A
DEC R1
MOV A,#10
MOV@R1,A
DEC R1
MOV A,MINITE
MOV B,#10
DIV AB
MOV @R1,A
DEC R1
MOV A,B
MOV @R1,A
DEC R1
MOV A,#10
MOV@ R1,A
DEC R1
MOV A,SECOND
MOV B,#10
DIV AB
MOV @R1,A
DEC R1
MOV A,B
MOV @R1,A
DEC R1
RET
INT_T0:
MOV TH0,#(65536-2000)/256
MOV TL0,#(65536-2000)MOD 256
MOV A,#DISPBUF
ADD A,DISPBIT
MOV R0,A
MOV A,@R0
MOV DPTR,#TABLE
MOVC A,@ A+DPTR
MOV P0,A;输出数码管段码数据
MOV A,DISPBIT
MOV DPTR,#TAB
MOVC A,@ A+DPTR
MOV P2,A;查表TAB 得到位选(共用8位来位选）
INC DISPBIT
MOV A,DISPBIT
CJNE A,#08H,KNA
MOV DISPBIT,#00H
KNA:INC T2SCNTA
MOV A,T2SCNTA
CJNE A,#100,DONE
MOV T2SCNTA,#00H
INC T2SCNTB
MOV A,T2SCNTB
CJNE A,#05H,DONE
MOV T2SCNTB,#00H
INC SECOND
MOV A,SECOND
CJNE A,#60,NEXT
MOV SECOND,#00H
INC MINITE
MOV A,MINITE
CJNE A,#60,NEXT
MOV MINITE,#00H
INC HOUR
MOV A,HOUR
CJNE A,#24,NEXT
MOV HOUR,#00H
NEXT:ACALL DISP
DONE:RETI
TABLE: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH,40H
TAB:DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FH
END
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