程序如下
T0_VAL EQU -10000
ORG 0000H
AJMP MAIN
ORG 0003H
AJMP COUNT
ORG 000BH
AJMP TIME
ORG 0030H
MAIN:
MOV R7,#100
MOV R3,#10
MOV R2,#15
MOV TH0,#HIGH T0_VAL
MOV TL0,#LOW T0_VAL
MOV DPTR,#TAB
MOV R4.#99
MOV R5,#0FFH
MOV R6,#5
MOV TMOD,#01H
SETB PT0
MOV SP,#5FH
SETB IT0
MOV IE,#10000011B
SETB ET0
SETB TR0
VIEW:
CLR A
MOV A,R0
MOV B,#10
DIV AB
MOVC A,@A+DPTR
MOV P1,A
MOV P2,#08H
MOV P2,#0H
;*************************************
MOV ACC,B
MOVC A,@A+DPTR
MOV P2,#04H
MOV P1,A
MOV P2,#0H
;*************************************
MOV A,R1
MOV B,#10
DIV AB
MOVC A,@A+DPTR
DEC A
MOV P1,A
MOV P2,#02H
MOV P2,#0H
;************************************
MOV ACC,B
MOVC A,@A+DPTR
MOV P1,A
MOV P2,#01H
MOV P2,#0H
LJMP VIEW
TAB:DB 3H,9FH,25H,0DH,99H,49H,41H,1FH,01H,9H
COUNT:
PUSH PSW
DJNZ R4,GAO
MOV R4,#99
INC 30H
MOV 31H,#0
SJMP NEXT
GAO:
INC 31H
NEXT:
POP PSW
RETI
;************************************
TIME:
DJNZ R7,AGAIN
MOV R7,#100
DJNZ R3,AGAIN
MOV R3,#10
MOV R4,#99
MOV R0,30H
MOV R1,31H
MOV 30H,#0
MOV 31H,#0
SJMP HUI
AGAIN:
MOV TH0,#HIGH T0_VAL
MOV TL0,#LOW T0_VAL
HUI:
RETI
END