nuetes.asm

单片机外接共阳数码管倒计时电路

START:
CLR P2
MOV R0,#0
MOV DPTR,#TABLE
LOOP:
INC R0
CJNE R0,#100,LOOP
JMP START
DISPLAY:
MOV A,R0
MOV B,#10
DIV AB
MOV R1,A
MOV R2,B
MOV A,R2
MOVC A,@A+DPTR
MOV P0,A
SETB P2.O
ACALL DLY10mS
CLR P2.0
MOV A,R1
MOVC A,@A+DPTR
MOV P0,A
SETB P2.1
ACALL DLY10mS
CLR P2.0


DLY10mS:
MOV R6,#1
D1:
MOV R7,#24
DJNZ R7,$
DJNZ R6,D1
RET
TABLE:
DB 0C0H,0F9H,0A4H,0B0H
DB 99H,92H,82H,0F8H
DB 80H,90H,88H,83H
DB 0C6H,0A1H,86H,8EH
END