计数器.asm

计数器的源码

COUNT  EQU  30H
KEY1  BIT   P3.7
ORG  0000H
LJMP START
ORG  0030H
START:  MOV  COUNT, #00H

NEXT:	MOV  A,COUNT
		MOV  B,#10
		DIV  AB
		MOV  DPTR,#TABLE
		MOVC  A,@A+DPTR
		CLR  P2.1	  ;打开位选1数码管
		MOV  P0,A
		ACALL DELAY
		MOV  P0,#0XFF	;消隐
		SETB  P2.1		;关闭位选1
		MOV  A,B
		MOVC  A,@A+DPTR;送段选2
		CLR  P2.0	    ;打开位选2数码管
		MOV  P0,A		;
		ACALL DELAY
		MOV   P0,#0FFH	;消隐
		SETB  P2.0		;关闭位选2
		JNB   P3.6,START
		JB    KEY1,NEXT

WAIT:   JNB   KEY1,WAIT
		ACALL DELAY
		JNB   KEY1,WAIT
		INC   COUNT
		MOV   A,COUNT
		CJNE  A,#100,NEXT
		AJMP  START

DELAY:  MOV  R7,#2		 ;延时程序
   D1:	MOV  R6,#100
   		DJNZ R6,$
		DJNZ R7,D1
		RET

TABLE:  DB  03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H 
END