led显示.asm

采用汇编加C语言书写的LED程序

LED:	MOV A,#80H
	MOV DPTR,#7F03H
	MOV @DPTR,A
	MOV R2,57H
	MOV R3,7FH
LED1:	MOV DPTR,#TAB
	MOV A,@R2
	MOV A,@A+DPTR
	MOV DPTR,#7FOOH
	MOV @DPTR,A
	INC DPTR
	MOV A,@R3
	MOV @DPTR,A
	CALL DELAY
        JNB ACC.0,LED2
	DEC R2
	RR A
	MOV R3,A
	JMP LED1
LED2: RET
DELAY: MOV R4,#0CH
     T1: MOV R5,#FFH
     T2: DJNZ RT,T22
	 DJNZ R4,T1
	 RET
TAB: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H
     DB 7FH,6FH,77H,7CH,39H,5EH,79H,71H