点灯.asm

包含单片机开发的入门程序

ORG 0000H

START:
      MOV A,#0FFH
      CLR C
      MOV R2,#08H
LOOP: RLC A
      MOV P0,A
      CALL DELAY
      DJNZ R2,LOOP
      MOV R2,#07H
LOOP1:    RRC A
          MOV P0,A
          CALL DELAY
          DJNZ R2,LOOP1
          JMP START
DELAY:    MOV R3,#20
D1:       MOV R4,#20
D2:       MOV R5,#248
          DJNZ R5,$
          DJNZ R4,D2
          DJNZ R3,D1
          RET
          END