led.asm

PIC单片计机设计~基于MPLAB的LED程序设计.

      BSF       STATUS,5
      MOVLW     01H
      MOVWF     TRISB
      BCF       STATUS,5
LOOP  BTFSS     PORTB,0
      GOTO      LOOP
      PAGESEL   DELAY10MS
      CALL      DELAY10MS
      PAGESEL   LOOP
      BTFSS     PORTB,0
      GOTO      LOOP
PPA   BTFSC     PORTB,0
      GOTO      PPA
      PAGESEL   DELAY10MS
      CALL      DELAY10MS
      PAGESEL   PPA
      BTFSC     PORTB,0
      GOT0      PPA
      

DELAY10MS  MOVLW  0DH
           MOVWF  20H
LOOP1      MOVLW  0FFH
           MOVWF  21H
LOOP2      DECFSZ 21H
           GOTO   LOOP2
           DECFSZ 20H
           GOTO   LOOP1
           RETURN
           
           END