Trích:
Nguyên văn bởi 222222222
PROCESSOR P16F877A
INCLUDE <P16F877A.INC>
_CONFIG H'3F10'
ORG 0X0000
GOTO START
START BSF STATUS,5
CLRF TRISB
BCF STATUS,5
CLRF PORTB
LOOP MOVLW B'00000001'
MOVWF PORTB
CALL DELAY2
MOVLW B'00000010'
MOVWF PORTB
CALL DELAY2
MOVLW B'00000100'
MOVWF PORTB
CALL DELAY2
MOVLW B'00001000'
MOVWF PORTB
CALL DELAY2
MOVLW B'00010000'
MOVWF PORTB
CALL DELAY2
MOVLW B'00100000'
MOVWF PORTB
CALL DELAY2
MOVLW B'01000000'
MOVWF PORTB
CALL DELAY2
MOVLW B'10000000'
MOVWF PORTB
CALL DELAY2
GOTO LOOP
DELAY1 MOVLW .166
MOVLW 20H
LOOP1 DECFSZ 20H
GOTO LOOP1
RETURN
DELAY2 MOVLW .40
MOVWF 21H
LOOP2 CALL DELAY1
DECFSZ 21H
GOTO LOOP2
RETURN
END
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