INCLUDE"P16F690.INC" ;实验内容:上电后,RC0口点亮．接着RC0－RC3口的灯左循环三次,然后接着右循环三次,依次周而复始循环.
COUNTER EQU 41H
ORG 0000H
NOP
BSF STATUS,RP0
CLRF TRISC
BCF STATUS,RP0
CLRF PORTC
ST MOVLW 01H ;将01送往W
MOVWF PORTC ;为何PORTC中没有01,或为别的数?
MOVLW 03H
MOVWF 41H
LOOP1 RLF PORTC
CALL DELAY1S
DECFSZ 41H
GOTO LOOP1
MOVLW 03H
MOVWF 41H
LOOP2 RRF PORTC
CALL DELAY1S
DECFSZ 41H
GOTO LOOP2
GOTO ST
DELAY1S MOVLW 0EAH
MOVWF 42H
L0 MOVLW 09AH
MOVWF 43H
L1 MOVLW 07AH
MOVWF 44H
L2 DECFSZ 44H
GOTO L2
DECFSZ 43H
GOTO L1
DECFSZ 42H
GOTO L0
RETURN
END |
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