RB0－正转按钮 RB1－反转按钮 RB2－停止按钮 RD0－电动机正转 RD1－电动机反转
程序：
INCLUDE”P16F877”.INC
ORG 0000H
NOP
BSF STATUS,RPO
MOVLW 00H
MOVWF TRISD
MOVLW 07H
MOVWF TRISB
BCF STATUS,RP0
CLRF PORTD
ST NOP
N1 BTFSS PORTB,0
GOTO N3
CALL DELAY10MS
BTFSS PORTB,0
GOTO N3
N2 BTFSC PORTD,1
GOTO N3
BCF PORTD,1
BSF PORTD,0
N3 BTFSS PORTB,1
GOTO N5
CALL DELAY10MS
BTFSS PORTB,1
GOTO N5
N4 BTFSS PORTD,0
GOTO N5
BCF PORTD,0
BSF PORTD,1
N5 BTFSS PORTB,2
GOTO N1
CALL DELAY10MS
BTFSS PORTB,2
GOTO N1
BCF PORTD,0
BCF PORTD,1
GOTO ST
DELAY10MS MOVLW 0DH
MOVWF 20H
LOOP1 MOVLW 0FFH
MOVWF 21H
LOOP2 DECFSZ 21H
GOTO LOOP2
DECFSZ 20H
GOTO LOOP1
RETURN
END
;我是新手，写的不好不要见笑
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