oto lop movlw 0fdh;键值判断并送显 movwf portb nop nop btfss portb,4 goto s4 btfss portb,5 goto s3 movlw 0fbh movwf portb nop nop btfss portb,4 goto s2 btfss portb,5 goto s1s3 movlw .3 movwf count call read movwf portc goto lops4 movlw .4 movwf count call read movwf portc goto lops2 movlw .2 movwf count call read movwf portc goto lop