list p=16f876
            #include 

;--------------------------
;定時計數(shù)單元
HW_TIME    EQU        0X40
;-----------------------------
;定時常數(shù)
HW_TIMECT0      EQU        0XDF;TMR0定時器時間常數(shù)，載波信號頻率37.88KHz(13.2us)
HW_TIMECT1      EQU        0X64;發(fā)送信號位間隔，*(1.32ms)
HW_TIMECT3      EQU        0X31;
;-------------------------------------
        ORG    0X00        
    GOTO    HW_RECEIVE
;------------------------------------
        ORG     0X04        
        GOTO    INT
;---------------------------------------
bcf    INTCON,GIE
BCF     INTCON,T0IF     ;(T0IF)定時器溢出標志位清零
BCF    INTCON,T0IE     ;關TMR0中斷(T0IE)位清零
BANKSEL    OPTION_REG
CLRF    OPTION_REG    
    BANKSEL    HW_TIME
    MOVLW    HW_TIMECT3
    MOVWF    HW_TIME
        MOVLW   HW_TIMECT0
        MOVWF   TMR0
    BANKSEL    INTCON
    BSF    INTCON,T0IE
    BSF    INTCON,GIE 
INT;中斷
    movwf    W_TEMP
    movf    STATUS,0
    bcf    STATUS,RP0;working in bank0
    movwf    STATUS_TEMP
    MOVLW   HW_TIMECT0
        MOVWF   TMR0         ;重裝定時常數(shù)
        BCF     INTCON,T0IF    ;清除中斷溢出標志位(T0IF)
;----------------------------------------------------------------------
        DECFSZ  HW_TIME,1           ;為零，間跳，定時時間到
        GOTO    HW_LEAVE1
        MOVLW   HW_TIMECT1         ;重裝時間常數(shù)
        MOVWF   HW_TIME
    BSF     HW_Sign,1
HW_LEAVE1
    BANKSEL    STATUS_TEMP
    MOVF    STATUS_TEMP,0
    MOVWF    STATUS
    MOVF    W_TEMP
    RETFIE