8H       ;9
        RETLW 7FH                   ;.
        RETLW 00H
;*******************************************************
MAIN
            CLRF PORTA              ;初始化IO口
            CLRF PORTC              ;
    
            BSF STATUS,RP0          ;设置RA，RC口全部为输出
            MOVLW 07H
            MOVWF ADCON1            ;设置RA口全部为普通数字IO口
            MOVLW 00H
            MOVWF TRISA             ;
            MOVWF TRISC
            MOVLW  0FFH
            MOVWF TRISB
            MOVLW 00000100B
            MOVWF OPTION_REG    ;预分频器分配给定时器0，分频比1:32
            BCF STATUS,RP0

            MOVLW 155
            MOVWF RTCC         ;定时器送初值(255-155)*32US=3.2MS,每3.2MS一次中断
            MOVLW 0FFH         ;先让数码管全部不显示
            MOVWF PORTC
            MOVLW 06H
            MOVWF DISP_COUNT
            CLRW
            MOVWF DISPBUFF_1
            MOVLW 1
            MOVWF DISPBUFF_0
            MOVLW 2
            MOVWF DISPBUFF_3
            MOVLW 3
            MOVWF DISPBUFF_2
            MOVLW 4
            MOVWF DISPBUFF_5
            MOVLW 5
            MOVWF DISPBUFF_4
           
            BCF INTCON,T0IF
            BSF INTCON,T0IE    ;定时器0溢出中断允许
            BSF INTCON,GIE      ;总中断允许
;----------------------
LOOPA       BTFSS PORTB,1
     &nb