Application of PIC interrupt (I)-EEWORLD

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//Application of interruption (I)

//★★★★★★★★★Application of interruption (I) ★★★★★★★★★★★\\
//MCU model: PIC16F877A
//Function description: Use interrupt timing to make the RC port light a marquee.

#include
__CONFIG(0xf73A); //Chip configuration word
char i;

//===========================================================================
//Function description: timed interrupt service
//Function name: interrupt TimeInt(void)

void interrupt TimeInt(void)
{
     i--;
     if(i>6)
     {
     PORTC=PORTC<<1; //Display shift left one bit (RC0-->RC7-->RC0)
     }
     else
     {
     PORTC=PORTC>>1; //Display shift right one bit
     if(i<1)
     { i=14;}
     }

TMR0 = 0x3d; //timing initial value
T0IF = 0; //clear flag
}

//===========================================================================
//Function description: interrupt setting initialization
//Function name: void IdsInit(void)

void IdsInit(void)
{
     OPTION = 0x87; //Division factor
     TMR0 = 0x3d; //Timing initial value
     T0IE = 1; //Start timing
     GIE = 1; //Enable interrupt
}

//Main program
main()
{
    TRISC=0x00;
    TRISA=0x00;
    TRISD=0x00;
    PORTC=0x01;
    i=14;
    IdsInit(); //Interrupt setting initialization
while(1)
{;}
}

Keywords：PIC Reference address：Application of PIC interrupt (I)

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