#ifndef __PIC18F4580_h

#define __PIC18F4580_h

#include

#include

#include

#include

#include

#define InterruptEnable  INTCONbits.PEIE = 1,INTCONbits.GIE = 1

#define InterruptDisable INTCONbits.PEIE = 0,INTCONbits.GIE = 0

extern void IntTimer0(void);

#endif

--------------------------------------------------------------------------------------

#include"PIC18F4580.h"

#pragma interrupt SelectHPrioInt

#pragma code HiPrio_Int = 0x08

void HighPrioInt(void)

{

 _asm

  goto SelectHPrioInt

 _endasm

}

#pragma code

void SelectHPrioInt (void)

{

 if(INTCONbits.TMR0IF) 

 {

  IntTimer0(); 

 }

}

---------------------------------------------------------------------------------------------

#include"PIC18F4580.h"

#pragma config OSC =IRCIO67, WDTPS = 1024, WDT = ON,PBADEN = OFF,DEBUG = OFF,MCLRE = OFF,LVP = OFF

#define u16 unsigned int

#define u8 unsigned char

#define LED LATCbits.LATC2

void WdtReset(void)

{

 _asm

  CLRWDT

 _endasm

}

void delay_n_ms(u16 n)//8MHz时钟下的ms延时

{

 T1CON = 0xB0; //16位定时器，系统8分频

    while(n!=0)

    {

        TMR1L = 0x31;

     TMR1H = 0xF8;

        PIR1bits.TMR1IF = 0;   //标志位清空

     T1CONbits.TMR1ON = 1;  //使能定时器

        n--;

        while(!PIR1bits.TMR1IF){;}

        T1CONbits.TMR1ON =0; //关闭定时器

    }

}

void InitTimer0(void)

{

 T0CON = 0x05; //系统64分频

 TMR0L = 0XEF; //1秒中断

 TMR0H = 0x85;

 INTCONbits.TMR0IE = 1;  //打开定时器0中断

 INTCON2bits.TMR0IP = 1; //设置优先级为最高

 T0CONbits.TMR0ON =1;    //打开定时器0

 INTCONbits.TMR0IF = 0;  //标志位清空

 T0CONbits.TMR0ON = 1;

}

void IntTimer0(void)

{ 

 TMR0L = 0XEF;

 TMR0H = 0x85;

 T0CONbits.TMR0ON =1;

 LED=~LED;

    WdtReset();

 INTCONbits.TMR0IF = 0;

}

void main(void)

{

    OSCCON = 0x72;//OSCCON = 0x72;设置OSC时钟输出=8M

                  //OSCCON = 0x62;设置OSC时钟输出=4M

                  //OSCCON = 0x52;设置OSC时钟输出=2M

                  //OSCCON = 0x42;设置OSC时钟输出=1M

                  //OSCCON = 0x32;设置OSC时钟输出=500KHz

                  //OSCCON = 0x22;设置OSC时钟输出=250KHz

                  //OSCCON = 0x12;设置OSC时钟输出=125KHz

                  //OSCCON = 0x02;设置OSC时钟输出=31KHz(from either INTOSC/256 or INTRC directly)

    InterruptDisable;

    InitTimer0();

    InterruptEnable;

    TRISC=0X00; //TRISC寄存器被赋值，PORTC每一位都为输出

    LED=0;

    for(;;)

    {

        //LED=0;

        //delay_n_ms(500);

        //LED=1;

        //delay_n_ms(500);

    }

}