Ngắt trên C18

[dientu90]

Mọi người cho mình hỏi,mình viết đoạn chuơng trình này để test thử ngắt Timer2 cho PIC18F46K20 sử dụng C18 nhưng không hiểu sao chuơng trình lại không nhảy được vào ngắt,mặc dù mình đã cấu hình đầy đủ rồi
Code:

#include "p18f46k20.h"
//#include "..\h\Delay.h"

/** C O N F I G ****************************************************/

#pragma config FOSC = INTIO67      	// Set thach anh noi, voi RA6&7 la chan IO
#pragma config FCMEN = OFF         	// Tat che do giam sat loi bo dao dong
#pragma config LPT1OSC = OFF      	// Ko dung nguon dao dong tu Timer1
#pragma config HFOFST = OFF			// Fast Start-upHFINTOSC starts clocking the CPU without waiting for the oscillator to stablize.
#pragma config IESO = OFF         	// Ko cho phep chuyen bo dao dong noi<->ngoai

#pragma config PWRT = OFF
#pragma config PBADEN = OFF

#pragma config BOREN = OFF
#pragma config BORV = 18         	// Reset khi dien ap xuong duoi 3.0V

#pragma config LVP = OFF

#pragma config WDTEN = OFF         	// k dung Watch Dog Timer 
#pragma config WDTPS = 64
#pragma config MCLRE = OFF         	//ko Su dung chan Reset, io RE is enable
#pragma config STVREN = OFF         // Stack full will cause Reset
#pragma config XINST = OFF

#pragma config CPD = OFF

#pragma config CP0 = ON
#pragma config CP1 = ON
#pragma config CP2 = ON
#pragma config CP3 = ON

/** P R O T O T Y P E S ********************************************/

void InitializeBoard(void);
void InitTimer2(void);
void high_isr (void);
unsigned char count=0;

/*****************High priority interrupt vector **************************/
#pragma code high_vector=0x08
void interrupt_at_high_vector(void)
{
  _asm GOTO high_isr _endasm
}

#pragma code
/*****************High priority ISR **************************/

#pragma interrupt high_isr
void high_isr ()
{		
	if((PIR1bits.TMR2IF==1))
	{	
		PIR1bits.TMR2IF = 0;
		T2CONbits.TMR2ON = 0;
		TMR2 = 0x00;
		count++;
		if(count == 10 )
		{
	    //ClrWdt();
	    PORTD=0xff;
		//count = 0;
		}
		T2CONbits.TMR2ON = 1;
	}
	
}


void main (void)
{
	
	InitTimer2();
	InitializeBoard();
	while(1)
	{	
	}
}

void InitializeBoard(void)
{
#if(Fosc == 32000000u)
	OSCCON = 0b11100000;
#elif(Fosc == 64000000u)
	OSCCON = 0b11110000;
#endif
    OSCTUNEbits.PLLEN = 1;                     // turn on the PLL 16*4
    OSCTUNE = 0xc0;
    //while(!OSCCONbits.OSTS) ClrWdt();
    //while(!OSCCONbits.IOFS) ;
    
    SLRCON = 0xff;
    ANSEL = 0xff;
    ANSELH = 0xff;
    
    TRISA = 0x00;
	TRISB = 0x00;
	TRISD = 0x00;
	TRISE = 0x00;
	TRISC = 0x80;
	
	LATA = 0x00;
	LATB = 0x00;
	LATD = 0x00;
	LATE = 0x00;
	LATC = 0x00;
	
	INTCON = 0x00;
	INTCON2 = 0x00;
	INTCON3 = 0x00;
	PIE1 = 0x00;
	PIE2 = 0x00;
   	   	
}
void InitTimer2(void)
{

	/*********Timer 2*****************/   
	T2CONbits.T2OUTPS3 = 0;
	T2CONbits.T2OUTPS2 = 0;
	T2CONbits.T2OUTPS1 = 0;
	T2CONbits.T2OUTPS0 = 0;   
	T2CONbits.T2CKPS0 = 0; 
	T2CONbits.T2CKPS1 = 0;    
   	   	
	PIR1bits.TMR2IF = 0;
	PIE1bits.TMR2IE = 1;
	IPR1bits.TMR2IP = 1;
	
	TMR2 = 0x00;
	
	T2CONbits.TMR2ON = 1;
	
	RCON = 0x0f;
	RCONbits.IPEN = 1;
   	INTCONbits.GIEH = 1;
   	INTCONbits.PEIE = 1;

}