Periodic function and timer interrupt [easy]

Hello,

I think I have succed to get a 1MHz interrupt with the timer0_34.

I dont change the PLL so I think that I have a 25MHz signal which is on my CPU (I have check all the registers of the PLL and it seems to be ok).

My PRD function has a period of 500ms and I use a software counter to get 1second.

//---------------------------------------------------------
// main.c
//---------------------------------------------------------
#include "INTERRUPT_FULLcfg.h"			//BIOS include file
#include "framework.h"

int sec_cnt=0;
double freq_cnt=0;

void configureTimer0(void);
	
void main(void)
{
	initAll();
	configureTimer0(); //configureTimer0();
//	configureTimer1();	
	return;  		// return to BIOS scheduler
}

void dipPRD(void)
{
	LED_toggle(LED_1);
	LED_toggle(LED_2);
	
	sec_cnt++;
	if(sec_cnt == 2)
	{
		sec_cnt = 0;
	//	printf("cnt value ; %d",freq_cnt);
		freq_cnt = 0;
	}
}
//---------------------------------------------------------
//---------------------------------------------------------
void intFct0(void)
{
	freq_cnt = freq_cnt+1;
}



void configureTimer0(void)
{						 //HWI_INT5, interrupt selection numbber = 64 (Timer64P0 Interrupt34) 
	

	
	TMR0->GPDATA_GPDIR = GPDIRO12 | GPDIRI12; // disable all related interrupts
	
	
	TMR0->TGCR = 0x00000000; // stop and reset timer 0
	TMR0->TCR = 0x00000000;
	
	// config timer0 in 32-bit unchained mode, remove timer0 (3:4) from reset
	SETBIT(TMR0->TGCR, PRESCALER(1) | TIMMODE_32BIT_UNCHAINED | TIM34RS );
	
	// config timer 0 3:4 timer and period registers 0x
	TMR0->TIM34 = 0x00000000;
	TMR0->PRD34 = 0x00000018; //count up to 24
	
	SETBIT(TMR0->TCR, ENAMODE34_CONT); // start timer0 3:4, continuous mode
}

on a breakpoint in "if(sec_cnt == 2) {" the value of freq_cnt is 480019.0, close to 500k

and I want 1MHz

Where am I wrong?

Thank you very much

Simon.