MSP432 to slow

Hi,

I'm just starting with msp 432.

I've attached a clock source on a pin and in the interrupt I toggle one other pin. (I need to read some serial data)

Everything works ok if the clock is 10k or below, but if the clock is 100K,1M...+ it seams that the interrupt is not handling correctly.

 I was trying to do the same thing with the TI RTOS but it was the same. I've also tried to handle the data with spi and also the same.. :/

Can you please point me out what I'm doing wrong? 48Mhz processor should handle this easily.

Thank you!

The code is from the interrupt example.

int main(void)
{
    volatile uint32_t ii;

    /* Halting the Watchdog */
    MAP_WDT_A_holdTimer();

    /* Configuring P1.0 as output and P1.1 (switch) as input */
    MAP_GPIO_setAsOutputPin(GPIO_PORT_P2, GPIO_PIN7);

    /* Configuring P1.1 as an input and enabling interrupts */
    MAP_GPIO_setAsInputPinWithPullUpResistor(GPIO_PORT_P1, GPIO_PIN5);
//    MAP_GPIO_setAsInputPin(GPIO_PORT_P1,GPIO_PIN5);
    MAP_GPIO_clearInterruptFlag(GPIO_PORT_P1, GPIO_PIN5);
    MAP_GPIO_enableInterrupt(GPIO_PORT_P1, GPIO_PIN5);

    MAP_Interrupt_enableInterrupt(INT_PORT1);

    /* Enabling SRAM Bank Retention */
    MAP_SysCtl_enableSRAMBankRetention(SYSCTL_SRAM_BANK1);
    
    /* Enabling MASTER interrupts */
    MAP_Interrupt_enableMaster();   

    /* Going to LPM3 */
    while (1)
    {
        MAP_PCM_gotoLPM3();
    }
}

/* GPIO ISR */
void PORT1_IRQHandler(void)
{
    uint32_t status;

    status = MAP_GPIO_getEnabledInterruptStatus(GPIO_PORT_P1);
    MAP_GPIO_clearInterruptFlag(GPIO_PORT_P1, status);

    /* Toggling the output on the LED */
    if(status & GPIO_PIN5)
    {
        MAP_GPIO_toggleOutputOnPin(GPIO_PORT_P2, GPIO_PIN7);
    }

}