2.53 HTM (Hibernation Timer)

The Hibernation Timer can generate a wake event to the Embedded Controller (EC) when it is in a hibernation mode.

This block supports wake events up to 2 hours in duration. The Hibernation Timer is a 16-bit binary count-down timer that can be programmed in 30.5μs and 0.125 second increments for period ranges of 30.5μs to 2s or 0.125s to 136.5 minutes, respectively. Writing a non-zero value to this register starts the counter from that value. A wake-up interrupt is generated when the count reaches zero.

void htm_timeout_callback(uintptr_t context)
{
    LED0_Toggle();
    
    HTM0_PeriodSet(32768);
}

int main ( void )
{
    /* Initialize all modules */
    SYS_Initialize ( NULL );
    
    HTM0_CallbackRegister(htm_timeout_callback, 0);

    while ( true )
    {
        /* Maintain state machines of all polled MPLAB Harmony modules. */
        SYS_Tasks ( );
    }

    /* Execution should not come here during normal operation */

    return ( EXIT_FAILURE );
}