/* Registers a callback. 
Registers and enable a callback function which is implemented by the user. */
void aon_sleep_timer_register_callback(aon_sleep_timer_callback_t fun)
/* Registers a callback. 
Registers and enable a callback function which is implemented by the user. */
void aon_sleep_timer_register_callback(aon_sleep_timer_callback_t fun)
{
	aon_sleep_timer_callback = fun;
}