The real time interrupt (RTI) can use the external clock or 1-kHz (approximately) self-clocked time reference that is completely independent of other MCU clocks or external clock source to produce an interrupt. The RTI can be used to wake the MCU from stop mode, even when the external oscillator and other MCU clocks are stopped to save power, by using the 1-kHz source.

Peripheral Initialization Components provide a low-level hardware approach to initialize registers of the peripheral module. They are intended for experienced users.