LM3S1W16 Datasheet, PDF (264/794 Pages) Texas Instruments – Stellaris® LM3S1W16 Microcontroller

Hibernation Module
6 Hibernation Module
The Hibernation Module manages removal and restoration of power to provide a means for reducing
power consumption. When the processor and peripherals are idle, power can be completely removed
with only the Hibernation module remaining powered. Power can be restored based on an external
signal or at a certain time using the built-in Real-Time Clock (RTC). The Hibernation module can
be independently supplied from a battery or an auxiliary power supply.
The Hibernation module has the following features:
■ 32-bit real-time counter (RTC)
– Two 32-bit RTC match registers for timed wake-up and interrupt generation
– RTC predivider trim for making fine adjustments to the clock rate
■ Two mechanisms for power control
– System power control using discrete external regulator
– On-chip power control using internal switches under register control
■ Dedicated pin for waking using an external signal
■ RTC operational and hibernation memory valid as long as V_BAT is valid
■ Low-battery detection, signaling, and interrupt generation
■ Clock source from a 32.768-kHz external oscillator or a 4.194304-MHz crystal; 32.768-kHz
external oscillator can be used for main controller clock
■ 64 32-bit words of battery-backed memory to save state during hibernation
■ Programmable interrupts for RTC match, external wake, and low battery events
264
January 21, 2012
Texas Instruments-Production Data