TM4C1231D5PM Datasheet, PDF (458/1145 Pages) Texas Instruments – Tiva™ TM4C1231D5PM Microcontroller

Hibernation Module
7 Hibernation Module
The Hibernation Module manages removal and restoration of power to provide a means for reducing
system 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 an external battery or an auxiliary power supply.
The Hibernation module has the following features:
■ 32-bit real-time seconds counter (RTC) with 1/32,768 second resolution and a 15-bit sub-seconds
counter
– 32-bit RTC seconds match register and a 15-bit sub seconds match for timed wake-up and
interrupt generation with 1/32,768 second resolution
– 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_DD or V_BAT is valid
■ Low-battery detection, signaling, and interrupt generation, with optional wake on low battery
■ GPIO pin state can be retained during hibernation
■ Clock source from a 32.768-kHz external crystal or oscillator
■ Sixteen 32-bit words of battery-backed memory to save state during hibernation
■ Programmable interrupts for:
– RTC match
– External wake
– Low battery
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June 12, 2014
Texas Instruments-Production Data