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 also integrates a tamper module which provides mechanisms to detect, respond
to, and log system tampering events. The Tamper module is designed to be low power and operate
from either a battery or the MCU I/O voltage 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
■ Hardware Calendar Function
– Year, Month, Day, Day of Week, Hours, Minutes, Seconds
– Four-year leap compensation
– 24-hour or AM/PM configuration
■ Two mechanisms for power control
– System power control using discrete external regulator
– On-chip power control using internal switches under register control
■ V
DD
supplies power when valid, even if V
BAT
> V
DD
■ Dedicated pin for waking using an external signal
■ Capability to configure external reset (RST) pin and/or up to four GPIO port pins as wake source,
with programmable wake level
■ Tamper Functionality
– Support for four tamper inputs
– Configurable level, weak pull-up, and glitch filter
– Configurable tamper event response
– Logging of up to four tamper events
– Optional BBRAM erase on tamper detection
– Tamper wake from hibernate capability
531June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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