Note: In addition to the Hibernation signals that are part of the Hibernation Module, GPIO pins
K[7:4] can be configured as external wake sources. Refer to “Waking from
Hibernate” on page 546 for more information.
Note: Port pins PM[7:4] operate as Fast GPIO pads but support only 2-, 4-, 6-, and 8-mA drive
capability. 10- and 12-mA drive are not supported. All standard GPIO register controls,
except for the GPIODR12R register, apply to these port pins. Refer to “General-Purpose
Input/Outputs (GPIOs)” on page 742 and “Recommended GPIO Operating
Characteristics” on page 1820 for more information.
Table 7-1. Hibernate Signals (128TQFP)
DescriptionBuffer TypePin TypePin Mux / Pin
Assignment
Pin NumberPin Name
An output that indicates the processor is in
Hibernate mode.
TTLOfixed65HIB
Buffered version of the Hibernation module's
32.768-kHz clock. This signal is not output when
the part is in Hibernate mode and before being
configured after power-on reset.
TTLOPC5 (7)
PK7 (5)
PP3 (7)
24
60
104
RTCCLK
Tamper signal 0.TTLI/OPM771TMPR0
Tamper signal 1.TTLI/OPM672TMPR1
Tamper signal 2.TTLI/OPM573TMPR2
Tamper signal 3.TTLI/OPM474TMPR3
Power source for the Hibernation module. It is
normally connected to the positive terminal of a
battery and serves as the battery
backup/Hibernation module power-source supply.
Power-fixed68VBAT
An external input that brings the processor out of
Hibernate mode when asserted.
TTLIfixed64WAKE
Hibernation module oscillator crystal input or an
external clock reference input. Note that this is
either a crystal or a 32.768-kHz oscillator for the
Hibernation module RTC.
AnalogIfixed66XOSC0
Hibernation module oscillator crystal output. Leave
unconnected when using a single-ended clock
source.
AnalogOfixed67XOSC1
7.3 Functional Description
The Hibernation module provides two mechanisms for power control:
■ The first mechanism uses internal switches to control power to the Cortex-M4F as well as to
most analog and digital functions while retaining I/O pin power (VDD3ON mode).
■ The second mechanism controls the power to the microcontroller with a control signal (HIB) that
signals an external voltage regulator to turn on or off.
The Hibernation module power source is supplied by V
DD
as long as it is within a valid range, even
if V
BAT
>V
DD
. The Hibernation module also has an independent clock source to maintain a real-time
clock (RTC) when the system clock is powered down. Hibernate mode can be entered through one
of two ways:
June 18, 2014534
Texas Instruments-Production Data
Hibernation Module
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