Texas Instruments TM4C1294NCPDT User Manual

DescriptionResetTypeNameBit/Field
GPIO Retention/Clear
This bit is used when the VDD3ON bit is set.This bit is must be set when
entering the hibernate state when the VDD3ON bit is set. This does not
affect behavior when VDD3ON is clear.
Note: This bit must be set when enabling VDD3ON mode.
DescriptionValue
GPIO retention is released when power is reapplied. The GPIOs
are initialized to default values.
0
GPIO retention set until software clears this bit.1
0RWRETCLR30
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0ROreserved29:20
Oscillator Select
This bit is used to select between the use of an external 32.768-kHz
source or the HIB internal low frequency oscillator (HIB LFIOSC).
Note: To enable the HIB LFIOSC, CLK32EN must be programmed
to 1 at the same time the OSCSEL bit is set. Thus the HIBCTL
register should be written with 0x0008.0040
DescriptionValue
External 32.786-kHZ clock source is enabled.0
HIB Low frequency oscillator (HIB LFIOSC) is enabled.1
Note: The HIB low-frequency oscillator has a wide frequency
variation, therefore the RTC is not accurate when using this
clock source.
0RWOSCSEL19
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0ROreserved18
Oscillator Drive Capability
This bit is used to compensate for larger or smaller filtering capacitors.
Note: This bit is not meant to be changed once the Hibernation
oscillator has started. Oscillator stability is not guaranteed if
the user changes this value after the oscillator is running.
DescriptionValue
Low drive strength is enabled, 12 pF.0
High drive strength is enabled, 24 pF.1
0RWOSCDRV17
Oscillator Bypass
DescriptionValue
The internal 32.768-kHz Hibernation oscillator is enabled. This
bit should be cleared when using an external 32.768-kHz crystal.
0
The internal 32.768-kHz Hibernation oscillator is disabled and
powered down. This bit should be set when using a single-ended
oscillator attached to XOSC0.
1
0RWOSCBYP16
June 18, 2014558
Texas Instruments-Production Data
Hibernation Module

Texas Instruments TM4C1294NCPDT Specifications

General

Brand	Texas Instruments
Model	TM4C1294NCPDT
Category	Microcontrollers
Language	English