TM4C129ENCZAD Datasheet, PDF (572/2037 Pages) Texas Instruments – Tiva Microcontroller

Hibernation Module
Bit/Field
3
2
1
0
Name
RTCWEN
reserved
HIBREQ
RTCEN
Type
RW
RO
RW
RW
Reset
0
Description
RTC Wake-up Enable
Value
0
1
Description
An RTC match event has no effect on hibernation.
An RTC match event (the value the HIBRTCC register
matches the value of the HIBRTCM0 register and the value
of the RTCSSC field matches the RTCSSM field in the
HIBRTCSS register) takes the microcontroller out of
hibernation.
0
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.
0
Hibernation Request
Value
0
1
Description
No hibernation request.
Set this bit to initiate hibernation.
After a wake-up event, this bit is automatically cleared by hardware.
A hibernation request is ignored if both the PINWEN and RTCWEN bits
are clear.
0
RTC Timer/Calendar Enable
This is bit must be set to enable RTC or calendar mode. For calendar
mode enable, the CALEN bit in the HIBCALCTL register must also be
set.
Value
0
1
Description
The Hibernation module RTC and calendar mode are
disabled.
The Hibernation module RTC and calendar mode are
enabled.
Note:
The low-frequency oscillator has a wide frequency variation,
therefore the RTC is not accurate when using this clock
source.
572
June 18, 2014
Texas Instruments-Production Data