TM4C129DNCPDT Datasheet, PDF (287/1946 Pages) Texas Instruments – Tiva Microcontroller

Tiva^™ TM4C129DNCPDT Microcontroller
Register 14: Deep Sleep Clock Configuration Register (DSCLKCFG), offset
0x144
The DSCLKCFG register specifies the behavior of the clock system while in deep sleep.
Note that the MOSCDPD bit not only affects deep-sleep mode, but all other modes as well depending
on the value of the bit. Please refer to the following table when programming this bit:
Table 5-13. MOSC Configurations
PWRDN bit MOSCDPD field
Result
0
0
MOSC is powered ON in run and sleep modes, but is disabled in accidental power down,
when the PWRDN bit is set in the MOSCCTL register, or in deep-sleep mode only if it is not
the deep-sleep clock source (DSOSCSRC !==0x3).
0
1
MOSC is powered and running in run, sleep and deep-sleep modes.
1
0
MOSC is powered off, and does not run in any mode. Please note, that in this configuration,
when the MOSC is disabled, the MOSC must not be chosen as a clock source or indeterminate
results occur.
1
1
MOSC runs and does not disable itself in run, sleep, and deep-sleep modes regardless of
the fact that the PWRDN bit is set.
Note: The MOSCDPD bit has an effect in all modes of operation
Note:
If the MOSC is chosen as the Deep-Sleep clock source in the DSCLKCFG register, the
MOSC must also be configured as the Run and Sleep clock source in the RSCLKCFG
register prior to entering Deep Sleep. If the PIOSC, LFIOSC, or Hibernation RTC Module
Oscillator (HIBLFIOSC or 32-kHz crystal) is configured as the Run and Sleep clock source
in the RSCLKFCFG register, and the MOSC is configured as the Deep-Sleep clock source
in the DSCLKCFG register, then two outcomes are possible:
■ If the PIOSC is still powered in Deep Sleep (using the PIOSCPD bit in the DSCLKCFG
register) then the PIOSC is utilized as the clock source when entering Deep Sleep and
the device enters and exits the Deep-Sleep state normally. The MOSC is not used as
the clock source in Deep Sleep.
■ If the PIOSC has been configured to be powered down in Deep Sleep, then the device
can enter the Deep-Sleep state, but cannot exit properly. This situation can be avoided
by programming the MOSC as the Run and Sleep clock source in the RSCLKCFG
register prior to entering Deep Sleep.
Deep Sleep Clock Configuration Register (DSCLKCFG)
Base 0x400F.E000
Offset 0x144
Type RW, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
PIOSCPD MOSCDPD
reserved
DSOSCSRC
reserved
Type RW
RW
RO
RO
RO
RO
RO
RO
RW
RW
RW
RW
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
DSSYSDIV
Type RO
RO
RO
RO
RO
RO
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
June 18, 2014
287
Texas Instruments-Production Data