Technical Reference Manual
002-29852 Rev. *B
1.1 Register Details
1.1.1 BACKUP_CTL
Description:
Control
Address:
0x40270000
Offset:
0x0
Retention:
Retained
IsDeepSleep:
No
Comment:
These bits are in vddbak domain.
Default:
0x0
Bit-field Table
Bits
7
6
5
4
3
2
1
0
Name
None [7:4]
WCO_EN
[3:3]
None [2:0]
Bits
15
14
13
12
11
10
9
8
Name
None [15:14]
PRESCALER [13:12]
None [11:10]
CLK_SEL [9:8]
Bits
23
22
21
20
19
18
17
16
Name
None [23:20]
VBACKUP
_MEAS
[19:19]
VDDBAK_CTL [18:17]
WCO
_BYPASS
[16:16]
Bits
31
30
29
28
27
26
25
24
Name
EN_CHARGE_KEY [31:24]
Bit-fields
Bits Name
SW
HW
Default or
Enum
Description
3
WCO_EN
RW
A
0
Watch-crystal oscillator (WCO) enable. If there is a
write in progress when this bit is cleared, the WCO will
be internally kept on until the write completes.
After enabling the WCO software must wait until
STATUS.WCO_OK=1 before configuring any
component that depends on clk_lf/clk_bak, like for
example RTC or WDTs. Follow the procedure in
BACKUP_RTC_RW to access this bit.
8:9
CLK_SEL
RW
A
0
Clock select for RTC clock
WCO
0
Watch-crystal oscillator input, available in Active,
DeepSleep, Hibernate, and XRES.
ALTBAK
1
This allows to use the LFCLK selection as an alternate
backup domain clock. Note that LFCLK is only
available in Active and DeepSleep power modes.
Note that LFCLK clock glitches can propagate into the
backup logic when the clock is stopped. For this
reason, if the WCO or ILO is intended as the clock
source then choose it directly instead of routing
through LFCLK.
ILO
2
Internal Low frequency Oscillator, available in Active,
DeepSleep, Hibernate, and XRES.
For Hibernate operation CLK_ILO_CONFIG.
ILO_BACKUP must be set. If there are multiple ILO,
this is ILO0.
LPECO_PRESCALER
3
Low-power external crystal oscillator prescaler output,
available in Active, DeepSleep, Hibernate, and XRES.
9
2022-04-18
TRAVEO™ T2G Automotive MCU: TVII-B-E-4M body controller entry registers