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RTC_CR field descriptions (continued)
Field
Description
0
The prescaler output clock (as configured by TSIC) is output on RTC_CLKOUT.
1
The RTC 32kHz crystal clock is output on RTC_CLKOUT.
4
WPS
Wakeup Pin Select
The wakeup pin is optional and not available on all devices.
0
Wakeup pin asserts (active low, open drain) if the RTC interrupt asserts or the wakeup pin is turned
on.
1
Wakeup pin instead outputs the RTC 32kHz clock, provided the wakeup pin is turned on and the
32kHz clock is output to other peripherals.
3
UM
Update Mode
Allows SR[TCE] to be written even when the Status Register is locked. When set, the SR[TCE] can always
be written if the SR[TIF] or SR[TOF] are set or if the SR[TCE] is clear.
0
Registers cannot be written when locked.
1
Registers can be written when locked under limited conditions.
2
SUP
Supervisor Access
0
Non-supervisor mode write accesses are not supported and generate a bus error.
1
Non-supervisor mode write accesses are supported.
1
WPE
Wakeup Pin Enable
The wakeup pin is optional and not available on all devices.
0
Wakeup pin is disabled.
1
Wakeup pin is enabled and wakeup pin asserts if the RTC interrupt asserts or the wakeup pin is
turned on.
0
SWR
Software Reset
0
No effect.
1
Resets all RTC registers except for the SWR bit . The SWR bit is cleared by POR and by software
explicitly clearing it.
41.2.6 RTC Status Register (RTC_SR)
Address: 4003_8000h base + 14h offset = 4003_8014h
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Chapter 41 Real Time Clock (RTC)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
1047
Содержание K32 L2A Series
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