RTC_CR field descriptions (continued)
Field
Description
13–10
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
9
CLKO
Clock Output
0
The 32 kHz clock is allowed to output on RTC_CLKOUT.
1
The 32 kHz clock is not allowed to output on RTC_CLKOUT.
8
OSCE
Oscillator Enable
0
32.768 kHz oscillator is disabled.
1
32.768 kHz oscillator is enabled. After setting this bit, wait the oscillator startup time before enabling
the time counter to allow the 32.768 kHz clock time to stabilize.
7
LPOS
LPO Select
When set, the RTC prescaler increments using the LPO clock and not the RTC 32 kHz crystal clock. The
LPO increments the prescaler from bit TPR[5] (TPR[4:0] are ignored), supporting close to 1 second
increment of the seconds register. Although compensation is supported when clocked from the LPO,
TCR[4:0] of the compensation register are also ignored and only TCR[7:5] set the compensation value
(can overflow after 1020 to 1027 cycles).
0
RTC prescaler increments using 32 kHz crystal.
1
RTC prescaler increments using LPO, bits [4:0] of the prescaler are bypassed.
6
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
5
CPS
Clock Pin Select
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.
Table continues on the next page...
Chapter 43 Real Time Clock (SRTC)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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