RM0453 Rev 1 1023/1461
RM0453 Real-time clock (RTC)
1057
32.6.6 RTC wakeup timer register (RTC_WUTR)
This register can be written only when WUTWF is set to 1 in RTC_ICSR.
Address offset: 0x14
Backup domain reset value: 0x0000 FFFF
System reset: not affected
32.6.7 RTC control register (RTC_CR)
This register is write protected. The write access procedure is described in RTC register
write protection on page 1007.
Address offset: 0x18
Backup domain reset value: 0x0000 0000
System reset: not affected
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
WUTOCLR[15:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
WUT[15:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:16 WUTOCLR[15:0]: Wakeup auto-reload output clear value
When WUTOCLR[15:0] is different from 0x0000, WUTF is set by hardware when the auto-
reload down-counter reaches 0 and is cleared by hardware when the auto-reload
downcounter reaches WUTOCLR[15:0].
When WUTOCLR[15:0] = 0x0000, WUTF is set by hardware when the WUT down-counter
reaches 0 and is cleared by software.
Bits 15:0 WUT[15:0]: Wakeup auto-reload value bits
When the wakeup timer is enabled (WUTE set to 1), the WUTF flag is set every
(WUT[15:0] + 1) ck_wut cycles. The ck_wut period is selected through WUCKSEL[2:0] bits
of the RTC_CR register.
When WUCKSEL[2] = 1, the wakeup timer becomes 17-bits and WUCKSEL[1] effectively
becomes WUT[16] the most-significant bit to be reloaded into the timer.
The first assertion of WUTF occurs between WUT and (WUT + 2) ck_wut cycles after WUTE
is set. Setting WUT[15:0] to 0x0000 with WUCKSEL[2:0] = 011 (RTCCLK/2) is forbidden.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
OUT2
EN
TAMP
ALRM_
TYPE
TAMP
ALRM_
PU
Res. Res.
TAMP
OE
TAMP
TS
ITSE COE OSEL[1:0] POL COSEL BKP SUB1H ADD1H
rw rw rw rw rw rw rw rw rw rw rw rw w w
1514131211109876543210
TSIE WUTIE
ALRB
IE
ALRA
IE
TSE WUTE ALRBE ALRAE
SSR
UIE
FMT
BYP
SHAD
REFCK
ON
TS
EDGE
WUCKSEL[2:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
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