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ST STM32WL5 Series User Manual

ST STM32WL5 Series
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Contents RM0453
32/1461 RM0453 Rev 1
32.3.4 Clock and prescalers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1003
32.3.5 Real-time clock and calendar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1005
32.3.6 Calendar ultra-low power mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1005
32.3.7 Programmable alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1005
32.3.8 Periodic auto-wakeup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1006
32.3.9 RTC initialization and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 1007
32.3.10 Reading the calendar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1009
32.3.11 Resetting the RTC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1010
32.3.12 RTC synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1010
32.3.13 RTC reference clock detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1011
32.3.14 RTC smooth digital calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1012
32.3.15 Timestamp function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1014
32.3.16 Calibration clock output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1015
32.3.17 Tamper and alarm output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1015
32.4 RTC low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1016
32.5 RTC interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1017
32.6 RTC registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1018
32.6.1 RTC time register (RTC_TR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1018
32.6.2 RTC date register (RTC_DR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1019
32.6.3 RTC sub second register (RTC_SSR) . . . . . . . . . . . . . . . . . . . . . . . . 1020
32.6.4 RTC initialization control and status register (RTC_ICSR) . . . . . . . . 1020
32.6.5 RTC prescaler register (RTC_PRER) . . . . . . . . . . . . . . . . . . . . . . . . 1022
32.6.6 RTC wakeup timer register (RTC_WUTR) . . . . . . . . . . . . . . . . . . . . . 1023
32.6.7 RTC control register (RTC_CR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1023
32.6.8 RTC write protection register (RTC_WPR) . . . . . . . . . . . . . . . . . . . . 1027
32.6.9 RTC calibration register (RTC_CALR) . . . . . . . . . . . . . . . . . . . . . . . . 1027
32.6.10 RTC shift control register (RTC_SHIFTR) . . . . . . . . . . . . . . . . . . . . . 1028
32.6.11 RTC timestamp time register (RTC_TSTR) . . . . . . . . . . . . . . . . . . . . 1029
32.6.12 RTC timestamp date register (RTC_TSDR) . . . . . . . . . . . . . . . . . . . 1030
32.6.13 RTC timestamp sub second register (RTC_TSSSR) . . . . . . . . . . . . . 1030
32.6.14 RTC alarm A register (RTC_ALRMAR) . . . . . . . . . . . . . . . . . . . . . . . 1031
32.6.15 RTC alarm A sub second register (RTC_ALRMASSR) . . . . . . . . . . . 1032
32.6.16 RTC alarm B register (RTC_ALRMBR) . . . . . . . . . . . . . . . . . . . . . . . 1033
32.6.17 RTC alarm B sub second register (RTC_ALRMBSSR) . . . . . . . . . . . 1034
32.6.18 RTC status register (RTC_SR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1035
32.6.19 RTC masked interrupt status register (RTC_MISR) . . . . . . . . . . . . . 1036
32.6.20 RTC status clear register (RTC_SCR) . . . . . . . . . . . . . . . . . . . . . . . . 1037

Table of Contents

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ST STM32WL5 Series Specifications

General IconGeneral
BrandST
ModelSTM32WL5 Series
CategoryMicrocontrollers
LanguageEnglish

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