AN3427 datasheet(36/52 Pages) STMICROELECTRONICS

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Peripheral migration

AN3427

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Doc ID 019001 Rev 1

3.11

RTC

The STM32 F2 series embeds a new RTC peripheral vs. F1 series; the architecture,

features and programming interface are different.

As a consequence the F2 RTC programming procedures and registers are different from the

the F1 series, i.e. any code on F1series using the RTC needs to be rewritten to run on F2

series.

This new RTC provides best-in-class features:

●

BCD timer/counter

●

Time-of-day clock/calendar with programmable daylight saving compensation

●

Two programmable alarm interrupts

●

Digital calibration circuit

●

Time-stamp function for event saving

●

Periodic programmable wakeup flag with interrupt capability

●

Automatic wakeup unit to manage low power modes

●

20 backup registers (80 bytes) which are reset when a tamper detection event occurs.

For more information about STM32 F2’s RTC features, please refer to RTC chapter of

STM32F2xx Reference Manual (RM0033).

For advanced information about the RTC programming, please refer to the Application Note

AN3371 Using the STM32 HW real-time clock (RTC).

Wake-up

sources

Sleep mode:

– Any peripheral interrupt/wakeup event

Stop mode:

– Any EXTI line event/interrupt

Standby mode:

– WKUP pin rising edge

–RTC alarm

– External reset in NRST pin

– IWDG reset

Sleep mode:

– Any peripheral interrupt/wakeup event

Stop mode:

– Any EXTI line event/interrupt

Standby mode:

– WKUP pin rising edge

– RTC alarm A, RTC alarm B, RTC Wakeup, Tamper

event, TimeStamp event

– External reset in NRST pin

– IWDG reset

Configuration

In F2 two additional bits have been added:

– PWR_CR[FPDS] used to power down the Flash in

Stop mode

– PWR_CSR[BRE] used to enable/disable the Backup

regulator

Table 12.

PWR differences between STM32 F1 series and STM32 F2 series

PWR

STM32 F1 series

STM32 F2 series

Color key:

= New feature or new architecture

= Same feature, but specification change or enhancement

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