AN3422 datasheet(37/52 Pages) STMICROELECTRONICS

37 / 52 page

AN3422

Peripheral migration

Doc ID 018976 Rev 2

37/52

4.12

RTC

The STM32L1 series embeds a new RTC peripheral vs. F1 series; the architecture, features

and programming interface are different.

As consequence the L1 RTC programming procedures and registers are different from the

the F1 series, so any code written for the F1 series using the RTC needs to be rewritten to

run on L1 series.

The L1 RTC provides best-in-class features:

●

BCD timer/counter

●

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

●

Two programmable alarm interrupts

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Digital calibration circuit

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Time-stamp function for event saving

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Periodic programmable wakeup flag with interrupt capability

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Automatic wakeup unit to manage low power modes

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32 backup registers (128 bytes) which are reset when a tamper detection event occurs

For more information about STM32L1’s RTC features, please refer to RTC chapter of

STM32L1xx Reference Manual (RM0038).

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

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

AN3422 Datasheet(PDF) 37 Page - STMicroelectronics