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AN4617

Peripheral migration

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2.16

Real-time clock (RTC) interface

The STM32L0 series embeds an improved RTC peripheral versus the F0 series, however

the architecture, features and programming interface are similar.

The L0 RTC provides additionally:

•

A sub-second programmable alarm

•

16-bit wakeup auto reload timer with interrupt capability (STM32F0x7 devices features

by wakeup timer only)

•

RTC output remapping

•

Low power timer triggering by tamper event

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

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

2.17

SPI interface

The STM32F0 series embeds a new SPI peripheral versus the L0 series. The architecture,

features and programming interface are modified to introduce new capabilities.

As a consequence, the F0 SPI programming procedures and registers are a bit different to

those of the L0 series. The code written for the F0 series using the SPI needs little rework to

run on L0 series and oppositely.

The basic differences are summarized in Table 17:

Low-power

modes

Sleep

Stop

Standby (1.8 V domain

powered-off)

Sleep

Stop

Low power run

Sleep

Low power sleep

Stop

Standby

Wake-up

sources

Sleep

– Any peripheral

interrupt/wakeup event

Stop

– Any EXTI line event/interrupt

Standby

– WKUP0 or WKUP1 pin rising

edge

–RTC alarm

– External reset in NRST pin

– IWDG reset

Sleep

– Any peripheral

interrupt/wakeup event

Stop

– Any EXTI line event/interrupt

Low power run

– switch MR on

Sleep

– Any wakeup or interrupt

Low power sleep

– Any wakeup or interrupt

Stop

– Any EXTI line event/interrupt

Standby

– WKUP pin rising edge

– RTC alarm

–RTC wake up

– External reset in NRST pin

– IWDG reset

Table 16. PWR differences between STM32F0 and STM32L0 series (continued)

PWR

STM32F0x1/2 series

STM32F0x8 series

STM32L0 series