AN4088 datasheet(35/71 Pages) STMICROELECTRONICS

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AN4088

Peripheral migration

3.12

Real-time clock (RTC) interface

The STM32F0 series embeds a new RTC peripheral versus the STM32F1 series. The

architecture, features and programming interface are different.

As a consequence, the STM32F0 RTC programming procedures and registers are different

from those of the STM32F1 series, so any code written for the STM32F1 series using the

RTC needs to be rewritten to run on STM32F0 series.

The STM32F0 RTC provides best-in-class features:



BCD timer/counter



Time-of-day clock/calendar featuring subsecond precision with programmable daylight

saving compensation



Automatic wake-up unit generating a periodic flag that triggers an automatic wake-up

interrupt



A programmable alarm



Digital calibration circuit



Time-stamp function for event saving



Accurate synchronization with an external clock using the subsecond shift feature.



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

For more information about STM32F0 RTC features, please refer to RTC chapter of

STM32F0xx Reference Manual (RM0091).

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

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

3.13

SPI interface

The STM32F0 series embeds a new SPI peripheral versus the STM32F1 series. The

architecture, features and programming interface are modified to introduce new capabilities.

As a consequence, the STM32F0 SPI programming procedures and registers are similar to

those of the STM32F1 series but with new features. The code written for the STM32F1

series using the SPI needs little rework to run on STM32F0 series, if it did not use new

capabilities.

The STM32F0 SPI provides best-in-class added features:



Enhanced NSS control - NSS pulse mode (NSSP) and TI mode



Programmable data frame length from 4-bit to 16-bit



Two 32-bit Tx/Rx FIFO buffers with DMA capability and data packing access for frames

fitted into one byte (up to 8-bit)



8-bit or 16-bit CRC calculation length for 8-bit and 16-bit data.

Furthermore, the SPI peripheral, available in the STM32F0 family, fixes the CRC limitation

present in the STM32F1 family product. For more information about STM32F0 SPI features,

please refer to SPI chapter of STM32F0xx Reference Manual (RM0091).

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