AN4228 datasheet(32/90 Pages) STMICROELECTRONICS

32 / 90 page

Peripheral migration

AN4228

32/90

DocID024110 Rev 5

3.12

Real-time clock (RTC) interface

The STM32F3 series embeds a new RTC peripheral versus the STM32F1 series. The

architecture, features and programming interface are different.

As a consequence, the STM32F3 series 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 STM32F3 series.

The STM32F3 series RTC provides best-in-class features:



BCD timer/counter



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

saving compensation



Two programmable alarms



Digital calibration circuit



Time-stamp function for event saving



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



STM32F30xx/STM32F37xx feature 16 and 32 backup registers, respectively (64 and

128 bytes) which are reset when a tamper detection event occurs

For more information about STM32F3’s RTC features, please refer to RTC chapter of

STM32F30/31xx and STM32F37/38xx Reference Manuals (RM0316 and RM0313).

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 STM32F3 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 STM32F3 series 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 STM32F3 series, if it did not use

new capabilities.

The STM32F3 series 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 STM32F3 series, fixes the CRC limitation

present in the STM32F1 series. For more information about STM32F3 SPI features, please

refer to SPI chapter of STM32F30/31xx and STM32F37/38xx Reference Manuals (RM0316

and RM0313).

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