STM32L031X4 datasheet(33/126 Pages) STMICROELECTRONICS

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DS10668 Rev 6

33/126

STM32L031x4/6

Functional overview

having an extremely low energy consumption. Higher speed clock can be used to reach

higher baudrates.

LPUART interface can be served by the DMA controller.

3.16.4

Serial peripheral interface (SPI)

The SPI is able to communicate at up to 16 Mbits/s in slave and master modes in full-duplex

and half-duplex communication modes. The 3-bit prescaler gives 8 master mode

frequencies and the frame is configurable to 8 bits or 16 bits. The hardware CRC

generation/verification supports basic SD Card/MMC modes.

The USARTs with synchronous capability can also be used as SPI master.

The SPI can be served by the DMA controller.

Refer to Table 13 for the supported modes and features of SPI interface.

3.17

Cyclic redundancy check (CRC) calculation unit

The CRC (cyclic redundancy check) calculation unit is used to get a CRC code using a

configurable generator polynomial value and size.

Among other applications, CRC-based techniques are used to verify data transmission or

storage integrity. In the scope of the EN/IEC 60335-1 standard, they offer a means of

verifying the Flash memory integrity. The CRC calculation unit helps compute a signature of

the software during runtime, to be compared with a reference signature generated at

linktime and stored at a given memory location.

3.18

Serial wire debug port (SW-DP)

An Arm SW-DP interface is provided to allow a serial wire debugging tool to be connected to

the MCU.

Table 13. SPI implementation

SPI features(1)

1. X = supported.

SPI1

Hardware CRC calculation

I2S mode

TI mode

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