Datasheet

DS10668 Rev 6 33/126
STM32L031x4/6 Functional overview
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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 X
I2S mode -
TI mode X
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