STM32L100RC datasheet(28/104 Pages) STMICROELECTRONICS

28 / 104 page

Functional overview

STM32L100RC

28/104

DocID024995 Rev 4

3.15.3

Serial peripheral interface (SPI)

Up to three SPIs are 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 SPIs can be served by the DMA controller.

3.15.4

Universal serial bus (USB)

The STM32L100RC device embeds a USB device peripheral compatible with the USB full-

speed 12 Mbit/s. The USB interface implements a full-speed (12 Mbit/s) function interface. It

has software-configurable endpoint setting and supports suspend/resume. The dedicated

48 MHz clock is generated from the internal main PLL (the clock source must use a HSE

crystal oscillator).

3.16

CRC (cyclic redundancy check) calculation unit

The CRC (cyclic redundancy check) calculation unit is used to get a CRC code from a 32-bit

data word and a fixed generator polynomial.

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 link-

time and stored at a given memory location.

STM32L100RC датащи(PDF) 28 Page - STMicroelectronics