STM32L073CZI3DTR datasheet(39/157 Pages) STMICROELECTRONICS

Part #	STM32L073CZI3DTR

Description	Ultra-low-power 32-bit MCU Arm®-based Cortex®-M0, up to 192KB Flash, 20KB SRAM, 6KB EEPROM, LCD, USB, ADC, DACs

PDF	157 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

39 / 157 page

DS10685 Rev 6

39/157

STM32L073xx

Functional overview

3.19

Clock recovery system (CRS)

The STM32L073xx embed a special block which allows automatic trimming of the internal

48 MHz oscillator to guarantee its optimal accuracy over the whole device operational

range. This automatic trimming is based on the external synchronization signal, which could

be either derived from USB SOF signalization, from LSE oscillator, from an external signal

on CRS_SYNC pin or generated by user software. For faster lock-in during startup it is also

possible to combine automatic trimming with manual trimming action.

3.20

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.

3.21

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.

STM32L073CZI3DTR Datasheet(PDF) 39 Page - STMicroelectronics