STM32F051R6 datasheet(12/104 Pages) STMICROELECTRONICS

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Functional overview

STM32F051x

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Doc ID 022265 Rev 3

Functional overview

3.1

ARM® CortexTM-M0 core with embedded Flash and SRAM

The ARM Cortex™-M0 processor is the latest generation of ARM processors for embedded

systems. It has been developed to provide a low-cost platform that meets the needs of MCU

implementation, with a reduced pin count and low-power consumption, while delivering

outstanding computational performance and an advanced system response to interrupts.

The ARM Cortex™-M0 32-bit RISC processor features exceptional code-efficiency,

delivering the high-performance expected from an ARM core in the memory size usually

associated with 8- and 16-bit devices.

The STM32F051x family has an embedded ARM core and is therefore compatible with all

ARM tools and software.

Figure 1 shows the general block diagram of the device family.

3.2

Memories

The device has the following features:

●

Up to 8 Kbytes of embedded SRAM accessed (read/write) at CPU clock speed with 0

wait states and featuring embedded parity checking with exception generation for fail-

critical applications.

●

The non-volatile memory is divided into two arrays:

–

16 to 64 Kbytes of embedded Flash memory for programs and data

–Option bytes

The option bytes are used to write-protect the memory (with 4 KB granularity) and/or

readout-protect the whole memory with the following options:

–

Level 0: no readout protection

–

Level 1: memory readout protection, the Flash memory cannot be read from or

written to if either debug features are connected or boot in RAM is selected

–

Level 2: chip readout protection, debug features (Cortex-M0 serial wire) and boot

in RAM selection disabled

3.3

Boot modes

At startup, the boot pin and boot selector option bit are used to select one of three boot

options:

●

Boot from User Flash

●

Boot from System Memory

●

Boot from embedded SRAM

The boot loader is located in System Memory. It is used to reprogram the Flash memory by

using USART1.

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