AN2586 datasheet(16/28 Pages) STMICROELECTRONICS

16 / 28 page

Boot configuration

AN2586

16/28

Doc ID 13675 Rev 7

3.3

Embedded boot loader mode

The Embedded boot loader mode is used to reprogram the Flash memory using one of the

available serial interfaces:

●

In low-density, low-density value line, medium-density, medium-density value line, and

high-density devices, the boot loader is activated through the USART1 interface. For

further details please refer to AN2606.

●

In XL-density devices, the boot loader is activated through the USART1 or USART2

(remapped) interface. For further details please refer to AN2606.

●

In connectivity line devices the boot loader can be activated through one of the

following interfaces: USART1, USART2 (remapped), CAN2 (remapped) or USB OTG

FS in Device mode (DFU: device firmware upgrade).

The USART peripheral operates with the internal 8 MHz oscillator (HSI). The CAN and

USB OTG FS, however, can only function if an external 8 MHz, 14.7456 MHz or 25

MHz clock (HSE) is present. For further details, please refer to AN2662.

This embedded boot loader is located in the System memory and is programmed by ST

during production.

AN2586 Datasheet(PDF) 16 Page - STMicroelectronics