AN3154 datasheet(27/34 Pages) STMICROELECTRONICS

Part #	AN3154

Description	CAN protocol used in the STM32 bootloader

PDF	34 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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27 / 34 page

DocID017063 Rev 5

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AN3154

Bootloader command set

Figure 21. Write Protect command: device side

1. WP = Write Protect

The STM32 sends messages as follows:

ACK message: Std ID = 0x63, DLC = 1, data[0] = ACK if the content of the command is

correct and ROP is not active else data[0] = NACK.

3.10

Write Unprotect command

The Write Unprotect command is used to disable the write protection of all the Flash

memory sectors. When the bootloader receives the Write Unprotect command, it transmits

the ACK message to the host if ROP is disabled else it transmits NACK. After the

transmission of the ACK message, the bootloader disables the write protection of all the

Flash memory sectors.

At the end of the Write Unprotect command, the bootloader transmits the ACK message and

generates a system Reset to take into account the new configuration of the option byte.

AN3154 Datasheet(PDF) 27 Page - STMicroelectronics