Write Unprotect Command; Figure 45. Write Protect Command Via Can: Device Side - ST STM32F105 Series Application Note

System memory boot mode

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CAN bootloader

1. WP = Write Protect

The STM32F105xx and STM32F107xx sends the messages as follows:

ACK message: Std ID = 0x43, DLC = 1, data[0] = ACK if the content of the command is

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

3.13

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.

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Doc ID 14156 Rev 1

AN2662

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