Readout Protect Command; Figure 47. Write Unprotect Command: Device Side - ST STM32F105 Series Application Note

System memory boot mode

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CAN bootloader

1. WPUN = Write Unprotect.

The STM32F105xx and STM32F107xx sends the messages as follows:

ACK message: Std ID = 0x73, DLC = 1, data[0] = ACK if the content of the command is

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

3.14

Readout Protect command

The Readout Protect command is used to enable the Flash memory read protection. When

the bootloader receives the Readout Protect 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 enables the read protection for the Flash memory.

At the end of the Readout Protect 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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