Readout Protect Command; Figure 21. Readout Protect Command: Host Side - ST STM32F105 Series Application Note

AN2662
2.15

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 byte to the
host. After the transmission of the ACK byte, the bootloader enables the read protection for
the Flash memory.
At the end of the Readout Protect command, the bootloader transmits the ACK byte and
generates a system Reset to take into account the new configuration of the option byte.

Figure 21. Readout Protect command: host side

1. RDP_PRM = Readout Protect.
(1)
Start RDP_PRM
Send 0x82+0x7D
Wait for ACK
or NACK
ACK
Wait for ACK
or NACK
ACK
(1)
End of RDP_PRM
Doc ID 14156 Rev 1
USART bootloader
NACK
NACK
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