I’ve encountered a technical issue and require technical support to find a solution or an answer.

[zhanxi]

 Hello
During usage testing, this chip encountered the following issues.
Please take a look and provide a solution.

Below is the problem

1、0x400~0x407: 8-byte backdoor decryption key for the memory, used to temporarily decrypt the MCU when enabling backdoor decryption

2、0x408~0x40B: P-Flash protection (Protection) configuration bytes, whose values are automatically loaded by the hardware into the P-Flash protection register (FPTOTO~3) as their initial values during the MCU reset process; 0x40C: Flash encryption (Security) configuration byte, whose value is automatically loaded by the hardware into theP-Flash encryption register (FSEC) as its initial value during the MCU reset process 

3、0x40D: Configuration byte for the non-volatile flash option, whose value is automatically loaded into the Flash Non-Volatile Option Register (FOPT) by the hardware during the MCU reset process as its initial value

4、0x40E: EEPROM protection configuration byte; its value is automatically loaded by the hardware into the EEPROM protection register (FEPROT) as its initial value during the MCU reset process

5、0x40F: D-Flash protection configuration byte; its value is automatically loaded by the hardware into the D-Flash during the MCU reset process

6、The Flash Protection Register (FDPROT) is set to its initial value

[pavla_hajna]

Hello,

in order to assign your inquiry accordingly could you please specify the part number you refer to? Thank you. Have a nice day.

Best regards

Pavla