STM8S207RBT6 - write protected

[CNone.1]

Hello,

I have got an industrial PCB with a STM8S207RBT6. I'm able to READ programm memory, data memory and option bytes with ST Visual Programmer and STLink V2.

Also I can write data memory and option bytes. But if I try to write program memory I get an error:

"Programming failed. Device is write protected. Check by values."

But in by value I can't find anything about write protection. Only read out protection, which is turned off.

Option bytes are set to:

000102000000000000

Any advice for my problem?

Regards

Chris

[Peter BENSCH · Accepted solution]

The datasheet of the STM8S207RBT6, section 8 (Option bytes) gives you some explanation of the option bytes.

Yes, ROP is disabled, but the remaining bytes do not completely match the datasheet, e.g.:

• byte 2 (OPT1, UBC) contains 0x01, which stands for Pages 0 to 1 defined as UBC, memory write-protected
• byte 3 (NOPT1, NUBC) contains 0x02, but should be the complement of byte 2, i.e. 0xFE
• byte 4 (OPT2, AFR) contains 0x00, which might be OK
• byte 5 (NOPT2) also contains 0x00, but should be the complement of byte 4, i.e. 0xFF
• etc

This section of the datasheet also describes how to perform a write to the memory.

Good luck!

When your question is answered, please close this topic by choosing Select as Best. This will help other users find that answer faster.

/Peter

[CNone.1]

Thanks, you solved my problem!