When the MCU is running, the contents stored in the EEPROM are all changed to FF. What is the reason?

深圳小花

When the MCU is running, the contents stored in the EEPROM are all changed to FF. What is the reason? [Copy link]

When the MCU is running, the contents stored in the EEPROM are all changed to FF. What is the reason?

chunyang

Usually it is a programming problem, where the relevant code is executed incorrectly. In extremely rare cases, it is a chip design problem, but there will be a large number of user reports of this problem. If there are no widespread reports, it is unlikely to be a chip problem.

深圳小花

chunyang posted on 2021-8-1 00:07 Usually it is a programming problem, and the relevant code is executed incorrectly. In extremely rare cases, it is a chip design problem, but this problem will be reported by a large number of users, and it will be reported on the Internet...

Thank you very much. This EEPROM is an external chip, not built-in MCU. Will this situation also happen?

chunyang

Shenzhen Xiaohua published on 2021-8-1 08:48 Thank you very much. This EEPROM is an external chip, not built-in MCU. Will this situation also happen?

External ones can only be caused by programming problems.

freebsder

Check the usage and operating environment. Sometimes voltage problems can cause eeprom protection.

深圳小花

freebsder posted on 2021-8-2 16:38 Check the usage and operating environment. Sometimes voltage problems will cause eeprom protection.

Thank you very much. Will EEPROM protection cause the data to be rewritten to FF?

freebsder

Shenzhen Xiaohua published on 2021-8-3 09:35 Thank you very much. EEPROM protection, will it cause the data to be rewritten to FF?

It depends on the device. Some devices will erase data when they enter protection under certain conditions, which is called security.

深圳小花

freebsder posted on 2021-8-3 16:53 It depends on the device. Some devices will erase data when entering protection under certain conditions, so-called security.

Thank you very much. Is there any relevant information? Can you provide a link?

freebsder

Shenzhen Xiaohua published on 2021-8-3 19:51 Thank you very much. Is there any relevant information? Can you provide a link?

You should look up the problematic device in your hand to see what conditions caused the abnormality.