Reboot necessary after OTP write?

[timothy0508]

I am using the STM32L432KCU for a project. I intend to use the OTP area for writing persistent device information (serial number, encryption keys, etc).

1. Is a reboot necessary after writing to the OTP area?
2. Can the OTP region be written to 32 bits at a time, or does it have be 64 bits?

Thanks

Tim

[TDK]

No reboot is necessary.

You can only write 64 bits at a time per the reference manual (technically 72 with ECC included).