[176] System: Flash erase through CTRL-AP fails due to watchdog time-out

This anomaly applies to IC Rev. Rev 1, build codes QFAA-B00, QFAB-B00, CIAA-B00.

It was inherited from the previous IC revision Engineering C.

Symptoms

Full flash erase through CTRL-AP is not successful.

Conditions

WDT is enabled.

Consequences

Flash is not erased. If the device has a WDT time-out less than 1 ms and is readback-protected through UICR.APPROTECT, there is a risk of permanently preventing the erasing of the flash.

Workaround

Try again.