> Hmm.. I thought both flash and OTP use 0x3fff unprogrammed
> (that's for 14-bit). I don't have any C parts here to check though

Me neither. I just recall (I think correctly) that from a discussion
ages ago OTP are supplied full of 00. No idea whether that's an
inherent part of the process of making an OTP (as I mentioned
before, 68HC OTPs are, or at least used to be, 00 too) or
whether MChip chose by design to have the C versions full of
00 (NOP) that can be written over

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