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'17cxx checksum computation'
1998\07\05@203756 by Frans Gunawan

Does anyone know, why checksum computation on 17cxx, is CFGW & 0x015F?
whereas on 17c7xx, CFGW & 0xC05F?
I think it is not 0x015F , but it should be 0x805F. because Bit PM2 is bit
15, not bit 8.
am I right/wrong?
I've asked Microchip, but they seem "don't care" about this. and also there
are many error in checksum computation.

My question is, why do we need checksum? many device programmer don't use
them anymore. Is it really necessary to use it?
I'm making a device programmer for this type.

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