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A PIC16 (e.g. this one) have a bunch of registers, which are 8 bit wide, and two "Configuration words" (see pages 43, 44) which are 14 bit wide.

Why do the configuration words make exception for the PIC16?

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The configuration words are the same width as the program flash memory.

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    \$\begingroup\$ For completeness: ...and these configuration words are mapped in program/instruction memory. They are mapped at an address location which is not accessible during normal device operation (it can be accessed only during programming mode) \$\endgroup\$
    – m.Alin
    Nov 1 '12 at 18:48

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