On Jul 8, 2009, at 2:02 AM, Rikard Bosnjakovic wrote:

>> modifying a single bit in byte-wide register without the
>> programmer having to explicitly read the byte, modify the desired  
>> bit,
>> and write the byte back.
>
> Isn't that (reading a whole byte) exactly what a PIC does?

Yep.  Thus the phrases "the programmer" and "explicitly."

BillW

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