>> It's the safest way on PICs without a LAT register, such as the 16s
>>
> That should read "such as the old 16s".

Yes, quite right

I did mean to finish the sentence about shadow registers. shadowa
for PortA, shadowb for PortB etc

One application I use a shadow regularly is LCDs in 4-bit mode,
eg when you want to preserve the lower nybble of a port and use
the upper nybble for LCD data, ANDing / swapping the source
nybbles into the port reading

Joe


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