Hi,

I need to implement a lookup table for about 1500 8-bit values.  This is
on a 16F628.  The table read will be made from an interrupt routine.

The index for the lookup would obviously need to be supplied in two
registers.  Does anyone have some working, and preferably commented,
code that they are able to share?

I did search back through the archives, but while there were some
discussions that might (together with AN556) help me to eventually code
my own routine, it seems there are several traps to watch out for.

I noticed also that many people save and restore PCLATH in interrupt
service routines, something I have not done before.  Presumably this is
something I will have to do now?

What rule of thumb should one apply to determine if saving PCLATH in an
ISR is required?

Cheers,
-bernie.

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