Normally, I?d prefer to just let the company responsible handle these sorts=
 of questions, but Microchip?s support responses seem to be pretty lacking,=
 to put it politely, and I?m trying to decide on a chip soon enough that I =
can potentially use a few extra in some holiday gifts. Any suggestions for =
an affordable gift-worthy project would be appreciated. :)


Digikey seems to think PIC18LFK22-E/P and PIC18LFK22-I/P have different max=
imum processing speeds, and not just different temperature ranges. Is their=
 database entry simply wrong, or is there something I?m not finding on Micr=
ochip?s data sheet?


In 80437F.pdf, the errata for the PIC18LFK22, Item 4.5 mentions that, while=
 using I2C, the RCEN bit not being cleared when an ?Improper Stop? is recei=
ved. I can find nothing anywhere about what this is, or in what circumstanc=
es it would ever happen; there?s certainly nothing in the I2C specification=
 about what an ?Improper Stop? is. I?m particularly concerned because I int=
end to use I2C in Multi-Master mode, and by all appearances, very few PICs =
get Multi-Master done correctly in hardware, where it is supposed to be don=
e.


In 41214A.pdf, ?CCP and ECCP Tips ?n Tricks? (a good beginner?s guide to th=
e ECCP), TIP #6 mentions using the comparator together with the ECCP. What =
isn?t exactly clear is whether the connection from the comparator to the EC=
CP is supposed to be internal or external to the PIC. I can see a valid imp=
lementation both ways, though in this case I would guess that it?s external=
..


Can one ECCP unit simultaneously receive one PWM input and generate a separ=
ate, unrelated PWM output? I want to read a bar code, and I?m curious wheth=
er I can generate a pulse pattern to distinguish legitimate reflectance fro=
m background noise with just one ECCP.




Ryan Pettigrew
--=20
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