It is pin-compatible. I just download the latest datasheet for
the 18F USB parts. I also checked the previous version, nothing
changes for the pin-out. RC4/RC5 are used for USB D-/D+. 
RC6/RC7 are used for USART (TX/RX). This is the same as 16C745.

Xiaofan

-----Original Message-----
From: Mike Hord [mailto:mike.hord@gmail.com]
Sent: Tuesday, May 10, 2005 9:08 PM
To: Microcontroller discussion list - Public.
Subject: Re: [PIC] Using pickit 1 to program other picmicros


> > Why not changed it to the new 18F USB parts (also need
> > to change the oscillator to 4Mhz or multiply of 4MHz)?


I think the fatal flaw there may be pinout.  I'm not certain that the
newer USB parts are pin compatible-  IIRC, the C7x5 PICs use the
RC6/RC7 pins as USB, while at least the 18F that I saw the pinout for
most recently reserves those for a USART and uses RC4/RC5 (again,
from memory) for USB.  It's still worth a look- but at that point, you
almost may as well be writing your own programmer.

Mike H.


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