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Suggestions for migrating from 18F8390 to 18F83J90

 
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PicFan



Joined: 01 Jan 2004
Posts: 11
Location: Indianapolis (Go Colts!)

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Suggestions for migrating from 18F8390 to 18F83J90
PostPosted: Tue Sep 21, 2010 8:54 am     Reply with quote
I've been handed a project to update that originally had an 18F8390 (supported by 3.249) but is now being constructed with an 18F83J90.

I haven't needed to update my compiler for some time now and I am currently using PCWH 3.249. However this version does not include a header file for the 18F83J90.

I've checked the two data sheets and noticed that many of the SEGxx pins have changed but not much else is obvious (we were already running 3.3v).

Is it reasonable to think I could adapt (header file changes) my PCWH 3.249 to accommodate the "J" version micro? I'm always a little hesitant to upgrade compiler versions that may break my older version code.

Thanks in advance,
PicFan
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Tue Sep 21, 2010 12:17 pm     Reply with quote
Download the 18F83J90 data sheet.
http://www.microchip.com/stellent/groups/picmicro_sg/documents/devicedoc/en027561.pdf
Look in this section, in the back of the PDF:
Quote:

APPENDIX B: MIGRATION BETWEEN HIGH-END DEVICE FAMILIES

It has 3 pages of differences between the "J" and the "non-J" devices.
You need to go through those in detail.
PicFan



Joined: 01 Jan 2004
Posts: 11
Location: Indianapolis (Go Colts!)

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PostPosted: Tue Sep 21, 2010 12:34 pm     Reply with quote
Superb advice, I don't know how I missed seeing that but it is exactly what I needed.

Thanks PCM !!!
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