PIC18f4220

[paul borgmeier]

jcullins,

I do not use the EPIC so I cannot say - however, from MELabs website

http://www.melabs.com/support/epicfixs.htm


snip ....

#1 Most Encountered Problem - Power Supply

The most common cause of programming problems is low power supply voltage. We highly recommend the use of an AC Adapter. Batteries become depleted very quickly, causing program errors ("Code Programming Error at 0000").

... end snip

Good Luck,

Paul Borgmeier
Salt Lake City, Utah
USA

[jcullins]

The programmer works fine with the PBP compilier. I program the 16f series all the time with no problem. But it shifts over to the Mchips assembler.
I assembles with no errors but just want program.
Thanks for you help guys.
Jim

[TomM]

Have you seen this?

http://www.melabs.com/support/cap_mod.htm

I've also had some intermittent problems with the serial programmer and 18Fxxxx parts. I just ran across this note the other day and haven't had a chance to try it yet. A shorter cable to the socket also seems to help.

[Ron Marcus]

I've found that too much capacitance on the B+ line will cause errors with the serial programmer. Powering up the circuit may help. Likewise, if there are any loads on the programming pins of more than a mil, the programmer will read an error. If you have a pinned version, try programming by itself first as a loose part. If that works, then it is a circuit level issue.
A large, powerful magnet wrapped in a layer of tin foil held about an inch above the chip while programming, may help, but be sure there are no cats in the room(or wet them down) due to static EMD problems. The last solution will work only on today's date.

Hope some of this helps,
Ron

[jcullins]

Thanks Guy,
I will try the .1 however I am programing DIP parts by incerting them in the programer and not using the ISP plug.
I am also using the wall wart. It programs the 16 series very well.
I will let you know if it works
Jim

[jcullins]

Thanks a bunch guys
The cap and the software patch fixed eveything.
Thanks for you help
Jim