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The '8722 is pin compatible and software compatible with the '8720 and it's only got a couple of different registers to worry about. I would think it would be an easy replacement. And removing an TQFP isn't all that hard, if you do it one pin at a time (at least that's what they teach in the class I just got back from).Originally Posted by nverma
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Well I guess if I can't get it working soon, I'll most probably do that. Thanks, please let me know if anyone else knows what im doing wrong.
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For grins, try changing your variable names and accessing registers like the MEMCON, PSPCON, etc. with the peek/poke to their actual locations vs. using their actual names...
Ya never know...
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We could still compile a HEX file with PBP 2.47 to see what happen?
Unfortunately i don't have those on hand... out of stock and there's no plan around them soon. Even if it was the case....
http://www.microchip.com/stellent/id...ct1=PIC18F8720
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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Back a few years ago, when I saw the errata sheet for the 4Mhz limitation, I put that MCU in 'Not Recommended for ANY design' bin.
I've got a couple of '8722's that haven't failed me yet (well, at least any more than anything else).
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I found the problem! So surprising enough, PORTD needs to be driven at more current, I replaced the 10K resistor arrays with 1.5K resistor and now it seems to be working fine. But really these CMOS inputs should not need this much current. Just thought you guys would be curious. Thanks!
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That's a bit of a worry. With 877's on PORTD, I typically use 100KΩ + resistors with no problems at all. Theoretically, with CMOS - up to 1MΩ should actually work.
Last edited by T.Jackson; - 15th May 2007 at 18:56.
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....which is why mr_e suggested posting a schematic or something like it back in post #4....
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