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Alredy seen ... halas.
Ahhh,
18F1320 ...
I had reprogramming problems with some of them ( still have one which definitly "locked" after ~ 20 reprogrammings ) Thread posted here.
The second one took service back two Picstart plus revisions later...
Batch is 05250SE ...
Tried three programmers : Picstart+, ICD2 and a ( trustable ) "custom one" ... same behaviour.
Microchip never answered anything about that ...
Soooo, I'd encourage you to turn to another pin for pin compatible chip ( 16F88 i.e. ... )
Alain
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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I don't think that's the issue. I did this test: Grabbed a brand new, never used 18F1320 and programmed and old program on it and it worked, programmed a different program and it worked, then programmed the program posted in my OP and now the chip cant be read by PicKit2. The program runs, but I cant change or erase it.
"I think fish is nice, but then I think that rain is wet, so who am I to judge?" - Douglas Adams
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I was just reading a thread on another forum ...
http://www.electro-tech-online.com/m...1320-dead.html
They came to the conclusion that erasing it with a JDM type programmer seemed to work, when the PICkit2 wouldn't..
<br>
DT
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Nice work as usual Darrel. This is exactly the problem I am having. I did google it but I guess I wasnt using the right key words.
So I guess the moral of the story is: 18F1320+TMR1(w/ext clock)+MCLRE_OFF = bad
Too bad I dont have a JMD programmer. I guess i'll see if its worth building one just to revive these 3 PIC chips.
"I think fish is nice, but then I think that rain is wet, so who am I to judge?" - Douglas Adams
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I have found that a Microchip ICD2 can program any part - properly (and can debug too). Even though it costs more, the time saved in debugging a programmer problem is worth it. And it programs EVERY PIC.
Charles Linquist
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I borrowed a JMD programmer from a friend to try to erase these PICs but no luck. After doing the erase procedure and also trying programming a working program neither worked. If I apply power to the PICs after all of that I see that they still have the program on them that stuffed them up.
Is it just me, or does it seem like bad design on behalf of microchip if disabling MCLR and setting Timer 1 to external clock will create a program that cannot be erased from the PIC?
"I think fish is nice, but then I think that rain is wet, so who am I to judge?" - Douglas Adams
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I finally solved it.
I found this very useful snippet in the PICkit2's User's Guide:
Once I set that, they erased like a dream. So three 18F1320's saved from the trashUse VPP First Program Entry - When checked, it allows the PICkit 2 to connect to and program devices with configurations and code that interferes with the ICSP signal pins, preventing PICkit 2 from detecting them.
"I think fish is nice, but then I think that rain is wet, so who am I to judge?" - Douglas Adams
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