PK2 programming failure

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AGCB

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I'm programming a pic 16f870 with a pickit2. all has been working fine till today. I now get a message "programming failed at program memory address oxoooo5c) (or 0x000033). I've checked everything and recompiled and reloaded the hex but still gives same message. I do not understand how to read hex or if it even can be read so I don't know where to go from here. Help would be greatly appreaciated
PS Chip is not very old (programmed maybe 30 times)

Aaron
 
can you erase then verify the chip is blank using the pickit2.exe program ?
 
Can you program all bits 1's and verify it as all 1's. Or at lest all bits one in that specific memory location.
 
You lost me now!! Can you tell me simply how to do that or where to read to find out?
 
AGCB!! I had a similar issue last week.. I was trying to program a pic12f675...I have done this a million times, but out of the blue it failed. I tried about 10 times, until I noticed the voltage was sitting at 4.5V instead of the normal 5.0V... I changed it back and now it works... The thing was, I never changed it, and I'm the only one who uses it.
 
Yes. I checked the voltage and everything I can think of. Shut down everything and reloaded. Searched for what 3VO said but can't find anything. I just programmed this earlier today, several times and all worked great, but now keeps coming up this 0x00033 location problem. I don't know what to do next.

Aaron
 
Have you tried the chip? Does it work? Is it really a faulty location.
I get around it by having a different programmer as a back-up and re-programming the chip.
 
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I tried a different chip and it does the same but with a different location. Sometimes 0x0000. Tried a different usb port and troubleshot pickit2. Same thing
 
Sounds to me like a problem in the pic18f2550 in the pickit2... Can you try a firmware update to eliminate a corrupt pickit2
 
No. It's a clone. When I bought it I did not know about such things. Where is the best place to buy a genuine. Microchip denied my credit card for "general" reasons. Whatever that is. Guess I did not spend enough money with them for the "bother"!
 
That's what I thought. You have to keep the 5v off the chip for a short time until the 13v Vpp is present.
 
Keep the 5v off the chip when inserting it and the allow the 5v to reach the chip at a later time. The problem is the ever-presence of 5v.
 
Ian, I'll check that And Collin I'll try that.

I ordered another clone. Only out after 3 strikes!
 
Seems to work if I open the programmer and import the hex before inserting the chip and turning on Vcc. It worked for 13 months and programmed at least a thousand times without a glitch till yesterday.

No Farnell in USA that I can find.

Aaron
 
1. You may have worn out the micro.
2. You may have damaged the micro.
3. You may have "locked-up" the micro. - it may not be re-programming.
Try shorting all the pins as the slightest remaining voltage on the chip will keep it locked-up.
 
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