Can't get the pic to erase... ?!?!

[RobertD]

Hi there folks, I can't get the pic to erase. I use MPLab, with pickit2, I erased a few times, but now it doesn't erase anymore I get this message:


PK2Error0027: Failed verify (Address = 0x0 - Expected Value 0x1487 - Value Read 0x3FC0)

or This:


PK2Error0027: Failed verify (Address = 0x0 - Expected Value 0x3FFF - Value Read 0x3FE0)

I don't understand why the PIC doesn't erase.

 

[RobertD]

Ferget it, I found out why...

 

[RobertD]

How long is the delay if I put 255 in timer1 and 255 in timer2 for a delay loop? Because I can't see any on/off of the LED.

 

[RobertD]

When I erase the pic and read the registers, I read 18h in STATUS, 20h in TRISA, and 2h in TXSTA... no matter what I do, I can't get B'00000000' in TRISA, or 00010000 in PORTA. It doesn't program.

What am I doing wrong?

 

[RobertD]

Funny thing, when I load all 1's in PORTA, pins 012346 light up, but 5 and 7 don't.

 

[blueroomelectronics]

I'm assuming it's the 18F1320
Post your code and lets have a look.

 

[RobertD]

Thanks Bill, I've posted the code on the other thread. Probably because I didn't have the config and fuses set properly. I'll try with Mike's code, and see what happens.

You're assuming it's the 18F1320 acting up...? The MPLAB was reading the 88 chip, and so was the PICKIT2, at least, that's what my understanding was, of course, I'm just guessing at this point.

 

[mvs sarma]

In order to erase the 16F88, with a program configured for internal RC and IO, perhaps you need the programmer to have Vpp before Vdd. JUNEBUG has this facility, if you would have wired the MOSFETs section. Please study the issue from this angle and I am sure that you would succeed erasing the chip

 

[RobertD]

I think the problem was that I did not have any config fuses set up, neither analog or digital so I did correct the problem in the thread "can anyone tell me what's wrong with this simple program".

Thanks for your help, I'm really blue at this, so I'll make a lot of beginner mistakes...