Originally Posted by hugoender

I am having a problem reprogramming my PIC with my PICkit2.

I get the following error:

PK2Error0027: Failed verify (Address = 0x0 - Expected Value 0x25 - Value Read 0xBE0)

This happened to me once before and I am not quite sure how I fixed it (since all I did was click a bunch of buttons until it worked). Now that it has happened a second time, I think it is time to figure out why. I searched the forums but the other people that have this same problem just posted "nm, figured it out" but don't post what they did to fix it

If anyone can help me out with this that would be great.

Is the PIC powered by the PICkit2? If that's the case, what Vdd output do you have on the PICkit2? If it is too low (Vdd<4.5 V), that might cause the PIC not to erase properly.

erm do you mean that you program the pic once and it works and then when you try to program it again it won't recognise the pic ?

if thats the case follow these steps from the microchip forum:


Thanks to Toley for sending me a few of the problem PIC16F88 parts. This problem is unique to 18-pin parts that share the Timer1 oscillator with the PGx programming pins. Parts included are the PIC16F88, 87 and possibly the 818, 819, 62xA, & 648A.

The problem occurs when the device is programmed so that:
1) It uses the internal oscillator
-and-
2) The MCLR pin is turned off to use as a digital input instead
-and-
3) The program code enabled the Timer1 Oscillator in the T1CON register. (The sooner this is enabled after the reset vector the more likely the problem is to occur.

This problem can be prevented by avoiding one of the 3 conditions above.

It is possible to recover parts with this issue. To do so, follow these steps in the PICkit 2 Programmer software:

A) Put the part on a breadboard or other jig where it is only connected to the 5 PICkit 2 programming signals.
B) Open the PICkit 2 Programmer application v2.40 (or later). Select "Device Family > Midrange"
C) Set the PICkit 2 Programmer VDD voltage box to 3.0 Volts
D) Select "Device Family > Midrange" again; it should now detect the part
E) If the part is not detected in D), reduce the VDD by 0.1 volts and try again. Repeat until the part is detected.
F) Select the WRITE button. It should now erase the part.

You will now be able to program & use the part normally at 5.0 Volts VDD.

Originally Posted by hugoender

@Thunderchild:
I do not meet any of those 3 requirements you outlined so I don't think that is my problem. I will post here if I encounter the problem again. For now it is resolved.

well they are the basic setups recomended in the template file from microchip so if your as unfortunate as me to be trying to start up on the 16F88 you run into this often

Originally Posted by hugoender

Well it just happened to me again. It seems like once you program it successfully once, the second time you try, it gives you the error.

thats is the pricise problem that I had and found those instructions for.

erm you flashed a PDF file in to the Pickit2 as the OS ? that was clever well glad to know ya got it back they are mighty exspensive to buy (considering you are quoted 17 £ and end up paying nearly 40 after VAT at 30 % and handling and postage)

Originally Posted by hugoender

WHEW!!!! I was able to recover it using MPLAB IDE. I loaded MPLAB IDE and in there I went to Programmer > Update OS. This was the ONLY thing that was able to wake it up (stop the red busy light from blinking) and communicate with the device. Once I did this, I was able to go back into PICkit2 program and manually update the OS. Wow what a relief. I thought I had destroyed my PICkit.

If you look very carefully, on the right side of your M-sPasm IDE screen, next to where you download to the PICkit, there is a very tiny little picture of the PICkit. Sometimes, if you are having problems, clicking on this icon will straighten things out.

The error is very common, especially if you are trying to program devices that are not compatable with PICkit, such as the popular 16F84A. When you select your target device in MPasm, be sure the green or yellow dot shows next to PICkit2. If not, you will always get the error.

Also, problems with the Master reset or Vpp will cause this error.

I'm still trying to figure it all out, also. These are just a few hints I've discovered.

Don't be too concerned with harming your PICkit2. They are tough, designed to be used by we dummies. LOL!

G'luck.