PIC Programming Issues

[Ondra]

Good day all. I have a system that I built using a Pic 18F258. I want to upgrade to the 18F2680. The system as it is
has a 20 MHZ crystal and 20pf capacitors. I am using the PIC start plus programmer version made by OLIMEX and the
MPLABs IDE for programming. The problem is that when I program the 18f2680 chip for about the second or third time
the chip seems to get damaged. In that every time after that I try to program the chip all I get is a list of errors:
"Program Memory Errors

Address Good Bad

0000: EF6E EF2C
0002: F036 F030
0008: EF72 EF30
000A: F036 F030

Additional errors are not displayed." I tried erasing the the device first with no success. Does anyone have any Idea's as to
what may be happening. I can and do Program the 18f258 chip many time without issues what am I missing here?
Does anyone know what when I come to programming what's the difference between the 18F258 and the 18F2680?

Ondra

[Steve]

Hi Ondra,

I'll ask someone here to look into this today.

[Sean]

There is a difference between the maximum programming voltage (Vpp) specified for the two devices.

The 18F258 specifies 13.25V, whereas the 18F2680 specifies 12.5V. Does your programmer meet these requirements, or could the 18F2680 be being over stressed during programming?

[Ondra]

Thanks Guys I'll have a look into it.The programmer is made by Olimex. They are closed until Friday. The data sheet doesn't give much details on the device Just that is it emulates PIC Start Plus.

Ondra