PIC16f877A first 8 bytes destroyed after closing PicKit2 programmer app....

[LakisFM1]

Hello to the forum,

Using PicKit2 i write/verify a hex file on 16F877A , all ok.

I even load another file and back read the 877A and all still ok.

BUT then i close the pickit application,
when i re-open Pickit application and read the 877A the first 8 bytes are FF , the rest bytes are proper.

My program has nothing to do with on-the-fly code-programming to overwrite the first 8 program memory bytes ...

The program is (now only a simple port-toggle , problem is still happening ...)


OPTION_REG.7 = 0 ; ENABLE PORTB PULLUPS

LOOP:
portb.0 = not portb.0
GOTO LOOP