hello all,
i'm posting for some help on missing clock on 16F877A
First of all, i have some questions about the ICSP programming:
I've used ICSP programming algorithm 1, with 13V on MCLR.
Microchip says that this serial programming allow to program the microcontroller in the user circuit application. I've discovered that if there is a crystal resonator connected to osc1/osc2 the configuration bits programming fail, when i read the bits back i get 0x0000. Disconnectiong the crystal seems they are programmed fine, i read them back correctly. So do i have to disconnect the cristal everytime i program the pic ? If so, what is the standard way to go if i have to reprogram many times ?