i could do with a bit of advice. i have a simple circuit and code which displays a blinker on the hitachi lcd screen via a pic 16f84, but the project i have in mind requires more i/o so im trying to use the 16f876a controller, but i cant get it to work.

just wondering if anyboby has an idea of what would need to be changed.
some help would really be appriciated because im at the end of my teather

thanks for looking

 

It would help is you would post a schematic of your present circuit.


hgmjr

 

its only a small part of my project, and it's an example from a book which worked perfectly for the 16f84.

I have changed the outputs from porta (on the original) to port c becuase porta of the 16f876a has comparator hardware, although i dont think their set as default, but i changed it to be on the safe side.
As far as i can tell, becuase they're both 14-bit core it should be the same. I can post the circuit and code if you like, but because it was perfect on the 16f84, there must be something i need to change in the software, but i have no idea what it is

 

I can post the circuit and code if you like

Please do.

 

Code and schematic would be most helpful...

What are you programming with? Have you properly configured the target device? How are your configuration bits set up? What oscillator mode have you selected?