pic16f767 running very slow.

[Nick]

Here is the setup. I wrote some code for a PIC16f876 now I'm trying to run it on a PIC16f767 (nanowatt). When I run the that code a 767, it runs super slow. I can see that its running the code by the LEDs turning on/off, but its just super slow. I can run the same code on the 876 and it works fine. The only thing I have changed in the code is the header file. I am also using the same test board for each of the chips.

Anyone have any ideas?

Nick

[valemike]

Since no one has answered this yet, I guess not many people use the 16F767 and thus can't share any experiences with you.

I took a glance at description of the 16F767 and noticed that it does have internal oscillators.

Can it be that you are really running off your internal oscillator? You can find out by pulling out your crystal, and see if the code still runs. Or you can simply change the delay (clock=4000000) directive and see if your code then runs faster.

However, what i'm saying doesn't really make sense since you say that you are using the same code, and I assume that you didn't change your #fuses statement where you select between HS, XT, INTRC, INTOSC, etc.

If you are using Microchip's MPLAB, then take a look at the pulldown menu to see what configuration bits are really being set.

I'd look at these things first before I read the manual. Good luck.