PBP and 18F2550

[chrisshortys]

I'd try this:

DEFINE OSC 4

Robert

EDIT: This chip (like probably most PICs), has built-in oscillator. Any reason why you don't want to use that?

And double-check the configuration fuses for the oscillator.

Hi demon, I haven't had a chance to gt on the pc to try this yet but what would be the difference between using:

DEFINE OSC 4

And



Code:
@ __CONFIG _CONFIG1L, _PLLDIV_1_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L
@ __CONFIG _CONFIG1H, _FOSC_HSPLL_HS_1H



Is the define a pbp level code and the config I'm guessing in asm level?


I'm not looking at USB yet but I may well try it in future projects!

I had a look at the data sheet before posting but got very confused and gave in to google which didn't help much either

I think I may well look to moving to onboard especially if USB will drive off this too!

Thanks again!

[Demon]

I'm on cellphone, so sorry for short reply...

Datasheet says USB requires external oscillator.

[Tobias]

On the internal vs external OSC deal

I got this from Bruce Reynolds

If you have a board that will be subject to extreme heat, external will remain constant while internal may vary.

My opinion is for the cost (minimal), space required on the board (minimal) and chances of solder joint(s) being bad (minimal) I always throw an external on the board.