Squeezing out a bit more performance from the P1

brianh

Hi all.

My P1 project uses a 6.25M crystal and I run the P1 at 100MHz. It's very reliable at that speed. Can I get the little bit more my application needs?

The critical sections don't quite fit. I literally need a couple more instruction cycles after optimizing as much as possible (I think!). What's a reasonable crystal freq and overclock, >100MHz I could try?

(Please don't suggest P2 it's not possible for this project.)

VonSzarvas

The parts are tested at 104MHz at room temperature, so you could try that.

If you need more, 110MHz is the level above which most 2-layer board layouts will fail. (ie., those designed only for 80MHz).

In theory you could run with an 8MHz crystal and PLL16x for 128MHz, but you'd need a really quality multi-layer design with exceptional power supplies / decoupling / layout. If you have that, test with 8MHz first! If you have an issue with temperature in your application/enclosure, just add cooling to keep the max temp rise of the P1 IC within whatever the datasheet specs as maximum.

Vote of confidence for you... It can surely be done!

Wuerfel_21

@brianh said:
The critical sections don't quite fit. I literally need a couple more instruction cycles after optimizing as much as possible (I think!).

You think. Post code. Decimating bad code on sight is my "shitty superpower".