Overclock RTC?

[jimbostlawrence]

Hi Henrik,

Thanks for having a think. I have already used code to jump the clock to critical time points (just before a sleep routine/wake-up routine), but it's never a true substitute for actually "running the clock/system the way it has to be run in the code". I have had a suggestion to try a remote control 455 kHz resonator; will see what I can come up with. Maybe sacrifice a slightly duff board for the cause to test the sleep routines. Didn't want to have to solder/savage a board but if that is what needs to be done I'll give it a shot.

Kind regards

Jimbo

[Amoque]

I should think that the hardware, "messy", means would be preferred (I mean except for the effort and expense). In this way you can run and develop software that will be, line for line, transferable to the accurately timed board - any artifacts between software versions are eliminated. Indeed, I can think of no better way to verify the operation of the "final" version of software than running it unmodified on high-speed hardware.


Just a thought...

Amoque

Merry Christmas, all!

[HenrikOlsson]

Hi,
I agree, doing it in hardware would be preffered it's just that (if I'm not mistaken of course) the hardware doesn't support doing that.
The TMR1 oscillator is designed to operate at 32.768kHz, overcklocking it to some faster frequency is operating it outside its specification. If a problem pops up is it due to the code or to the oscillator being run outside its spec?

On the other hand, if it does work then at least you should have no problems running it at the correct frequency. Only one way to find out, try it and tell us how it went!

/Henrik.

[Darrel Taylor]

The Timer1 oscillator may only work with 32.768kHz, but T1CKI can take up to 12Mhz (according to post #2)

Remove the crystal, and use another PIC to inject whatever frequency you want.

[jimbostlawrence]

Many thanks all. I'll give it a shot when I return to work and see how I get on with this.

Will let you know my findings. I know how important it is to post any resolutions on forums...

Kind regards and merry Christmas to all!

-Jimbo-