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