Quote Originally Posted by Bruce
Some 18F parts have "power managed modes" that work with EC oscillators, so the data sheet indicates current consumption in EC mode as well as other oscillator options.

In the 18F2420 data sheet, look in the power managed modes section for details.

Note that this does not indicate whatever current your external TTL clock osc is going to eat up. Only what's needed/used by the PIC.

The 819 doesn't have anywhere near the bells & whistles the 18F series does, and all the 819 data sheet can really tell you about power consumption is what the PIC itself requires.

TTL clock type oscillators have their own current specs. You would need to factor that in with what's shown in the 819 data sheet as Melanie indicated.
The oscillator output is one of the of the CC1100 programmable functions. It draws 90 uA at 3 volts with the clock running while in "wake on radio mode". Of course, if it is feeding the PIC also, this value will increase. I have it breadboarded right now with a GPS module and on screen display, so current measurement is a bit tricky. I am running separate oscillators while I check out the GPS functionality. The next test will be to make sure the oscillator output from the 1100 will reliably run the PIC.

Thanks again for the input...
Ron