Oh, I see, now I recall the times when I played with PICs too, thanks. Been a lot of time I only used dsPICs, and I forgot. On the 16bits and 32bits (ds)PICs(24/30/33) and PIC32s the "external oscill= ator" option has a dignity in itself, i.e. no need to resort to "hacks" like on t= he PIC. PS: IVP replied (some newer 18F PICs have the proper "external oscillator" = option and wake up instantly), so as it will probably work, I will go on and buy s= ome oscillators to test the real thing on my 24F, with due optimism. Thank you = Joe! With kind regards, Mario At 19.44 2011.10.29, you wrote: >Hi there, Mario. > >I'm hampered by not having worked with that particular family, but on=20 >the PIC families that I have used thus far, the only way to get an=20 >external oscillator INTO the PIC is to configure the PIC to use a=20 >crystal or resonator, then feed the external clock source into the OSCin p= in. > >Therefore, there is always a 1024 oscillator clock cycle delay before=20 >the PIC is allowed to come out of reset. > >dwayne > > >At 06:04 AM 10/29/2011, Electron wrote: > >>Hi Dwayne, >>I'm talking about external oscillator, it doesn't have anything to do wit= h >>the Xtal. I know that using a Xtal it takes a thousands cycles to restart= : >>that's exactly what I want to avoid, using the external oscillator. I can >>test it myself but it will take some days (4-6) before I get it, I will >>order it anyway, but if anybody has ever got his PIC24 (or dsPIC or even >>PIC I think they're all the same in this regard) out of sleep while using >>an external oscillator (not a Xtal), I'd like to hear his/her experiences= .. >> >>With kind regards, >>Mario >> >> >>At 23.41 2011.10.28, you wrote: >> >At 02:19 PM 10/28/2011, Electron wrote: >> > >> >>Hi, >> >> >> >>on a PIC24FV, using external oscillator, if I make the whole chip slee= p, >> >>and I enable an CNxx INT, will the chip wake up after just one cycle? >> >> >> >>The datasheet seems to concentrate on what happens if you use a crysta= l >> >>(of course it will take ages to wake up), but what if I use an externa= l >> >>oscillator? >> >> >> >>Will it wake up "instantly"? >> > >> >I don't use that PIC, but I don't think that it wakes up >> >instantly. If you take a look at the oscillator block diagram, you >> >will probably see a 1024 cycle delay that is enforced anytime you >> >select any of the crystal oscillator options. And, as far as I know, >> >you have to select one of the crystal options if you want to feed an >> >external clock source into the PIC. >> > >> >I *could* be wrong, though. A quick look through the datasheet >> >should make things clear. >> > >> >dwayne > > >--=20 >Dwayne Reid >Trinity Electronics Systems Ltd Edmonton, AB, CANADA >(780) 489-3199 voice (780) 487-6397 fax >www.trinity-electronics.com >Custom Electronics Design and Manufacturing > >--=20 >http://www.piclist.com PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .