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Discussion Groups | Piclist | PIC Timing
A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.
PIC Timing - Author Unknown - Jan 31 15:54:00 2004
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I need to use an External Oscilator for my 16F628. Which setting should I use? LP, XT, HS, EC? What else do I need to do? Thanks for any help. |
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Re: PIC Timing - John Remington - Jan 31 17:49:00 2004
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XT --- wrote: > I need to use an External Oscilator for my 16F628. Which setting > should I use? LP, XT, HS, EC? > > What else do I need to do? > > Thanks for any help. __________________________________ |
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Re: PIC Timing - Scott Kellish - Jan 31 18:14:00 2004
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It depends on what freq Osc your using. From page 93,
table 14-2 of the PIC16F62X datasheet (which I assume you forgot to mention that you
read but were confused :) ),
Mode
Freq
LP
32kHz or 200kHz
XT
100kHz, 2MHz or 4MHz
HS
8MHz, 10MHz or 20MHz
You need to refer to the data sheet because you must
include capacitors on each leg of the XTAL. The tables give the appropriate values. There
is also a similar table if your using a ceramic resonator circuit.
Scott Kellish
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Re: PIC Timing - Author Unknown - Jan 31 18:19:00 2004
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When I put it on XT, it doesn't work at all. Right now, i have it on INT.... ideas? --- In , John Remington <jrem123@y...> wrote: > XT > > --- honamos@y... wrote: > > I need to use an External Oscilator for my 16F628. Which setting > > should I use? LP, XT, HS, EC? > > > > What else do I need to do? > > > > Thanks for any help. > > > > __________________________________ |
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Re: PIC Timing - Scott Lee - Jan 31 18:20:00 2004
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Nope. Use EC and you will gain the use of RA6! --- In , John Remington <jrem123@y...> wrote: > XT > > --- honamos@y... wrote: > > I need to use an External Oscilator for my 16F628. Which setting > > should I use? LP, XT, HS, EC? > > > > What else do I need to do? > > > > Thanks for any help. > > > > __________________________________ |
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Re: PIC Timing - Phil - Jan 31 19:44:00 2004
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doesn't this all depend on what he means by external oscillator? If he means crystal or resonator, then this answer is correct but if he wants to generate the clock elsewhere and pump it into the pic, then EC is the way to go. --- In , "Scott Kellish" <skellish@c...> wrote: > It depends on what freq Osc your using. From page 93, table 14-2 of the PIC16F62X datasheet (which I assume you forgot to mention that you read but were confused :) ), > > Mode Freq > LP 32kHz or 200kHz > XT 100kHz, 2MHz or 4MHz > HS 8MHz, 10MHz or 20MHz > > You need to refer to the data sheet because you must include capacitors on each leg of the XTAL. The tables give the appropriate values. There is also a similar table if your using a ceramic resonator circuit. > > Scott Kellish > > ----- Original Message ----- > From: John Remington > To: > Sent: Saturday, January 31, 2004 5:49 PM > Subject: Re: [piclist] PIC Timing > XT > > --- honamos@y... wrote: > > I need to use an External Oscilator for my 16F628. Which setting > > should I use? LP, XT, HS, EC? > > > > What else do I need to do? > > > > Thanks for any help. > > > > __________________________________ > to unsubscribe, go to http://www.yahoogroups.com and follow the instructions > Yahoo! Groups Sponsor > ADVERTISEMENT > -------------------------------------------------------------------- ---------- > Yahoo! Groups Links > > a.. To |
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Re: Re: PIC Timing - Scott Kellish - Jan 31 21:44:00 2004
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Your right in that it depends on what he wants to use as
a clock. He said "external osc", but if he's going to use a clock derived elsewhere than
EC would be used. He really needs to read the datasheet as all (most) of the answers are
right there.
Scott
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Re: PIC Timing - Author Unknown - Jan 31 21:57:00 2004
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Well, I have a 4MHz Oscillator. I tried XT, but it doesn't work. It only works on INTRC(IN) for some reason. I have the appropriate capacitor values for XT, but it still doesn't work. Ideas? Shamoon --- In , "Scott Kellish" <skellish@c...> wrote: > It depends on what freq Osc your using. From page 93, table 14-2 of the PIC16F62X datasheet (which I assume you forgot to mention that you read but were confused :) ), > > Mode Freq > LP 32kHz or 200kHz > XT 100kHz, 2MHz or 4MHz > HS 8MHz, 10MHz or 20MHz > > You need to refer to the data sheet because you must include capacitors on each leg of the XTAL. The tables give the appropriate values. There is also a similar table if your using a ceramic resonator circuit. > > Scott Kellish > > ----- Original Message ----- > From: John Remington > To: > Sent: Saturday, January 31, 2004 5:49 PM > Subject: Re: [piclist] PIC Timing > XT > > --- honamos@y... wrote: > > I need to use an External Oscilator for my 16F628. Which setting > > should I use? LP, XT, HS, EC? > > > > What else do I need to do? > > > > Thanks for any help. > > > > __________________________________ > to unsubscribe, go to http://www.yahoogroups.com and follow the instructions > Yahoo! Groups Sponsor > ADVERTISEMENT > -------------------------------------------------------------------- ---------- > Yahoo! Groups Links > > a.. To |
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Re: Re: PIC Timing - Chad Russel - Jan 31 22:28:00 2004
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If you have an oscillator and not a crystal, the you don't need any capacitors. Just hook it up to the OSCIN or OSC1 pin and set the PIC to HS, XT or LP. --- wrote: > Well, > I have a 4MHz Oscillator. I tried XT, but it doesn't work. It only > works on INTRC(IN) for some reason. I have the appropriate capacitor > > values for XT, but it still doesn't work. > > Ideas? > > Shamoon > --- In , "Scott Kellish" <skellish@c...> > wrote: > > It depends on what freq Osc your using. From page 93, table 14-2 of > > the PIC16F62X datasheet (which I assume you forgot to mention that > you read but were confused :) ), > > > > Mode Freq > > LP 32kHz or 200kHz > > XT 100kHz, 2MHz or 4MHz > > HS 8MHz, 10MHz or 20MHz > > > > You need to refer to the data sheet because you must include > capacitors on each leg of the XTAL. The tables give the appropriate > values. There is also a similar table if your using a ceramic > resonator circuit. > > > > Scott Kellish > > > > ----- Original Message ----- > > From: John Remington > > To: > > Sent: Saturday, January 31, 2004 5:49 PM > > Subject: Re: [piclist] PIC Timing > > > > > > XT > > > > --- honamos@y... wrote: > > > I need to use an External Oscilator for my 16F628. Which > setting > > > should I use? LP, XT, HS, EC? > > > > > > What else do I need to do? > > > > > > Thanks for any help. > > > > > > > > > > > > __________________________________ > > > > > > to unsubscribe, go to http://www.yahoogroups.com and follow the > instructions > > > > > > Yahoo! Groups Sponsor > > ADVERTISEMENT > > > > > > > > > > > > > -------------------------------------------------------------------- > ---------- > > Yahoo! Groups Links > > > > a.. To ===== My software has no bugs. Only undocumented features. __________________________________ |
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Re: PIC Timing - Author Unknown - Feb 1 0:07:00 2004
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Hey Chad, I'm using a crystal. A 4MHz crystal... What now? Thanks for your help. Shamoon --- In , Chad Russel <chadrussel@y...> wrote: > If you have an oscillator and not a crystal, the you don't need any > capacitors. Just hook it up to the OSCIN or OSC1 pin and set the PIC > to HS, XT or LP. > > --- honamos@y... wrote: > > Well, > > I have a 4MHz Oscillator. I tried XT, but it doesn't work. It only > > works on INTRC(IN) for some reason. I have the appropriate capacitor > > > > values for XT, but it still doesn't work. > > > > Ideas? > > > > Shamoon > > --- In , "Scott Kellish" <skellish@c...> > > wrote: > > > It depends on what freq Osc your using. From page 93, table 14- 2 of > > > > the PIC16F62X datasheet (which I assume you forgot to mention that > > you read but were confused :) ), > > > > > > Mode Freq > > > LP 32kHz or 200kHz > > > XT 100kHz, 2MHz or 4MHz > > > HS 8MHz, 10MHz or 20MHz > > > > > > You need to refer to the data sheet because you must include > > capacitors on each leg of the XTAL. The tables give the appropriate > > values. There is also a similar table if your using a ceramic > > resonator circuit. > > > > > > Scott Kellish > > > > > > ----- Original Message ----- > > > From: John Remington > > > To: > > > Sent: Saturday, January 31, 2004 5:49 PM > > > Subject: Re: [piclist] PIC Timing > > > > > > > > > XT > > > > > > --- honamos@y... wrote: > > > > I need to use an External Oscilator for my 16F628. Which > > setting > > > > should I use? LP, XT, HS, EC? > > > > > > > > What else do I need to do? > > > > > > > > Thanks for any help. > > > > > > > > > > > > > > > > > __________________________________ > > > > > > > > > to unsubscribe, go to http://www.yahoogroups.com and follow the > > instructions > > > > > > > > > Yahoo! Groups Sponsor > > > ADVERTISEMENT > > > > > > > > > > > > > > > > > > > > ------------------------------------------------------------------ -- > > ---------- > > > Yahoo! Groups Links > > > > > > a.. To > > > > ===== > My software has no bugs. Only undocumented features. > > __________________________________ |
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Re: PIC Timing - Phil - Feb 1 0:59:00 2004
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you know, shamoon, this is a bit like the movie Groundhog Day. About a month ago, you had exactly the same questions and got exactly the same answers. Since you obviously haven't solved your problem, you should try a different tack. Maybe get an o'scope and see if the crystal is oscillating or break down and buy a prebuilt proto board like one of the MELabs LabX boards. --- In , honamos@y... wrote: > Hey Chad, > I'm using a crystal. A 4MHz crystal... > > What now? > > Thanks for your help. > Shamoon > > --- In , Chad Russel <chadrussel@y...> wrote: > > If you have an oscillator and not a crystal, the you don't need any > > capacitors. Just hook it up to the OSCIN or OSC1 pin and set the > PIC > > to HS, XT or LP. > > > > --- honamos@y... wrote: > > > Well, > > > I have a 4MHz Oscillator. I tried XT, but it doesn't work. It > only > > > works on INTRC(IN) for some reason. I have the appropriate > capacitor > > > > > > values for XT, but it still doesn't work. > > > > > > Ideas? > > > > > > Shamoon > > > --- In , "Scott Kellish" <skellish@c...> > > > wrote: > > > > It depends on what freq Osc your using. From page 93, table 14- > 2 of > > > > > > the PIC16F62X datasheet (which I assume you forgot to mention > that > > > you read but were confused :) ), > > > > > > > > Mode Freq > > > > LP 32kHz or 200kHz > > > > XT 100kHz, 2MHz or 4MHz > > > > HS 8MHz, 10MHz or 20MHz > > > > > > > > You need to refer to the data sheet because you must include > > > capacitors on each leg of the XTAL. The tables give the > appropriate > > > values. There is also a similar table if your using a ceramic > > > resonator circuit. > > > > > > > > Scott Kellish > > > > > > > > ----- Original Message ----- > > > > From: John Remington > > > > To: > > > > Sent: Saturday, January 31, 2004 5:49 PM > > > > Subject: Re: [piclist] PIC Timing > > > > > > > > > > > > XT > > > > > > > > --- honamos@y... wrote: > > > > > I need to use an External Oscilator for my 16F628. Which > > > setting > > > > > should I use? LP, XT, HS, EC? > > > > > > > > > > What else do I need to do? > > > > > > > > > > Thanks for any help. > > > > > > > > > > > > > > > > > > > > > > __________________________________ > > > > > > > > > > > > to unsubscribe, go to http://www.yahoogroups.com and follow > the > > > instructions > > > > > > > > > > > > Yahoo! Groups Sponsor > > > > ADVERTISEMENT > > > > > > > > > > > > > > > > > > > > > > > > > > > ---------------------------------------------------------------- -- > -- > > > ---------- > > > > Yahoo! Groups Links > > > > > > > > a.. To > > > > > > > > > > > > ===== > > My software has no bugs. Only undocumented features. > > > > __________________________________ > > |
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Re: Re: PIC Timing - Chad Russel - Feb 1 1:24:00 2004
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:-p Is that Shamoon again? One more day until the blessed event http://www.punxsutawneyphil.com/ My sister lives about an hour away, and has threatened to take him out on Monday with her .30-06. Same spiel as before. Leads to xtal as short as possible. Parallel cut crystal. Use the crystal manufacturer's recommended capacitors. Don't try to power your coffee pot also with the output of the xtal. It's hard to keep these things from oscillating when they are not supposed to. :-p Good luck, Chad --- Phil <> wrote: > you know, shamoon, this is a bit like the movie Groundhog Day. About > > a month ago, you had exactly the same questions and got exactly the > same answers. Since you obviously haven't solved your problem, you > should try a different tack. Maybe get an o'scope and see if the > crystal is oscillating or break down and buy a prebuilt proto board > like one of the MELabs LabX boards. > > --- In , honamos@y... wrote: > > Hey Chad, > > I'm using a crystal. A 4MHz crystal... > > > > What now? > > > > Thanks for your help. > > Shamoon > > > > --- In , Chad Russel <chadrussel@y...> > wrote: > > > If you have an oscillator and not a crystal, the you don't need > any > > > capacitors. Just hook it up to the OSCIN or OSC1 pin and set the > > > PIC > > > to HS, XT or LP. > > > > > > --- honamos@y... wrote: > > > > Well, > > > > I have a 4MHz Oscillator. I tried XT, but it doesn't work. It > > > only > > > > works on INTRC(IN) for some reason. I have the appropriate > > capacitor > > > > > > > > values for XT, but it still doesn't work. > > > > > > > > Ideas? > > > > > > > > Shamoon > > > > --- In , "Scott Kellish" <skellish@c...> > > > > wrote: > > > > > It depends on what freq Osc your using. From page 93, table > 14- > > 2 of > > > > > > > > the PIC16F62X datasheet (which I assume you forgot to mention > > that > > > > you read but were confused :) ), > > > > > > > > > > Mode Freq > > > > > LP 32kHz or 200kHz > > > > > XT 100kHz, 2MHz or 4MHz > > > > > HS 8MHz, 10MHz or 20MHz > > > > > > > > > > You need to refer to the data sheet because you must include > > > > capacitors on each leg of the XTAL. The tables give the > > appropriate > > > > values. There is also a similar table if your using a ceramic > > > > resonator circuit. > > > > > > > > > > Scott Kellish > > > > > > > > > > ----- Original Message ----- > > > > > From: John Remington > > > > > To: > > > > > Sent: Saturday, January 31, 2004 5:49 PM > > > > > Subject: Re: [piclist] PIC Timing > > > > > > > > > > > > > > > XT > > > > > > > > > > --- honamos@y... wrote: > > > > > > I need to use an External Oscilator for my 16F628. Which > > > > > setting > > > > > > should I use? LP, XT, HS, EC? > > > > > > > > > > > > What else do I need to do? > > > > > > > > > > > > Thanks for any help. > > > > > > > > > > > > > > > > > > > > > > > > > > > __________________________________ > > > > > > > > > > > > > > > to unsubscribe, go to http://www.yahoogroups.com and follow > > > the > > > > instructions > > > > > > > > > > > > > > > Yahoo! Groups Sponsor > > > > > ADVERTISEMENT > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ---------------------------------------------------------------- > -- > > -- > > > > ---------- > > > > > Yahoo! Groups Links > > > > > > > > > > a.. To > > > > > > > > > > > > > > > > > ===== > > > My software has no bugs. Only undocumented features. > > > > > > __________________________________ > > ===== My software has no bugs. Only undocumented features. __________________________________ |
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