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Discussion Groups | Piclist | Crystal Speed For PIC
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.
Crystal Speed For PIC - techy fellow - Nov 12 4:45:00 2003
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Hi,
I came across a project that requires a 16F84/P-10 and a 10 Mhz crystal. I do
not have any 16F84/P-10 but, I do have 16F84/P-20. Can I substitute 16F84/P-10 with the
-20 part and still use the 10Mhz crystal ?
Thanks in advance for the help.
Davis
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Re: Crystal Speed For PIC - Rick C. - Nov 12 7:08:00 2003
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Yes
techy fellow wrote: Hi, I came across a project that requires a 16F84/P-10 and a 10 Mhz crystal. I do not have any 16F84/P-10 but, I do have 16F84/P-20. Can I substitute 16F84/P-10 with the -20 part and still use the 10Mhz crystal ? Thanks in advance for the help.Davis |
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Re: Crystal Speed For PIC - Kees Stenekes - Nov 12 7:44:00 2003
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P-10 or P-20 is just an indication of the maximum frequency. Lower frequencies are allways possible. Kees --- techy fellow <> wrote: > Hi, > > I came across a project that requires a 16F84/P-10 > and a 10 Mhz crystal. I do not have any 16F84/P-10 > but, I do have 16F84/P-20. Can I substitute > 16F84/P-10 with the -20 part and still use the 10Mhz > crystal ? > > Thanks in advance for the help. > Davis > --------------------------------- > __________________________________ |
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Crystal Speed For PIC - techy fellow - Nov 12 10:35:00 2003
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Thanks alot for the info, guys. Moving forward, since higher speed MCUs can run at
lower frequency, I'll buy MCUs at highest available speed.
cheers,
Davis
Kees Stenekes <k...@yahoo.com> wrote: P-10 or P-20 is just an indication of the maximum
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Re: Crystal Speed For PIC - Rick C. - Nov 12 11:06:00 2003
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You have to keep in mind that if and when you run at a higher speed it will draw slightly more current, and the cost of higher speed devices is greater. Rick techy fellow wrote: > Thanks alot for the info, guys. Moving forward, since higher speed > MCUs can run at lower frequency, I'll buy MCUs at highest available > speed. cheers,Davis > > Kees Stenekes <> wrote: > > P-10 or P-20 is just an indication of the maximum > frequency. Lower frequencies are allways possible. > > Kees > > --- techy fellow <> wrote: > > Hi, > > > > I came across a project that requires a 16F84/P-10 > > and a 10 Mhz crystal. I do not have any 16F84/P-10 > > but, I do have 16F84/P-20. Can I substitute > > 16F84/P-10 with the -20 part and still use the 10Mhz > > crystal ? > > > > Thanks in advance for the help. > > Davis > > > > > Yahoo! Groups Sponsor ADVERTISEMENT [click here] > to unsubscribe, go to http://www.yahoogroups.com and follow > the instructions |
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Re: Crystal Speed For PIC - Phil - Nov 12 11:09:00 2003
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The F84 is an awfully old part. Unless its for a canned design with firmware you dont want to touch, you might want to look at the 16F628A. Lots more of everything, 20 Mhz and cheaper than the 84s... --- In , techy fellow <techyf@y...> wrote: > Thanks alot for the info, guys. Moving forward, since higher speed MCUs can run at lower frequency, I'll buy MCUs at highest available speed. > > cheers, > Davis > > Kees Stenekes <knalkeez@y...> wrote: > P-10 or P-20 is just an indication of the maximum > frequency. Lower frequencies are allways possible. > > Kees > > --- techy fellow <techyf@y...> wrote: > > Hi, > > > > I came across a project that requires a 16F84/P-10 > > and a 10 Mhz crystal. I do not have any 16F84/P-10 > > but, I do have 16F84/P-20. Can I substitute > > 16F84/P-10 with the -20 part and still use the 10Mhz > > crystal ? > > > > Thanks in advance for the help. > > Davis > > > > > > --------------------------------- > > > __________________________________ > > Yahoo! Groups SponsorADVERTISEMENT > > to unsubscribe, go to http://www.yahoogroups.com and follow the instructions > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > --------------------------------- > |
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RE: Re: Crystal Speed For PIC - Wouter van Ooijen - Nov 12 14:03:00 2003
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> The F84 is an awfully old part. Unless its for a canned design with > firmware you dont want to touch, you might want to look at the > 16F628A. Lots more of everything, 20 Mhz and cheaper than the 84s... And if you are (re)doing a design consider the dirt-cheap 14-pin 16F630. Even the version with A/D (16F676) is cheaper than a 16F628A. An it provides 8 A/D inputs, which is more than the 28-pin PICs have! Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products |
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Re: Re: Crystal Speed For PIC - techy fellow - Nov 12 21:32:00 2003
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Yep ! I agreed with you wholeheartedly, Phil. I only stocked up minimal quantities
of F84A parts (I've 5 pcs). This is because I am a newbie in electronics and I build
projects based on magazines (eg. Elektor, EPE, Nuts&Volts and Circuit Cellars). When
the project uses 16F84(A) part, I will have to use the same model else, the codes that
comes with it will not work with say, 16F628(A).
In fact, I faced lots of problems trying to buy small quantity for
MCUs. I'm sure some of you out there is facing the same problem. Just to quote you an
example, I bought 18 pcs of 16F628 (std MOQ per tube) but found out that 16F628A was
available (bought another 5 pcs). The problem I am facing is, I can't just buy one piece,
no one will want to sell just one piece to me in Singapore. After sourcing and bargaining,
I ended up with a deal buying at least 5 pcs per model. Over time, I've parts like
12C508A, 12C509A, 24LC256, 24LC512, 16F628, 16F628A, 16F84A, 16F877, 18F248, 18F452 and
AVR ATtiny12, AT90S1200, 2313, 8515, 8535, ATMega 64 and 128. 8051 family - AT89C2051 and
AT89C4051. A bunch of I2C chips PCF84. All at the highest available speed and industrial
grade (some commercial grade).
I'm sure some of the above MCUs are already outdated and replaced by enhanced model
(eg. AT90S2313 replaced by ATtiny2313). But, as always, I looked at it from the bright
side, at least, I have a source who is willing to supply different models and brands of
MCUs at 5 pieces MOQ so to speak. Hum... come to think about it, I can do business by
selling 1 piece of each model (in a package of minimum 10 models) to hobbysts. Hobbyists
will be happy cos' get to sample different models with minimal fuss and costs and I can
earn some money to fund my hobby. Anyone from Singapore interested in buying from me
??
cheers,
Davis Phil <p...@yahoo.com> wrote: The F84 is an awfully old part. Unless its for a canned design with |
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