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'Help needed with 4 Mhz clock oscillator'
1999\05\03@124125 by Donald Kihenja

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1999\05\03@130250 by engelec

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Donald,

you can use almost any crystal up to 20 Mhz
using different then what originally you need
will effect on speed only you need to adjust your
delay routine. you do not have to use any crystal eider
use RC. you can also use your signal generator as well
make sure you have sign wave or can based oscillator.


Andre.




Donald Kihenja wrote:

> Hi there,I am new to design with the PIC. I am about to present a
> class LED driving demo using a PIC 16F84. I recently ordered my parts
> but realised I forgot to order the 4Mhz clock oscillator. I don't have
> enough time (three days) to wait for a mail ordered oscillator. Can I
> use a 4 Mhz signal from a signal generator instead. Any other
> alternatives? CoardiallyDonald.

1999\05\03@130632 by Sebastián Dols

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1999\05\03@144609 by Quentin

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This is actually an interesting question.
Does it have to be a sine wave like a xtal's? Or will a square wave
work?

Description for the OSC1/CLKIN pin is: "Oscillator crystal
input/external clock source input"

Anybody used a squarewave or any other logic clock source?

Quentin

Andre Abelian wrote:
you can also use your signal generator as well
> make sure you have sign wave or can based oscillator.

> Donald Kihenja wrote:
Can I
> > use a 4 Mhz signal from a signal generator instead. Any other
> > alternatives?

1999\05\03@145022 by Dave VanHorn
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> This is actually an interesting question.
> Does it have to be a sine wave like a xtal's? Or will a square wave
> work?

Works fine.  Check the spec though, for levels, rise and fall times, and
duty-cycle.
Old trick on the Z-80 was to run it on an asymmetrical clock, which let you
speed it up quite a bit beyond it's max with a 50% duty cycle clock.

1999\05\03@152357 by Donald Kihenja

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1999\05\03@192502 by Byron A Jeff

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>
> Hi there,
> I am new to design with the PIC. I am about to present a class LED =
> driving demo using a PIC 16F84. I recently ordered my parts but realised =
> I forgot to order the 4Mhz clock oscillator. I don't have enough time =
> (three days) to wait for a mail ordered oscillator. Can I use a 4 Mhz =
> signal from a signal generator instead. Any other alternatives?

Where are you? Go down to RatShack and buy a 3.58 Mhz colorburst crystal.
It'll run a little slower, but should be just fine.

BAJ

1999\05\03@205032 by David Covick

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>
>Where are you? Go down to RatShack and buy a 3.58 Mhz colorburst crystal.
>It'll run a little slower, but should be just fine.
>
>BAJ
>


The Radio Shack color burst crystal is a special order.....not stocked.

1999\05\04@040031 by Sebastián Dols

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1999\05\04@065229 by Byron A Jeff

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>
> >
> >Where are you? Go down to RatShack and buy a 3.58 Mhz colorburst crystal.
> >It'll run a little slower, but should be just fine.
> >
> >BAJ
> >
>
>
> The Radio Shack color burst crystal is a special order.....not stocked.
>

I hate that RatShack no longer carries stuff like that in store. The strange
thing is that they do stock a whole bunch of 74HTC type logic.

One day I'll grow up and understand their practices.

Bummer.

BAJ

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