Searching \ for 'Running PIC16C84-4 @ 12MHz' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: techref.massmind.org/techref/microchip/devices.htm?key=16C
Search entire site for: 'Running PIC16C84-4 @ 12MHz'.

Truncated match.
PICList Thread
'Running PIC16C84-4 @ 12MHz'
1998\01\06@114336 by Rickard Gunie

flavicon
face
How fast can a PIC16C84 run ? I would like to run it @ 12MHz, have
anyone tried this ? I have done it with one chip, it broke after a
couple times of reprogramming. Is it possible to determine if the chip
can run @ 12Mhz without breaking it ?

1998\01\06@132654 by Rickard Gunie

flavicon
face
Paul Haas wrote:

> You'll have better luck if you start with a PIC16F84-10.  The -10
> means 10
> Mhz.  The -4 in the subject indicates 4 Mhz, so you were trying to run
> at
> 3 times the rated speed.  Running a -10 at 12Mhz is only 1.2 times out
> of
> spec.  (The 16F84 is an improved version of the 16C84, it was
> previously
> known as the 16C84A.  The 16C84 is discontinued.)

I used a -10 first, it worked fine, they broke by other reasons though,
and I only had two of them, so that's why I tried the -4 version. I'll
use the -10 chip when I get more of them, but it would be nice if it
worked with the -4 chip, scince they're twice as cheap as the -10 chips,
(when I buy them anyway).  The project i'm working on is a PONG game
using only a PIC16F84, 5 Resistors and a Chrystal, so I need the speed
to get better x-resolution on the screen.

{Quote hidden}

ok, intersting, Thanx

1998\01\06@135017 by Mike Keitz

picon face
On Tue, 6 Jan 1998 17:41:05 +0100 Rickard Gunie <spam_OUTe96rgTakeThisOuTspamEFD.LTH.SE>
writes:
>How fast can a PIC16C84 run ? I would like to run it @ 12MHz, have
>anyone tried this ? I have done it with one chip, it broke after a
>couple times of reprogramming. Is it possible to determine if the chip
>can run @ 12Mhz without breaking it ?

It won't cause the chip to "break" exceeding the clock speed.  It will
just suffer from "soft" malfunctions.  Maybe the last reprogramming
required one of the slower bits in the code EEPROM to work where the
other ones didn't.  I've had a F84-10 going at 16 MHz but it definitely
wouldn't do 20.  This will vary from chip to chip and from program to
program.

Of course there's no guarantee that the chip will work.  You may be able
to test each one at a speed faster than the final application requires
and reject the ones that don't work.  If the C84 chip could work reliably
faster than 10 MHz, Microchip would certainly advertise it.

>

1998\01\06@163918 by Rickard Gunie

flavicon
face
Paul Haas wrote:

> On Tue, 6 Jan 1998, Rickard Gunie wrote:
>
> > Paul Haas wrote:
>
> > ...  The project i'm working on is a PONG game
> > using only a PIC16F84, 5 Resistors and a Chrystal, so I need the
> speed
> > to get better x-resolution on the screen.
>
> And 2 capacitors to go with the chrystal?

works fine without any caps (I'm lazy), so far anyway, heh, is it
hazardous to skip'em ? (I get a nice picture on my TV, so it seems to
work to me)

> > > ...  So, use an external oscillator.
>
> My earlier suggestions blow the parts budget.  So ignore them.

heh, yes, scince this is just for fun, the budget is quite limited =)

> Write a blinking LED program, or get one from the net.  Make sure it
> works
> at 4Mhz. Then run it at 12 Mhz.  Hook the PIC up to a variable voltage
>
> power supply (an LM317T, a resistor and a potentiometer).  Find out
> the
> minimum and maximum operating voltages.  (But never go above 6
> volts!).

What voltage should I use then, the maximum or the minimum och in the
middle ? If I don't want it to get warm I guess that the current should
be as low as possible then ? (or would minimum current make the
oscillator to stop ?)

1998\01\07@120351 by Mike Keitz

picon face
On Tue, 6 Jan 1998 19:24:03 +0100 Rickard Gunie <.....e96rgKILLspamspam@spam@EFD.LTH.SE>
writes:
 The project i'm working on is a PONG game
>using only a PIC16F84, 5 Resistors and a Chrystal, so I need the speed
>to get better x-resolution on the screen.

If you don't need the data EEPROM, use one of the 18-pin EPROM PICs like
a 16C61, 16C55X, etc.  They have everything the X84 does except data
EEPROM.  Most are rated to about 20 MHz.  Sounds like an interesting
project.
>
>> If I remember correctly, the oscillator in the chip is one of the
>> first
>> things to fail at high speeds.  So, use an external oscillator.

Since the fastest F84 is only 10 Mhz, and most of the other PICs are at
least 20, I suspect the limitation is the code EEPROM.

 I think you want keep the temperature low
>> and
>> the supply voltage high (ie. if the part is normally rated at 4 to 6
>> volts, it is more likely to work at 6 volts than at 4 volts.)

This sounds right.  The F84 in HS mode is rated from 4.5 to 5.5V, at
slower speeds it can go down to 3V.

1998\01\07@131520 by Rickard Gunie

flavicon
face
Mike Keitz wrote:

> If you don't need the data EEPROM, use one of the 18-pin EPROM PICs
> like
> a 16C61, 16C55X, etc.  They have everything the X84 does except data
> EEPROM.  Most are rated to about 20 MHz.  Sounds like an interesting
> project.

Scince this is just for fun I don't want to get a new programmer and
lot«s of new chips, so i'll use the PIC16F84-10 instead.

1998\01\09@154651 by Marc Heuler

flavicon
face
Hi Rickard (Rickard Gunie), in <34B25EA1.3503E436spamKILLspamefd.lth.se> on Jan 6 you
wrote:

> How fast can a PIC16C84 run ? I would like to run it @ 12MHz, have
> anyone tried this ? I have done it with one chip, it broke after a
> couple times of reprogramming. Is it possible to determine if the chip
> can run @ 12Mhz without breaking it ?

Buy the 10 MHz Version. It will probably run 12 MHz without too much
trouble.

More... (looser matching)
- Last day of these posts
- In 1998 , 1999 only
- Today
- New search...