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'[PIC]: MPLAB ICE2000'
2001\02\09@065649 by Michael Rigby-Jones
2001\02\09@080420 by Kevin Blain
2001\02\09@081044 by Michael Rigby-Jones

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Perhaps I should have mentioned the CPU I was emualting...Doh!

It's a 16F877.  On a related note, we need 3.3 volt capability so we are
going to need the 16LF877.  The standard chip is only specced down to 4
volts. I'm guessing this is limited because of the onboard Vpp generator?
Or are there probably other major differences?

> {Original Message removed}

2001\02\09@092742 by Gordon Varney (personal)

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The real problem with 3.3V is not the ICE, it's the clock frequency. The
16F877 will have intermittent and sometimes severe reactions to high clock
frequencies at low voltages. The part will work fine at 20Mhz using 5V. But
at 4V you have to drop to 10Mhz, and at 3.3V you will have to slow down to
4Mhz. Check the Spec's in the data book, It's all hidden in there.

I'm not saying it won't work, but I have never made it work correctly

Gordon Varney

> Perhaps I should have mentioned the CPU I was emualting...Doh!
>
> It's a 16F877.  On a related note, we need 3.3 volt capability so we are
> going to need the 16LF877.  The standard chip is only specced down to 4
> volts. I'm guessing this is limited because of the onboard Vpp generator?
> Or are there probably other major differences?
>

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2001\02\09@141940 by Michael Rigby-Jones

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Ahh, the light begins to shine!  I am indeed working at 20MHz.  Does this
mean I won't be able to hit 20 Mhz with a 16LF877 part running at 3.3volts?

> {Original Message removed}

2001\02\09@143938 by Dipperstein, Michael

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Take a look at page 152 (figure 15-2) of the PICLF87X.  It shows the
relationship between voltage and maximum frequency.

-Mike
{Original Message removed}

2001\02\11@205523 by o-8859-1?Q?K=FCbek_Tony?=

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Hi,
I can concure that the speed is very inportant when using the
ICE with 3.3 V. Myself I tried using the module for the 18x
series with 7.3728 Mhz * 4 ( PLL ) but even though it works
perfectly in 5V nothing worked with 3.3. V, however when disabling
the PLL and let it run 1:1 at 7.3728 things got brighter again :)
( and yeah BTW howcome the ICE200 for 18x series will *only* work
to 25Mhz ...very clever Microship.....yeah I know you can push it
but running at 40 Mhz..I doubt it..)


/Tony


Tony Kübek, Flintab AB            
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2001\02\12@025830 by Michael Rigby-Jones

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Thanks for the info.  I guess I should've RTFM :o)

Mike

{Quote hidden}

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