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'[PIC] 16F877A HV programming help'
2005\04\04@073817 by Mike W

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A silly question no doubt but...
when programming the 877A does it need the xtal oscillator to be
installed / operating or can I just clock the data in without it ?
cheers, Mike W

p.s. sorry if this has been duplicated



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2005\04\04@075426 by olin_piclist

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Mike W wrote:
> A silly question no doubt but...

Well, um...

> when programming the 877A does it need the xtal oscillator to be
> installed / operating or can I just clock the data in without it ?

If it needed the crystal oscillator running, how could you ever program in a
circuit that used a different oscillator type?

The requirements for getting into programming mode are clearly spelled out
in the programming spec.


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Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

2005\04\04@080619 by Jan-Erik Soderholm

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Mike W wrote :

> A silly question no doubt but...
> when programming the 877A does it need the xtal oscillator to be
> installed / operating...

No.

How would those programmers where you just drop
nothing but the PIC into a ZIF socket work if so  ?

Jan-Erik.



2005\04\04@085531 by Wouter van Ooijen

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> when programming the 877A does it need the xtal oscillator to be
> installed / operating or can I just clock the data in without it ?

programming does not use the xtal/osc.

note: in some borderline cases the actual osc mode which is programmed
can have some adverse effect, but only when the programming
algoithm/hardware is already bordeline.

Wouter van Ooijen

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2005\04\04@091804 by Byron A Jeff
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On Mon, Apr 04, 2005 at 12:19:25PM +0100, Mike W wrote:
> A silly question no doubt but...

Why would yhou think it was silly?

> when programming the 877A does it need the xtal oscillator to be
> installed / operating or can I just clock the data in without it ?

No oscillator required. In fact if you have an oscillator installed you
must ensure that that you don't get too many clocks in between the time
that MCLR is in reset (0V) and the time that it reached programming mode
(13V)

BAJ

> p.s. sorry if this has been duplicated

No need to apologize. One of the purposes of this list is to ask questions.
The answers are in the data sheets and the programming specifications
though.

BAJ

2005\04\04@103712 by Herbert Graf

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On Mon, 2005-04-04 at 07:54 -0400, Olin Lathrop wrote:
> Mike W wrote:
> > A silly question no doubt but...
>
> Well, um...

It's actually not as silly a question as some may think.

There are chips out there (other then PICs) that need a running
oscillator to program. I believe the Atmel chips are some that require a
clock running (be it a crystal, RC oscillator or something else). TTYL


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2005\04\04@121851 by Russell McMahon

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>> when programming the 877A does it need the xtal oscillator to be
>> installed / operating or can I just clock the data in without it ?
>
> programming does not use the xtal/osc.

Unlike AVRs in ISP mode which can be left dead-in-the-water by an
inappropriate clock setting choice.


       RM

2005\04\04@145727 by Robin Abbott

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You can work fine with or without the crystal. All the data is clocked
directly on the progrmaming pins (RB6/RB7)

Robin Abbott

Forest Electronic Developments

01590 681511
+44 1590 681511 (phone/fax)

See our web pages : http://www.fored.co.uk



{Original Message removed}

2005\04\06@022435 by Chetan Bhargava

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Yes, that is true with 8051 and AVR based micros!

I was working with SP12 programmer for AVRs and by mistake I picked up
a ceramic filter instead of a resonator (they look alike). I had hours
of frustration with the programmer until I figured out that the chip
was not oscillating when attempting to program it.

--
Chetan Bhargava
Web: http://www.bhargavaz.net
Blog: http://microz.blogspot.com


On Apr 4, 2005 7:37 AM, Herbert Graf <spam_OUTmailinglist2TakeThisOuTspamfarcite.net> wrote:

> It's actually not as silly a question as some may think.
>
> There are chips out there (other then PICs) that need a running
> oscillator to program. I believe the Atmel chips are some that require a
> clock running (be it a crystal, RC oscillator or something else). TTYL

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