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PICList Thread
'ICSP'
1998\08\20@153135 by Peter Schultz

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Hi All,
What is the simpliest way (hardware & software) to ICSP a 16F84 ?
Tank You,
Peter


'ICSP'
1999\05\26@033858 by Justin Grimm
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Hi all
Has anybody had any problems with in circuit serial programming?
Im going to implement it in a new pcb design. I take it you just
bring vdd,vss,rb6,rb7 and mclr out to a connector.
does anyone recommend a size of resistor to use for the design
in the 167x databook?
Thanks
Justin

1999\05\26@092730 by Octavio Nogueira

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> Hi all
> Has anybody had any problems with in circuit serial programming?
> Im going to implement it in a new pcb design. I take it you just
> bring vdd,vss,rb6,rb7 and mclr out to a connector.
> does anyone recommend a size of resistor to use for the design
> in the 167x databook?
> Thanks
> Justin
>

10K will work just fine.

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1999\05\26@095040 by PDRUNEN

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About how long does it take to serially program a 16F84 with the ROM
completed filled up?

I will be using the AC004004 adaptor on the PROMATE II by microchip.

Paul

In a message dated 99-05-26 09:27:58 EDT, you write:

<< > Hi all
> Has anybody had any problems with in circuit serial programming?
> Im going to implement it in a new pcb design. I take it you just
> bring vdd,vss,rb6,rb7 and mclr out to a connector.
> does anyone recommend a size of resistor to use for the design
> in the 167x databook?
> Thanks
> Justin
> >>

1999\05\26@100339 by Andy Kunz

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At 09:57 AM 5/26/99 -0300, you wrote:
>> Hi all
>> Has anybody had any problems with in circuit serial programming?
>> Im going to implement it in a new pcb design. I take it you just
>> bring vdd,vss,rb6,rb7 and mclr out to a connector.
>> does anyone recommend a size of resistor to use for the design
>> in the 167x databook?

I also recommend shorting out the OSC1 pin so it won't wiggle.

Andy
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  Montana Design Tech Support - http://www.montanadesign.com
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1999\05\26@111018 by Jack Shidemantle

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I've implemented ICSP on the 12C509 with no problems. Used 4.7k isolation
resistors, but I think 10k is the recommended value if you can do it
without affecting operation. 4.7k works fine for me. I'm using the Promate
II with the ICSP module. This module buffers everything to provide more
drive power.

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05/26/99 09:57 AM NST
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To: PICLISTspamKILLspamMITVMA.MIT.EDU
cc:
bcc:
Subject: Re: ICSP


> Hi all
> Has anybody had any problems with in circuit serial programming?
> Im going to implement it in a new pcb design. I take it you just
> bring vdd,vss,rb6,rb7 and mclr out to a connector.
> does anyone recommend a size of resistor to use for the design
> in the 167x databook?
> Thanks
> Justin
>

10K will work just fine.

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===================================================
.....nogueiraKILLspamspam.....propic2.com Ê Ê Ê Ê Ê Ê Ê Ê ÊICQ# 19841898
>From the creator of ProPic,ProPic 2 now much better
New ProPic 2 Êhomepage: Ê Ê Êhttp://www.propic2.com
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1999\05\26@155738 by Jamil J. Weatherbee

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10k usually is a good value, if your using the pin as an input to the pic
if output then you need to evaluate R based on what you are driving,
acceptable voltage drop and current etc.



On Wed, 26 May 1999, Justin Grimm wrote:

> Hi all
> Has anybody had any problems with in circuit serial programming?
> Im going to implement it in a new pcb design. I take it you just
> bring vdd,vss,rb6,rb7 and mclr out to a connector.
> does anyone recommend a size of resistor to use for the design
> in the 167x databook?
> Thanks
> Justin
>

1999\05\27@003651 by Justin Grimm

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Because Im using the c74 mainly for the PSP, I might not
use rb6 and rb7 for I/O, just for the ICSP, so in that case
I would probably just need to tie them to ground through
a 10k resistor wouldnt I ?
Also I take it that the chip would go immediately into pgm
mode on startup and wouldnt get a chance to start running the
program, I take it this is what you mean by tying osc1 to ground,
Andy.
Thanks
Justin Grimm



{Original Message removed}

1999\05\27@071803 by paulb

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Justin Grimm wrote:

> Because Im using the c74 mainly for the PSP, I might not use rb6 and
> rb7 for I/O, just for the ICSP, so in that case I would probably just
> need to tie them to ground through a 10k resistor wouldnt I?

 If you do not use them in your application, you define them as outputs
in your initialization, and you connect *nothing* to them (other than
the ICP connector and an unused pad in case you later *do* need to use
them for I/O).

 The only reason for 10k resistors is to permit them to be inputs
normally and inputs/ or outputs during ICP.  If you were to use them as
outputs, you would not be isolating them with resistors; you would
either consider the device they drive to constitute a trivial load, or
you would have to isolate them fully (via a jumper on the ICP connector)
during programming.

> Also I take it that the chip would go immediately into pgm mode on
> startup and wouldnt get a chance to start running the program, I take
> it this is what you mean by tying osc1 to ground, Andy.

 Certainly is what he meant.  Of course, this doesn't work for a 12C50x
when programmed for internal oscillator, but you've decided to use
something else.
--
 Cheers,
       Paul B.

1999\05\27@155355 by w. v. ooijen / f. hanneman

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With a not-too-slow programming tool/hardware 10mS/instruction =>
10 seconds for 1024k. Add somewhat for erase, communication overhead,
maybe verification.
Wouter.

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