All in series?
I set mine up as follows, with ICSP working (so far)

MCLR ties directly to ICSP connector
MCLR to Cathode of Diode
Pullup resistor from Anode of diode to +5V
Small cap from Anode to GND.

This was on a 16F877, and ICSP has been working great so far.
The small cap may be optional, I had the space so I included it.

Lyle Hazelwood

----- Original Message -----
From: "Pic Dude" <picdude@AVN-TECH.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, June 26, 2002 3:25 PM
Subject: Re: [PIC]: Tait --> ICSP. Ready, set...


> Lemme think about this...
> - Prog MCLR floats, no problem.
> - Prog MCLR goes to >12V, the diode blocks this from the
>         app-circuit Vdd.
> - Prog MCLR goes to ground, the diode is now forward-biased
>         with the app-Vdd, and pretty much shorts to ground.
>         Ouch!
>
> Good idea.  I'll drop a few-K resistor in series with the
> diode, so I now have:
>         App-Vdd -to- diode -to- resistor -to- MCLR.
>
> Thanks much,
> -Neil.
>
>
>
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Sid Weaver
> Sent: Wednesday, June 26, 2002 5:06 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: Tait --> ICSP. Ready, set...
>
>
> Neril, I think MCLR has to go low during programming, not sure.  I would
use
> a pullup resistor on MCLR just to be safe.
>
> Sid
>
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