Aaah, true. I tend to only think in terms of the PIC18 series these days.
I'll leave it to the PIC16 experts to answer your questions re the PIC16F872

 

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Buehler, Martin
Sent: 10 November 2004 10:02
To: Microcontroller discussion list - Public.
Subject: RE: [PIC]: reserved pins for ICD / ICD2

peter

thank you for your answer.

I think, this covers the combination of ICD2 and pic18fxxx chips.

but I use the 16f872, which has the RB3 pin marked PGM. this is usually
connected to the ICD (ICD1).

do I need this connection between ICD and RB3/PGM?

can the 16f872 also be used with ICD2?

does it only need RB6 and RB7 then?

thanx!
tino

************************************************************************
******************************

>-----Original Message-----
>From: Peter Moreton [mailto:peter.moreton@virgin.net]
>Sent: Wednesday, November 10, 2004 10:07 AM
>To: 'Microcontroller discussion list - Public.'
>Subject: RE: [PIC]: reserved pins for ICD / ICD2
>
>Martin,
>
>You only need to reserve RB6 & RB7 (PGC/PGD) & MCLR for the ICD2. RB5
is
>sometimes tied low to inhibit LVP, but in my experience this is not 
>strictly necessary, and the pin can be used as an IO pin. RB3 is not 
>used by the ICD2.
>
>I often use RB6  & RB7 for ICD-2 & as an IO port for switches etc.
>
>Peter Moreton
>
>
>
>
>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf Of
>Buehler, Martin
>Sent: 10 November 2004 08:28
>To: Microcontroller discussion list - Public.
>Subject: [PIC]: reserved pins for ICD / ICD2
>
>in my designs, i always reserved pins RB3, RB6 and RB7 for ICD
connection.
>
>do I really have to reserve them all for ICD connection?
>
>according to the ICD manual, RB6 and RB7 are used for ICD
communication,
>but
>RB3 is on the list of the ICD reserved pins. the ICD also has a
connector
>for RB3.
>
>in the ICD2 manual, I see nothing about using RB3.
>
>as I'm short on i/os, I don't like to waste pins in my actual design.
>
>can anybody tell me, which pins I have to reserve for ICD or ICD2 and
what
>restrictions I have?
>
>thank you very much.
>
>tino
>
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