The PICkit2 User's Guide and the ICSP Guide have the answers to your =

questions. While I am not done studying these yet (I've had my PICkit2 for =

only about a week), I do specifically recall reading about, and seeing an =

illustration of, the connector pinout. Also, the question of what to do =

about isolating pins is in the ICSP Guide, along with info about !MCLR, etc.

Both of these documents are on the CD that came with the PICkit2. They are =

also available on the Microchip web site.

Richard

----- Original Message ----- =

From: "Tom=E1s =D3 h=C9ilidhe" <toe@lavabit.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Wednesday, June 18, 2008 7:36 PM
Subject: [PIC] Pins from Pickit 2 to 887


>
> I got the "Pickit2 Debug Express" yesterday. It consists of:
>
>    * Pickit2 device that looks like a small black hockey puck
>    * A small little prototype board that has an 887 in the middle of
> it, plus a few LED's and a variable resistor
>
> The 887 came shipped with a program on it that lights the LED's in a
> sequence.
>
> I've used the device with MPLAB and I'm happy with it, I can program it
> and debug it. I can halt the program and single-step through the
> instructions. It's great.
>
> Given that I'm so happy with this setup, I want to mimic it on my actual
> project board. Therefore I've been analysing the connections from the
> Pickit2 to the prototype board. There's 6 pins going from the Pickit2 to
> the small board. These 6 pins are unmarked on the Pickit2 (no name or
> symbol on them).
>
> On my project board, I'm going to have a 6-pin header for hooking up the
> Pickit2 to it.
>
> Using the continuity tester on my multimeter, I've determined, from left
> to right, that the Pickit2 pins go to the following on the 887:
>
>    1: ?? (Doesn't seem to be connected to anything)
>    2: RB6   /   ICSPCLK
>    3: RB7   /   ICSPDATA
>    4: GND
>    5 Vdd
>
>
>    6: MCLR   /   Vpp
>
> Here's my first questions:
>    Q1) On my project board, is it OK to hard-wire Vdd and GND to 5 V
> and 0 V respectively? Or does the Pickit 2 need to control them?
>
>    Q2) Can I just hardwire the MCLR pin straight to my 6-pin header, or
> do I need this pin to have a specific value for normal operation? (i.e.
> is it OK to have it floating when the Pickit2 isn't connected)?
>
> Regarding RB6 and RB7, well I was planning on using all the pins on port
> B for push buttons. One side of a pushbutton would go to the PIC pin,
> and the other would go straight to GND. I would then use the internal
> pull-up's so that I don't need a resistor on each of the pushbuttons.
>
>    Q3) Will I not be able to use RB6 and RB7 for pushbuttons when I'm
> in debug mode? Or will I not be able to use them at all because of the
> voltages applied to them by the Pickit2? (It's no big deal if I can't,
> it's just that the internal pull-up's are handy because they negate the
> need for extra resistors so that the pin is floating)
>
> It doesn't appear as if the Pickit2's leftmost pin is connected to
> anything, but if anyone knows better then please advise!
>
> Also if there's any caveats please let me know! Am I on the right track
> with this?
>
> -- =

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