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'[PICLIST] ICSP + reset button'
2001\01\30@082726 by Jeszs

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Hi everyone,

I am building a PCB with a 16F84 heart.

Now I need to implement a connector for external ICSP (in circuit serial
programming). I also want to have a reset pushbutton.

I have in mind the schematics of the components to be attached to the MCLR
pin (diode + 5K resistor to nominal 5v, direct connection to programming
voltage, 13.8v, and pushbutton to ground through a 100 ohm reistor).

Can you give me some URL or some hint about the right way to do that?

Thank you very much in advance!
Ciao

--------------------
Jeszs Gonzalo
INSA, Ingenierma y Servicios Aeroespaciales, SA
Orense 4 - 9
Tel: +34-915561418
28020 Madrid (SPAIN)
--------------------

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2001\01\30@092212 by Vasile Surducan

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On Tue, 30 Jan 2001, Jeszs wrote:

> Hi everyone,
>
> I am building a PCB with a 16F84 heart.
>
> Now I need to implement a connector for external ICSP (in circuit serial
> programming). I also want to have a reset pushbutton.
>
> I have in mind the schematics of the components to be attached to the MCLR
> pin (diode + 5K resistor to nominal 5v, direct connection to programming
> voltage, 13.8v, and pushbutton to ground through a 100 ohm reistor).
>
> Can you give me some URL or some hint about the right way to do that?
>


You don't need any URL, however you may see the connection at:
http://www.geocities.com/vsurducan/auto.htm
Because the external ICSP haven't permanent connection you don't need any
100 ohm to ground if you don't push on reset button while programming is
on. Try diode from +V to MCLR and pic VCC, 4k7 or 10K from MCLR to VCC,
pussbutton directly to ground or if you want to be sure through a 220ohm
to GND.
Vasile

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