Re: In Circuit Programming of 16F84's

I do just this as I have surface mounted 16F84's on my boards.

All I did was....

Take my programmer (P16PRO, could be any other)

Solder wires onto the following pins
        RB6,
        RB7,
        MCLR
        0V
        5V

Take 5 these wires (Short, only about 10cm) and solder to the same pins on
the target board. (On my boards I have an extra connector to just plug it
in.)

I found it best to allow the programmer to power the target board as
powering the target from it's own supply meant I kept getting ground loops
and intermittent programming.

This is reliable and I've done loads so far using this method.

What I do with a prototype is build up my circuit as normal and add a small
5way connector of some kind to the prototype connected to the above
programming pins. Then I can

1: connect the cable to the programmer,
2: program the target,
3: disconnect the programmer,
4: connect my target power supply and see what happens :-)
5: Repeat if I've messed up or want to add more.

Simple. Make sure you read the Microchip application notes on in circuit
serial programming. You'll also find it helpful to add a small shottky diode
in series with a 10k resistor to the MCLR pin up to 5V (as shown on the app
notes) and connect the programming wire from the MCLR/Vpp pin directly to
your target processor MCLR pin. There have been other posts about this in
the archives.

Hope that helped.

Pete

> -----Original Message-----
> From: ext Simon Ethier [mailto:Seth889@STARTREKMAIL.COM]
> Sent: Thursday, March 29, 2001 4:25 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: In serial programming ?

> But each time I have to remove the PIC, re-program it and
> re-insert it in my
> test breadboard. But I know I can leave the PIC in my test
> breadboard and
> program in "in serial" or something like that .... Do anyone
> of you know how

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