Checkout TB013 "How to implement ICSP Using PIC16CXXX OTP MCUs" (aka
DS91013B)- this covers in-circuit programming of OTP parts but the interface
requirements would appear to be similar.

Richard

> -----Original Message-----
> From: Sean H. Breheny [mailto:shb7@CORNELL.EDU]
> Sent: Monday, September 06, 1999 10:04 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: serial programming of the f84
>
>
> Hi Israel,
>
> You are absolutely correct, you CAN re-program the 16F84 in-circuit.
>
> All you have to do is provide a means of connecting at least
> four of the
> 16F84's pins to your programmer. If your circuit can provide
> power,then
> this is all you need. If your programmer needs to provide
> power,then you
> need to run a wire for a fifth pin,too.
>
> Another consideration is that the programming connections
> cannot interfere
> with the circuit's operation and vice versa. Usually this
> means that you
> will need to place a small resistor (a few K ohms) between
> three of the
> PIC's pins and the rest of the circuit. You then connect the
> programmer
> directly to the pin,and the resistor isolates the circuit. In
> some cases,it
> is also necessary to short the two oscillator pins together to prevent
> oscillator startup.
>
> There is probably an App Note on this,but I don't know. Maybe
> someone else
> can help?
>
> Sean
>
> At 09:53 AM 9/5/99 -0700, you wrote:
> >Hello,
> >
> >I am fairly new to the pic family of controllers and have a question.
> >Can i program the 16f84-04p in-circuit?
> >It is very important in my current app (micro-sized robot)
> to be able to
> program and debug
> >while the chip is in.  I hear lots of talk about removing
> the chip and
> inserting in a
> >programmer. I cannot do that every time i need to tweek some code.
> >Am i way off?  Do i need a differant chip?  Thank you for any help.
> >
> >Israel
>
> |
> | Sean Breheny
> | Amateur Radio Callsign: KA3YXM
> | Electrical Engineering Student
> \--------------=----------------
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