Ron,

(added the +AFs-PIC+AF0-: tag)

I typically leave all other I/O hooked up to the PIC, and run the PIC off my
project's 5 volt power supply as well.  I isolate MCLR with a diode and
resistor, and leave RB6 and RB7 dedicated to programming.  The PIC does need
5 volts to get programmed, and your programmer typically is limited in how
much power it can supply to your board, so I let the board supply handle
this task.

I've tried several times to get circuits working with isolating jumpers to
RB6 and RB7, but it was as they say +ACI-too much monkey business+ACI-.  One of
these days I'll be so strapped for I/O lines I'll have to make this work.

-- Lawrence Lile



----- Original Message -----
From: +ACI-Ron Hackett+ACI- +ADw-ronhackett+AEA-HOTMAIL.COM+AD4-
To: +ADw-PICLIST+AEA-MITVMA.MIT.EDU+AD4-
Sent: Monday, September 17, 2001 10:11 AM
Subject: ICSP Question


+AD4- I am designing a small ICSP circuit for a 16F84, and I have question.  I
+AD4- know I need to isolate or switch the RB6, RB7 and +AF8-MCLR lines, but I don't
+AD4- know whether I also need to remove power from all of the I/O circuitry
+AD4- attached to the PIC when the system is in programming mode.  If anyone can
+AD4- enlighten me, I would really appreciate it.
+AD4-
+AD4- Tnanks...  Ron
+AD4-
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