Searching \ for 'in-circuit programming 16F84' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/microchip/devprogs.htm?key=programming
Search entire site for: 'in-circuit programming 16F84'.

Truncated match.
PICList Thread
'in-circuit programming 16F84'
1998\10\16@202033 by jim nestor

picon face
I've been struggling for a week now trying to do in-circuit programming
with an ITU Pic-1 programmer & a couple of different PIC protoboards.

By connecting the Pic-1 header to appropriate points on the protoboard, I
should be able to (1) program the 16F84, then (2) run the program.
I seem to be able to do either but not both as follows.

The Pic-1 expects to have control over the MCLR line on the PIC. My
protoboards either tie the MCLR to VCC directly or through a 10k resistor.
By opening that circuit and connecting it to the VPP programming voltage
and GND, RB6 & RB7 lines on the Pic-1, I am able to program the 16F84.

Unfortunately, the protoboard won't run the program that way. I need to
restore the VCC to MCLR connection. Using jumper cables between the Pic-1
and protoboard, and switching them around betwen program and run modes
seemed to work.

My hope was that I could do it with a SPDT switch on the protoboard. That
would mean I could switch between modes with the flip of a single switch. I
tried to kep the leads short and soldered it up, but it dosn't work.

Has anybody on the list actually got a development system working with a
simple switch arrangement for in-circuit programming and execution of
program code in the target system?

Jim, WK8G
spam_OUTnestojiTakeThisOuTspamhome.com

1998\10\16@221538 by Regulus Berdin

flavicon
face
jim nestor wrote:
> The Pic-1 expects to have control over the MCLR line on the PIC. My
> protoboards either tie the MCLR to VCC directly or through a 10k resistor.
> By opening that circuit and connecting it to the VPP programming voltage
> and GND, RB6 & RB7 lines on the Pic-1, I am able to program the 16F84.

I think MCLR needs a series diode from the Vcc to work to be able to
program in in-circuit to prevent 12V going to the Vcc.

Reggie

1998\10\16@224248 by Eduardo Rivera

flavicon
face
    JP1 is used for in-system programming of your protoboards. All signals
required are provided by the header.

>>My hope was that I could do it with a SPDT switch on the protoboard. That
>>would mean I could switch between modes with the flip of a single switch. I
>>tried to kep the leads short and soldered it up, but it dosn't work.
------>
   For on board programming,your protoboards must provide a means of
isolating  all the corresponding pins of the target PIC chip from the
other parts of your own design. The simplest way considering you are using
a breadboard is to connect 2 sets of 5 sections of DIP switches so they
will be one set closed to your circuit for normal operation and the other
set open. For programming purposes,simply close the DIP switches from the
ITUPIC programmer and open the ones from your design.
Only one set of switches is to  be closed at the same time.  For normal
operation (RUN) of your circuit, the set of DIP switches going to your own
desing must be closed.

Best wishes
____________EDUARDO_________
         ________  ________  ________
        /         /       / /       /
       /_____    /_______/ /_______/
      /         /  \      / \
     /________ /    \    /   \
     ICQ# 10909825   \_ /     \___________
     .....eriveraKILLspamspam@spam@umemphis.campus.mci.net

1998\10\17@014210 by paulb

flavicon
face
Jim Nestor wrote:

> Has anybody on the list actually got a development system working with
> a simple switch arrangement for in-circuit programming and execution
> of program code in the target system?

 You bet! http://www.dontronics.com/dt001.html
--
 Cheers,
       Paul B.

1998\10\17@234032 by Don McKenzie

flavicon
face
Paul B. Webster VK2BZC wrote:
>
> Jim Nestor wrote:
> > Has anybody on the list actually got a development system working with
> > a simple switch arrangement for in-circuit programming and execution
> > of program code in the target system?
>
>   You bet! http://www.dontronics.com/dt001.html
> Cheers, Paul B.

Thanks again Paul. :-)
I designed this system and had a commercial version up and running in
Feb-95 after chatting with David Tait on the old MicroChip BBS.

In May-97, with the help of Antti Lukats, the Simmstick version was
introduced and there are now thousands of happy users.

We have had our own Simmstick list server for some time now, and
distributors are available in many countries.
This design has a 4PDT switch to get from program to run. What could be
simpler???

PIC16x84 Software drivers have been done by Nigel Goodwin and Andrew
Jarman, that cover DOS, w9x, and NT.
See Don's Download Dungeon: http://www.dontronics.com/download.html

other drivers known to work on the dt001 board are:
Octavio Nogueira of TATO Computers
www.geocities.com/SiliconValley/Pines/6902/
and:
Bojan Dobaj's P16PRO PIC programmer
http://www.geocities.com/SiliconValley/Peaks/9620/

Don McKenzie  donspamKILLspamdontronics.com   http://www.dontronics.com
For more details, send a blank message to .....infoKILLspamspam.....dontronics.com
or EraseMEsimstickspam_OUTspamTakeThisOuTdontronics.com or basicsspamspam_OUTdontronics.com

1998\10\19@034410 by Dr. Imre Bartfai

flavicon
face
Hi,

I took part on a Microchip seminar. I asked why that series diode
(mentioned below) is omitted from the newer manual. They said the opening
voltage causes a difference between the voltage levels of MCLR and Vdd and
it is not allowed (or use a Schottky). The 10k series resistor is o.k. BTW
I use jumpers and/or dip switches in my designs allowing to separate the
PIC from the other part of the circuit in case of ISP.

Imre


On Sat, 17 Oct 1998, Regulus Berdin wrote:

{Quote hidden}

1998\10\19@115506 by Peter L. Peres

picon face
On Mon, 19 Oct 1998, Dr. Imre Bartfai wrote:

> Hi,
>
> I took part on a Microchip seminar. I asked why that series diode
> (mentioned below) is omitted from the newer manual. They said the opening
> voltage causes a difference between the voltage levels of MCLR and Vdd and
> it is not allowed (or use a Schottky). The 10k series resistor is o.k. BTW
> I use jumpers and/or dip switches in my designs allowing to separate the
> PIC from the other part of the circuit in case of ISP.

Actually reading the data sheet would have told you why: MCLR is to be
within 0.4 volts of +Vcc for operation. A Si diode drops more than that, a
Shottky less.

Peter

More... (looser matching)
- Last day of these posts
- In 1998 , 1999 only
- Today
- New search...