Pickit 3 ICSP

[acestu]

Hi,

I was just wondering if anybody uses a Pickit 3 in circuit (ICSP) rather than stand alone, I am trying myself but I keep getting errors.

It works fine with the new Gui or MPLAB.

I think it might be how the circuit is altered on the target device ie on the MCLR you need to put a diode inline but I am not sure about caps.

I would be grateful for any advice.

Thanks In Advance
Acestu

[kersing]

Have you checked the precautions listed in PICkit3 quicksheet. It states where not to put capacitors.

Also, in MPLAB there are settings to use targer power or provide power (and what voltage) to the target. Have you set the command line switches accordingly?

[acestu]

Hi Kersing,

Yes I have diagram with Target precautions the only parts I have connected on MCLR are a 10k resister and a schotky diode, the power is used from the
targets power supply so does not need the pickit3's power switching on, Clock and Data pins have nothing connected to them.

One thing that I have noticed is that when the MCLR wire is connected the LCD turns to blocks and returns to normal when I remove the wire, I am just wondering if the breadboard power supply is insufficient to run both the target and pickit3 ?

thanks
Acestu

[kersing]

PICkit3 is powered by USB, not the target power, except for the Input/Output drivers. What diode are you using and how is it connected? Does the same hardware (PICkit3 and target board) work correctly with MPLAB?

[acestu]

Hi Kersing,

I have researched quite a bit on google and from what I gather from schematics etc a bat48 diode can be used, and the power on th pickit3 is only switchd on if you are programming a device that has no target power available....

I found this which has quite a bit of info: http://www.pantechsolutions.net/project ... r-pic-kit3


thanks
Acestu

[kersing]

I am using PICkit2 for in circuit programming a lot (from MPLAB) so I know how the power on these programmers works.

I am unclear on the way you use the diode in your hardware. Do you have a circuit diagram?

Reading your first message I get the impression PICkit3 can program your circuit using MPLAB. Is that right? If so, what are the PICkit3 settings in MPLAB?

[acestu]

Hi Kersing,

Yes the pickit 3 will work fine when I use it with MPLAB or the pickit3 gui,

I found this pic:

isolation.jpg (21.11 KiB) Viewed 6997 times

thanks
Acestu

[kersing]

The first thing I notice is the capacitor on MCLR. One of the precautions:
"Do not use capacitors on MCLR: they will prevent fast transitions of VPP."

However is the combination is working with MPLAB it should be able to work with Flowcode. Could you post the messages?

[acestu]

Hi Kersing,

Yes this is what I man there are different components on different schematics...I have no caps on my circuit just a resistor and diode anyway


cheers
Acestu

[acestu]

Hi,

If anybody is interested I have found this Webpage that has all the info you need for ICSP...

http://www.lirtex.com/embedded/microcon ... ogramming/


Thanks
Acestu

[Enamul]

Very useful link stuart