Problem with JDM and 18f452

[lumstar]

Hi All,

I'm having some trouble programming an 18f452 with the jdm programmer design found here: **broken link removed**.

I have succesfully programmed a pic16f84a using this programmer and PicPgm spftware, but cannot program an 18f452 chip with it.

The circuit I have connected the icsp to is as follows:

ICSP --> Pic18f452
------------------------
MCLR --> MCLR
VDD --> VDD1 and VDD2
GND --> VSS1 and VSS2
PGD --> RB7
PDC --> RB6
PGM --> Floating

I also put a 10k ohm resistor between RB5(pgm) and VSS on the pic.

Using this setup, PicPgm cannot identify the pic or program it. Using IC-Prog, verify fails at 0000h meaning nothing was programmed.

Any ideas? What am I doing wrong here?

Thanks for your time!

Stephen

 

[wp100]

Hi,

A long story short - but think its time you upgraded to the Pickit2 programmer - see this forum for loads of details about them.

A good diy clone is the Pickit2 Lite - but of course you need to program the 18F2550 chip first !

 

[lumstar]

Hi wp, thanks for the suggestion. However, I went with the JDM because I just need to program a bootloader onto a couple of pic18f452's and was hoping I could do it with something cheap and fast.

Since I don't need something for regular programming, does anyone have any troubleshooting tips for my jdm and Pic18f452 setup? If so they would be really appreciated.

Thanks again!
Stephen

 

[wp100]

Hi,

Just looked at my old parallel port programmer software and it does support the JDM (2) and the 18F452 - so might be worth a try.

https://www.qsl.net/dl4yhf/winpicpr.html

 

[lumstar]

I think I may have found the problem. In the schematic I built from a 5.1v and 6.2v zener is used to supply voltage to MCLR. I believe the 6.2 should be 8.2 in order to give the required 13 v (right now I would max out at 11.3). I am going to replace the 6.2v zener with an 8.2 and see what happens.

 

[lumstar]

Nope, that didn't fix it either. Although now the MCLR voltage is above 13 volts. Anyone have any insight?

 

[wajidaq]

hi! after long time i m facing same problem
please anyone help me
Lamstar ... did u find any solution about this problem because u have faced same problem such long time ago....


i need help........