Can't program PIC18F452

[lumstar]

Hello everyone,

I am unable to program a PIC18f452 with a jdm programmer (http://www.obddiag.net/prog2455.html).

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 connected RB5(pgm) and VSS on the pic to ground in series with a 10K resistor.

With 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? MCLR seems to be above 12V and I have tried and external supply for the VDD (+5V) voltage. Does the PIC18F452 have stricter MCLR voltage requirements than something like the PIC16F84a?

Thanks for your time!

Stephen

[Alan]

I have not used that chip. I am not sure if this demo from Sparkfun will be applicable. (it isn't the same chip but the connection may be the same).
http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=75