In-circuit Serial Programming of 64 pin TQFP-type PIC18F6520 using Self powered JDM?

I have a self powered JDM programmer. It can be connected to my desktop as well as to laptop. Presently I am using my laptop for programming PIC16F72. JDM has following pin-type selector: 12, 18, 20, 28 and 40 pins. The socket is ZIF type. So I cannot use it to program TQFP (Quad type miniature PIC). I want to do ICSP of PIC18F6520 and PIC18F8520. IC-Prog does not have these devices on the device select menu. I have connected the JDM to my laptop through RS232 port. As IC-Prog does not have above devices, I selected PIC18F6620... a similar device. I tried to identify VPP, VDD, VSS, PGD, PGC on the ZIF in 40 pin mode as well as on my PIC18F6520. I connected these together. I also connected PGM to GND. The voltage I get on VPP is 2.54 V. After programming, verification fails everytime. PS: When I use the same technique to program PIC16F72 the programming is successful. Meaning I put JDM in 28 pin mode. Then I identify VPP, VDD, VSS, PGD and PGC on the ZIF socket. Then I connect these wires to appropriate pins on PIC16F72 on the bread board. The programming is successful. Thanking you in anticipation, M Vinod Kumar

seandogue8 years ago
Honestly, I'd suggest you contact JDM and perhaps PIC for tech support directly. They will probably be able to help you faster than anyone else.