LVP configuration and Verification Results

Itek · Guest

I'm using ICSP to program a 18F452. I have the fuse set for NOLVP but I receive a verification result indicating it was expecting NOLVP but the actual setting is LVP. All other expected fuse settings match the actual settings.

What do I need to do to correct this problem?

Thank you.

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

1. What programmer are you using ?

2. What is the Vdd voltage of the PIC on the board ?

Guest · Posted: Mon Nov 05, 2007 3:57 pm

I'm using the CCS ICD serial programmer and VDD is 5V.

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

In this thread, someone has a similar problem. He discovered that
he has an incorrect circuit connected to the MCLR pin.
http://www.ccsinfo.com/forum/viewtopic.php?t=19730
Check your board and see if you have that problem.

See this page in the CCS FAQ, which shows the acceptable circuit
for connecting a board to their ICD unit.
http://www.ccsinfo.com/faq.php?page=icd_connection

Also download the Microchip ICD2 poster. Read the warnings on
the right side of the sheet, called "Target Circuit Design Guidelines".
Don't use any of the components that have a red "X" on them.
http://ww1.microchip.com/downloads/en/DeviceDoc/51265e.pdf