read protect question

javi.ar · Joined: 17 Feb 2006 Posts: 59 Location: Argentina

I have one simple question, if I activate a code protect from read, will I be able to write again and again ? and one more, in the following writings will be still active the read protected even if I remove the fuse ? in 18f46K22 CCS ver 4.120. thanks a lot.

matteo · Joined: 31 May 2012 Posts: 5

A bulk erase should reset the protection bits but people often have issues reprogramming.

temtronic · Posted: Thu May 31, 2012 2:26 pm

I've never had any issues reprogramming any of my PICs in the past 25 years of using them(1000s of PICs). I do still use my Picstart Plus programmers.Any issues might be caused by 3rd party or homemade programmers.

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

He means the isse where you can only erase code protection config
bits with bulk erase, and bulk erase only works at +5v. So if you set
code protection on a +3.3v board you will have a problem.
Example:
http://www.ccsinfo.com/forum/viewtopic.php?t=20090
and
http://www.ccsinfo.com/forum/viewtopic.php?t=20620

temtronic · Posted: Thu May 31, 2012 7:57 pm

hmm..I'm still stuck in the 5 volt only mode...comes from my 7400 series days..so I never think of the 3 volt supply issues...