Re: Security Bit

[Saeed]

How can I make sure that the security bit can never be programmed/Set? because once this happens, it can't be erased using ISP and a parallel programmer is required to erase it!

Thanks

[Jan Waclawek]

In which chip?

[Andy Ayre]

Usually Flash Magic warns you before programming those kinds of security bits. Are you seeing a situation where it does not do that?

[Saeed]

I am sorry, I forgot to mention it: P89LPC932.
Thanks

[Saeed]

Andrew
The warning message only appears after the security bit has been set.  This is because I changed the PLC932 to a new chip and all was fine and the warning message is not given any more.  

Because students are using these boards, I was wondering if one can stop the security bit to be set again.
Thanks
Saeed

[Andy Ayre]

Which security bit is it? What warning message are you getting and when exactly?

[Saeed]

The Warning message is:
"You have selected at least one security bit which once programmed it cannot be erased using ISP, a parallel programmer is required.  Are you sure you wish to program the security bit(s)? "

This appears:  After you click the to download.

Bit 2 of all Block Sec. (in Section 4) become disabled too.

[Andy Ayre]

And if you click on No is the security bit programmed? Make sure you are using the latest version of FM as well.