Re: Security Bit

Started by Saeed, October 20, 2005, 05:51:49 AM

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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


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?

Embedded Systems Academy, Inc.
support at esacademy dot com

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?

Embedded Systems Academy, Inc.
support at esacademy dot com

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.

Embedded Systems Academy, Inc.
support at esacademy dot com