Print Page - Re: Security Bit

Title: Re: Security Bit
Post by: Saeed on October 20, 2005, 05:51:49 AM

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

Title: Re: Security Bit
Post by: Jan Waclawek on October 20, 2005, 06:40:06 AM

In which chip?

Title: Re: Security Bit
Post by: Andy Ayre on October 20, 2005, 07:47:21 AM

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

Title: Re: Security Bit
Post by: Saeed on October 20, 2005, 08:19:42 AM

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

Title: Re: Security Bit
Post by: Saeed on October 20, 2005, 08:27:12 AM

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

Title: Re: Security Bit
Post by: Andy Ayre on October 20, 2005, 08:32:12 AM

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

Title: Re: Security Bit
Post by: Saeed on October 20, 2005, 08:48:22 AM

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.

Title: Re: Security Bit
Post by: Andy Ayre on October 20, 2005, 08:51:13 AM

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

Flash Magic Forum

In-System Programming Support => LPC9xx/LPC9xxx => Topic started by: Saeed on October 20, 2005, 05:51:49 AM