Security bits

[wjt]

On several different Philips processors (P89 series), I eventually have problems with the security bits getting set without being asked to be set. I cannot even download a new program to the uP.

I am doing ICP programming with the MCB900, a PAB90X-1 and the latest version of Flash Magic

Two questions:

1. Why does this happen??
2. Do I just remove the fowled uP and put in a new one??

The problem starts with security bit2 getting set in several of the sectors. I find that Flash Magic cannot even clear the sectors that don't have security bits set. Is this a problem with the Flash memory in the Philips processors?

[Andy Ayre]

I'm not sure why this is happening.

If you go to ISP -> Additional Security Bits.. what settings are shown?

[geforce_zf]

Hi:
I meet the same problem.
In my opinion, FM with PAB90X-1 can't program the (security bit setted)LPC90X.

Solution: Erase the flash of LPC90X by other programmer, and program
the LPC90X with PAB90X-1 without set the security bit.