RE: PLL change

Search the archives.  I posted some code that generates a reset using
the PLL.  Title was "PLPRCR and the locking mechanism" dated Feb 10th
2004.

Regards,
Allan

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of qty154
Sent: Thursday, October 13, 2005 3:36 AM
To: [email protected]
Subject: [MPC500] PLL change


Hello!

I want to achieve a board reset on my Wuerz MPC555 board that is 
initiated from software. I have one option, that is the watchdog. I 
simply don't update the key register and the watchdog, when expired, 
causes a hard reset. However, watchdog is not always enabled. Second
trial is to use the clock. I lock the MF, CSRC, LPM fields, and 
I try to change the MF. According to the manual it should cause a hard 
reset (because of the lock). However, nothing such actually happens.
Before the changes, PLPRCR and SCCR is the following:

PLPRCR: 0X00915080  SCCR: 0XAD20C040

After the changes (change MF and set LOLRE) the registers look like 
this:

PLPRCR: 0X006150C0  SCCR: 0XAD20C040

Why doesn't reset the MPC555?
How can I achieve reset?

Regards
Attila









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