Hi Nigel,
The BDM clock is based on the target bus clock.
When you execute PLLSEL = 1, you change the bus clock.
Therefore you change the BDM communication speed.
Depending on your BDM debugging tool, you can have an option to get automatic speed and synchronization if the bus changes.
If the debugging tool doesn't change its clock, it cannot talk with the MCU anymore.
Cheers,
Alban.
Message Edited by Alban on 02-09-2006 04:50 PM