Sean McCartan

MCF52259 Flashing with Battery Backup Connected

Discussion created by Sean McCartan on Aug 9, 2011
Latest reply on Jan 8, 2012 by TomE

I am using a Colfire MCF52259 processor with a 3.3V battery connected to the Vstby pin.


With the battery connected (and circuit powered), I am unable to 'flash' program the proccesor using a P&E Micro BDM.

If I remove the battery, the device programs without any issue.


I have also noticed the processor will not start-up if the standby battery voltage is slightly high (3.6V).


Is this 'normal' operation for these devices?