I use OS 1.6 and the doc htms set for 1.5, sorry no docs avail for 1.6 ??
enum eSpeed  
Available clock speeds. 
Enumerator: 
SPEED_LOW  Low speed.  
SPEED_VERY_LOW  Very low speed.  
SPEED_MEDIUM  Medium speed.  
SPEED_HIGH  High speed.  
SPEED_VERY_HIGH  Very high speed.  
if I call the change CPU speed:
UTIL_SetPll(SPEED_VERY_HIGH);  
this should give me the FASTEST possible speed !
but I only get speed 4 not 5
I tried this:
UTIL_SetPll(5);  // works give me max speed