Torfinn Klausen

QE128 - ICS ver.3 default setting, where do half the frequency go?

Discussion created by Torfinn Klausen on Feb 4, 2009
Latest reply on Feb 5, 2009 by bigmac
As said in the heading, I try to find out where half the systemclock go in the HCS08QE128.
The ICS is set as reset default in FEI mode, BDIV=01 or /2, RDIV=0 or /1. DRS=00, DMX32=0 -> FLL factor =512. Frequency is 31250Hz
From this I get the frequency to be (31250*512)/1/2=8MHZ, but the correct answer is 4MHz.
In the previous version of the ICS the DCO output is apparently divided by 2. But this is not specified in the version 3 of the ICS. Is this the reason for the half frequency?
I have studied the QE128 reference manual and the 'HCS08 Unleashed Designer's guide' but I can't figure any logical reason for the difference.
Could anyone put me in the correct direction for some further documentation?

Message Edited by Tbspd_TOK on 2009-02-04 07:07 AM