ssinfod

HCS08 : 9S08QG8 + RDIV

Discussion created by ssinfod on Feb 19, 2008
Latest reply on Feb 19, 2008 by Jim Donelson
Hi,
 
I'm currently starting with the HCS08 family and I have a question about the ICS module. (Internal Clock Source)
 
After a reset, the operating mode of the ICS module is set as FLL engaged Internal (FEI).
 
I would like to know if I can use the RDIV bits of ICSC1 register in the FEI mode ? How does the RDIV bits works in the FEI mode ?
 
Is that right to say the following ? :
RDIV = 000 -> fIRC = 31.25 k Hz
RDIV = 001 -> fIRC = 32.37 k Hz
RDIV = 010 -> fIRC = 33.48 k Hz
RDIV = 011 -> fIRC = 34.60 k Hz
RDIV = 100 -> fIRC = 35.71 k Hz
RDIV = 101 -> fIRC = 36.830 k Hz
RDIV = 110 -> fIRC = 37.95 k Hz
RDIV = 111 -> fIRC = 39.0625 k Hz
 
Where each bit of RDIV adds : (39.0625 k - 31.25 k) / 7 = 1.11 K Hz
 
Note :
The definition of the RDIV from the datasheet is :
Reference Divider — Selects the amount to divide down the FLL reference clock selected by the IREFS bits. Resulting frequency must be in the range 31.25 kHz to 39.0625 kHz.
 
Thanks for your answer.
 
 
 
 
 
 
 
 

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