denny george

Relationship between ICG Filter Register and BusClock in SCM Mode

Discussion created by denny george on Mar 31, 2008
Latest reply on Apr 8, 2008 by denny george
Hello All,
 
Do anyone know the relationship between the ICG Filter Registers (ICGFLTU, ICGFLTL) value and the BusClock / DCO output freq  in SCM Mode.
 
I know that the default value of 0x00C0 will yield fICGOUT of 8MHz and BusClk of 4MHz.
 
Also BusClk= 0.5( fICGOUT) = 0.5( fICGDCLK/ R )
where R = Division Factor(R). Page 141 HCS908AWdatasheet
 
Datasheet states that "The ICGDCLK frequency can be varied from 8 MHz to 40 MHz by writing a new value into the filter registers (ICGFLTH and ICGFLTL)."
 
Now I want to set ICG Filter Registers (ICGFLTU, ICGFLTL) such that Busclk should be 8MHz.No where can I see the info relating to this filter register and DCO output freq.
 
Also refer the link of the post.
 
Regards,
Denn.

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