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confusing clock settings (DCOCTL) of MSP430G2553

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Hello all, 

         I'm getting confused with the configuration of the clock in my G2553 device. I tried to find in the forum regarding this post but couldnt clear my doubt.

 

1.The DCOCTL has DCOx and MODx fields but there is no table in the user guide mentioning the values to be given to these fields to get the required DCO Freq.

 

2. To get 1Mhz DCO clock I used

    DCOCTL = CALDCO_1MHZ;
    BCSCTL1 = CALBC1_1MHZ;
and I got 1MHz DCO.
 
3.When I check the DCOCTL and BCSCTL1 in the debugger the values are  
DCOCTL = 0xBC
BCSCTL1= 0x86
 
4. It means that there is modulation. I dont know why this modulation. 
About the calibration, is it to get the operation in the required range of temperature as I found in Data sheet?
 
5. I'm confortable with  FR series where the clock settings is so much easier to understand.
 
Please give your views in clearing this confusion!
Thanks in advance.
 
~ vin43
 
 

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