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Basic Clock Module Registers
4-15
Basic Clock Module
DCOCTL, DCO Control Register
76543210
DCOx MODx
rw−0 rw−1 rw−1 rw−0 rw−0 rw−0 rw−0 rw−0
DCOx
Bits
7-5
DCO frequency select. These bits select which of the eight discrete DCO
frequencies of the RSELx setting is selected.
MODx
Bits
4-0
Modulator selection. These bits define how often the f
DCO+1
frequency is
used within a period of 32 DCOCLK cycles. During the remaining clock
cycles (32−MOD) the f
DCO
frequency is used. Not useable when DCOx=7.
BCSCTL1, Basic Clock System Control Register 1
76543210
XT2OFF XTS DIVAx XT5V RSELx
rw−(1) rw−(0) rw−(0) rw−(0) rw−0 rw−1 rw−0 rw−0
XT2OFF
Bit 7 XT2 off. This bit turns off the XT2 oscillator
0 XT2 is on
1 XT2 is off if it is not used for MCLK or SMCLK.
XTS
Bit 6 LFXT1 mode select.
0 Low frequency mode
1 High frequency mode
DIVAx
Bits
5-4
Divider for ACLK
00 /1
01 /2
10 /4
11 /8
XT5V
Bit 3 Unused. XT5V should always be reset.
RSELx
Bits
2-0
Resistor Select. The internal resistor is selected in eight different steps.
The value of the resistor defines the nominal frequency. The lowest
nominal frequency is selected by setting RSELx=0.