Texas Instruments MSP430x1xx - Page 128

Basic Clock Module Registers
4-16
Basic Clock Module
BCSCTL2, Basic Clock System Control Register 2
76543210
SELMx DIVMx SELS DIVSx DCOR
rw−(0) rw−(0) rw−(0) rw−(0) rw−0 rw−0 rw−0 rw−0
SELMx
Bits
7-6
Select MCLK. These bits select the MCLK source.
00 DCOCLK
01 DCOCLK
10 XT2CLK when XT2 oscillator present on-chip. LFXT1CLK when XT2
oscillator not present on-chip.
11 LFXT1CLK
DIVMx
BitS
5-4
Divider for MCLK
00 /1
01 /2
10 /4
11 /8
SELS
Bit 3 Select SMCLK. This bit selects the SMCLK source.
0 DCOCLK
1 XT2CLK when XT2 oscillator present on-chip. LFXT1CLK when XT2
oscillator not present on-chip.
DIVSx
BitS
2-1
Divider for SMCLK
00 /1
01 /2
10 /4
11 /8
DCOR
Bit 0 DCO resistor select
0 Internal resistor
1 External resistor