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Basic Clock Module Introduction
4-3
Basic Clock Module
Figure 4−1. Basic Clock Block Diagram
Divider
/1/2/4/8
DIVAx
MCLK
CPUOFF
DCOCLK
XIN
XOUT
DCOR
P2.5/Rosc
LFXT1 Oscillator
XT2IN
XT2OUT
XT2OFF
XT2 Oscillator
Divider
/1/2/4/8
DIVMx
SMCLK
SCG1
DIVSx
ACLK
VCC
Main System Clock
Auxillary Clock
Sub System Clock
DCO
DCOx
MODx
DC
Generator
SCG0 RSELx
off
SELS
1
0
SELMx
00
01
10
11
1
0
XT
OSCOFF XTS
LF
XT
1
0
1
0
Divider
/1/2/4/8
XT2CLK
Modulator
1
0
n
n+1
12pF
0 V
LFOff XT1Off
0 V
12pF
LFXT1CLK
Note: XT2 Oscillator
The XT2 Oscillator is not present on MSP430x11xx or MSP430x12xx
devices. The LFXT1CLK is used in place of XT2CLK.