Texas Instruments MSP430x1xx User Manual page 115

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