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4-3FLL+ Clock Module
Figure 4−1. MSP430x44x and MSP430x43x Frequency-Locked Loop
10−bit
Frequency
Integrator
DCO
+
Modulator
DC
Generator
OSCOFF
FNxSCG1
off
SCG0
Enable
PUC
Reset
ACLK
MCLK
XTS_FLL
DCOPLUS
FLL_DIVx
FLLDx
ACLK/n
CPUOFF
XT20FF
SELS
SELMx
10
M
f
Crystal
SMCLK
SMCLKOFF
XIN
XOUT
XT2IN
XT2OUT
XT2 Oscillator
f
DCO
+
−
f
DCO/D
/(N+1)
0
1
1
0
1
0
1
0
00
01
10
11
00
01
10
11
Divider
/1/2/4/8
Divider
/1/2/4/8
4
LFXT1 Oscillator
LF
XT
0 V
LFOff
XT1Off
0 V
f
DCOCLK
XCAPxPF