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Figure 2−10. MSP430x1xx Operating Modes For Basic Clock System
WDT
Time Expired, Overflow
WDT Active,
Security Key Violation
CPUOFF = 1
SCG0 = 0
SCG1 = 0
LPM0
CPU Off, MCLK Off,
SMCLK On, ACLK On
CPUOFF = 1
SCG0 = 1
SCG1 = 0
LPM1
CPU Off, MCLK Off,
SMCLK On, ACLK On
DC Generator Off if DCO
not used in active mode
SCG1
SCG0 OSCOFF CPUOFF
0
0
0
0
0
0
0
1
0
1
0
0
1
1
0
1
1
1
RST/NMI
V CC On
Reset Active
POR
WDTIFG = 0
WDTIFG = 1
PUC
RST/NMI is Reset Pin
WDTIFG = 1
WDT is Active
Active Mode
CPU Is Active
Peripheral Modules Are Active
CPUOFF = 1
SCG0 = 1
CPUOFF = 1
SCG1 = 1
SCG0 = 0
SCG1 = 1
LPM2
CPU Off, MCLK Off, SMCLK
Off, DCO Off, ACLK On
Mode
0
Active
CPU is active, all enabled clocks are active
1
LPM0
CPU, MCLK are disabled
SMCLK , ACLK are active
1
LPM1
CPU, MCLK, DCO osc. are disabled
DC generator is disabled if the DCO is not used for
MCLK or SMCLK in active mode
SMCLK , ACLK are active
1
LPM2
CPU, MCLK, SMCLK, DCO osc. are disabled
DC generator remains enabled
ACLK is active
1
LPM3
CPU, MCLK, SMCLK, DCO osc. are disabled
DC generator disabled
ACLK is active
1
LPM4
CPU and all clocks disabled
System Resets, Interrupts, and Operating Modes
Operating Modes
RST/NMI
NMI Active
CPUOFF = 1
OSCOFF = 1
SCG0 = 1
SCG1 = 1
LPM4
CPU Off, MCLK Off, DCO
Off, ACLK Off
DC Generator Off
LPM3
CPU Off, MCLK Off, SMCLK
Off, DCO Off, ACLK On
DC Generator Off
CPU and Clocks Status
2-15
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