6.3 Operating Modes
The MSP430 has one active mode and seven software-selectable low-power modes of operation. An interrupt event can wake up the device from low-power modes LPM0 through LPM4, service the request, and restore back to the low-power mode on return from the interrupt program. Low-power modes LPM3.5 and LPM4.5 disable the core supply to minimize power consumption.
The following eight operating modes can be configured by software:
- Active mode (AM)
- Low-power mode 0 (LPM0)
- CPU is disabled
- ACLK active
- MCLK disabled
- SMCLK optionally active
- Complete data retention
- Low-power mode 1 (LPM1)
- CPU is disabled
- ACLK active
- MCLK disabled
- SMCLK optionally active
- DCO disabled
- Complete data retention
- Low-power mode 2 (LPM2)
- CPU is disabled
- ACLK active
- MCLK disabled
- SMCLK optionally active
- DCO disabled
- Complete data retention
- Low-power mode 3 (LPM3)
- CPU is disabled
- ACLK active
- MCLK and SMCLK disabled
- DCO disabled
- Complete data retention
- Low-power mode 4 (LPM4)
- CPU is disabled
- ACLK, MCLK, SMCLK disabled
- Complete data retention
- Low-power mode 3.5 (LPM3.5)
- RTC operation
- Internal regulator disabled
- No data retention
- I/O pad state retention
- Wake-up input from RST, general-purpose I/O, RTC events
- Low-power mode 4.5 (LPM4.5)
- Internal regulator disabled
- No data retention
- I/O pad state retention
- Wake-up input from RST and general-purpose I/O