Datasheet

MSP430F21x2

SLAS578J –NOVEMBER 2007– REVISED JANUARY 2012

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Operating Modes

The MSP430 microcontrollers have one active mode and five software-selectable low-power modes of operation.

An interrupt event can wake up the device from any of the five low-power modes, service the request, and

restore back to the low-power mode on return from the interrupt program.

The following six operating modes can be configured by software:

• Active mode (AM)

– All clocks are active.

• Low-power mode 0 (LPM0)

– CPU is disabled.

– ACLK and SMCLK remain active. MCLK is disabled.

• Low-power mode 1 (LPM1)

– CPU is disabled ACLK and SMCLK remain active. MCLK is disabled.

– DCO dc-generator is disabled if DCO not used in active mode.

• Low-power mode 2 (LPM2)

– CPU is disabled.

– MCLK and SMCLK are disabled.

– DCO dc-generator remains enabled.

– ACLK remains active.

• Low-power mode 3 (LPM3)

– CPU is disabled.

– MCLK and SMCLK are disabled.

– DCO dc-generator is disabled.

– ACLK remains active.

• Low-power mode 4 (LPM4)

– CPU is disabled.

– ACLK is disabled.

– MCLK and SMCLK are disabled.

– DCO dc-generator is disabled.

– Crystal oscillator is stopped.