米6体育平台手机版

SLASEB7D June 2017 – December 2020

PRODUCTION DATA

9.5 Operating Modes

The MCU 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 to LPM4, service the request, and return 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. Table 9-1 lists the operating modes and the clocks and peripherals that are available in each.

Note:

XT1CLK and VLOCLK can be active during LPM4 if requested by low-frequency peripherals such as RTC or WDT.

Table 9-1 Operating Modes

MODE	AM		LPM0		LPM1	LPM2	LPM3	LPM4	LPM3.5	LPM4.5
MODE	ACTIVE	ACTIVE, FRAM OFF⁽¹⁾	CPU OFF⁽²⁾		CPU OFF	STANDBY	STANDBY	OFF	RTC ONLY	SHUTDOWN WITH SVS	SHUTDOWN WITHOUT SVS
Maximum system clock	16 MHz		16 MHz		16 MHz	50 kHz	50 kHz	0⁽³⁾	50 kHz	0⁽³⁾
Typical current consumption, T_A = 25°C	103 µA/MHz	65 µA/MHz	70 µA at 1 MHz		35 µA at 1 MHz	0.7 µA	0.4 µA	0.3 µA	0.25 µA	0.2 µA	0.02 µA
Typical wake-up time	N/A		instant		6 µs	6 µs	7 µs	7 µs	250 µs	250 µs	1000 µs
Wake-up events	N/A		all		all	LF, RTC, I/O, Comp	LF, RTC, I/O, Comp	I/O, Comp	RTC, I/O	I/O
CPU	on		off		off	off	off	off	reset	reset
USS	on		on		off	off	off	off	reset	reset
LEA	on		on⁽¹⁰⁾	off	off	off	off	off	reset	reset
FRAM	on	off⁽¹⁾	standby (or off⁽¹⁾)		off	off	off	off	off	off
High-frequency peripherals	available		available		available	off	off	off	reset	reset
Low-frequency peripherals	available		available		available	available	available⁽⁴⁾	off	RTC MTIF	reset
Unclocked peripherals⁽⁵⁾	available		available		available	available	available⁽⁴⁾	available⁽⁴⁾	reset	reset
MCLK	on		on⁽¹⁰⁾	off	off	off	off	off	off	off
SMCLK	optional⁽⁶⁾		optional⁽⁶⁾		optional⁽⁶⁾	off	off	off	off	off
ACLK	on		on		on	on	on	off	off	off
Full retention	yes		yes		yes	yes	yes	yes	no	no
SVS	always		always		always	optional⁽⁷⁾	optional⁽⁷⁾	optional⁽⁷⁾	optional⁽⁷⁾	on⁽⁸⁾	off⁽⁹⁾
Brownout	always		always		always	always	always	always	always	always

(1) FRAM is disabled in the FRAM controller (FRCTL_A).

(2) Disabling the FRAM through the FRAM controller (FRCTL_A) allows the application to lower the LPM current consumption but the wake-up time increases when FRAM is accessed (for example, to fetch an interrupt vector). For a wakeup that does not involve FRAM (for example, a DMA transfer to RAM) the wake-up time is not increased.

(3) All clocks disabled

(4) See Section 9.5.2, which describes the use of peripherals in LPM3 and LPM4.

(5) Unclocked peripherals are peripherals that do not require a clock source to operate; for example, the comparator and REF, or the eUSCI when operated as an SPI slave.

(6) Controlled by SMCLKOFF.

(7) Activated SVS (SVSHE = 1) results in higher current consumption. SVS is not included in typical current consumption.

(8) SVSHE = 1

(9) SVSHE = 0

(10) Only while the LEA is performing a task enabled by the CPU during AM. The LEA cannot be enabled in LPM0.