EFM32G-DK3550【PDF 88/467 页】KIT DEVELOPMENT EFM32 GECKO

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...the world's most energy friendly microcontrollers

in Table 10.3 (p. 88) . The wakeup triggers always return the EFM32 to EM0. Additionally, any reset

source will return to EM0.

Table 10.3. EMU Wakeup Triggers from Low Energy Modes

Peripheral

Wakeup Trigger

EM0

1

EM1

2

EM2

2

EM3

2

EM4

2

I C

I C

RTC

USART

UART

LEUART

2

2

TIMER

LETIMER

CMU

DMA

MSC

DAC

ADC

AES

Any enabled interrupt

Receive / transmit

Receive / transmit

Receive / transmit

Any enabled interrupt

Receive address recognition

Any enabled interrupt

Any enabled interrupt

Any enabled interrupt

Any enabled interrupt

Any enabled interrupt

Any enabled interrupt

Any enabled interrupt

Any enabled interrupt

-

-

-

-

-

-

-

-

-

-

-

-

-

-

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

-

-

Yes

-

Yes

-

Yes

-

-

-

-

-

-

-

-

-

-

-

Yes

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

PCNT

Any enabled interrupt

-

Yes

Yes

Yes

3

-

LCD

ACMP

VCMP

Pin interrupts

Pin

Power

Any enabled interrupt

Any enabled edge interrupt

Any enabled edge interrupt

Asynchronous

Reset

Cycle Off/On

-

-

-

-

-

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

-

Yes

Yes

Yes

Yes

Yes

-

-

-

-

Yes

Yes

Energy Mode 0/Active Mode

Energy mode 1/2/3/4

When using an external clock

1

2

3

10.3.4 Powering off SRAM blocks

The SRAM blocks can be individually disabled using the POWERDOWN bitfield in the EMU_MEMCTRL

register. To disable a block means that the power source is removed from the entire block, which will

conserve energy. Once a block has been disabled it can only be enabled by reset.

All the blocks can be turned off except the first one.

2011-04-12 - d0001_Rev1.10

88

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