EFM32 datasheet(13/261 Pages) SILABS

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3.2.4 EM2 and EM3 Power Domains

The EFM32GG11 has three independent peripheral power domains for use in EM2 and EM3. Two of these domains are dynamic and

can be shut down to save energy. Peripherals associated with the two dynamic power domains are listed in Table 3.1 EM2 and EM3

Peripheral Power Subdomains on page 13. If all of the peripherals in a peripheral power domain are unused, the power domain for

that group will be powered off in EM2 and EM3, reducing the overall current consumption of the device. Other EM2, EM3, and EM4-

capable peripherals and functions not listed in the table below reside on the primary power domain, which is always on in EM2 and

EM3.

Table 3.1. EM2 and EM3 Peripheral Power Subdomains

Peripheral Power Domain 1

Peripheral Power Domain 2

ACMP0

ACMP1

PCNT0

PCNT1

ADC0

PCNT2

LETIMER0

CSEN

LESENSE

VDAC0

APORT

LEUART0

LEUART1

LETIMER1

I2C0

I2C1

I2C2

IDAC

ADC1

ACMP2

ACMP3

LCD

RTC

3.3 General Purpose Input/Output (GPIO)

EFM32GG11 has up to 144 General Purpose Input/Output pins. GPIO are organized on three independent supply rails, allowing for

interface to multiple logic levels in the system simultaneously. Each GPIO pin can be individually configured as either an output or input.

More advanced configurations including open-drain, open-source, and glitch-filtering can be configured for each individual GPIO pin.

The GPIO pins can be overridden by peripheral connections, like SPI communication. Each peripheral connection can be routed to sev-

eral GPIO pins on the device. The input value of a GPIO pin can be routed through the Peripheral Reflex System to other peripherals.

The GPIO subsystem supports asynchronous external pin interrupts.

3.4 Clocking

3.4.1 Clock Management Unit (CMU)

The Clock Management Unit controls oscillators and clocks in the EFM32GG11. Individual enabling and disabling of clocks to all pe-

ripherals is performed by the CMU. The CMU also controls enabling and configuration of the oscillators. A high degree of flexibility al-

lows software to optimize energy consumption in any specific application by minimizing power dissipation in unused peripherals and

oscillators.

EFM32GG11 Family Data Sheet

System Overview

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