...the world's most energy friendly microcontrollers
Figure 3.1. Diagram of EFM32GG
Giant Gecko
Core and Mem ory
Clock Managem ent
Energy Managem ent
ARM Cort ex ? -M3 processor
Mem ory
Prot ect ion
High Freq.
Cryst al
Oscillat or
High Freq.
RC
Oscillat or
Volt age
Regulat or
Volt age
Com parat or
Unit
Low Freq.
Cryst al
Oscillat or
Low Freq.
RC
Oscillat or
Brown-out
Det ect or
Power-on
Reset
Flash
Program
Mem ory
RAM
Mem ory
Debug
Int erface
w/ ETM
DMA
Cont roller
Ult ra Low Freq.
RC
Oscillat or
Back-up
Power
Dom ain
32-bit bus
Peripheral Reflex Syst em
Serial Int erfaces
I/O Port s
Tim ers and Triggers
Analog Int erfaces
Securit y
USART
Low
Energy
UART
UART
I 2 C
Ext . Bus
Int erface
Ext ernal
Int errupt s
TFT
Driver
General
Purpose
I/O
Tim er/
Count er
Low Energy
Tim er
Pulse
LESENSE
Real Tim e
Count er
Wat chdog
ADC
DAC
LCD
Cont roller
Operat ional
Am plifier
Hardware
AES
Count er
Tim er
USB
Pin
Reset
Pin
Wakeup
Back-up
RTC
Pulse
Count er
Note
In the block diagram, color indicates availability in different energy modes.
Figure 3.2. Energy Mode indicator
0 1 2 3
4
Note
In the energy mode indicator, the number n indicates Energy Mode n.
3.4 Energy Modes
There are five different Energy Modes (EM0-EM4) in the EFM32GG, see Table 3.1 (p. 8) . The
EFM32GG is designed to achieve a high degree of autonomous operation in low energy modes. The
intelligent combination of peripherals, RAM with data retention, DMA, low-power oscillators and short
wake-up times, makes it attractive to remain in low energy modes for long periods and thus saving
energy consumption.
Tip
Throughout this document, the first figure in every module description contains an Energy Mode
Indicator that shows in which energy mode(s) the module can operate (see Table 3.1 (p. 8) ).
2012-04-24 - Giant Gecko Family - d0053_Rev0.96
7
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