
...the world's most energy friendly microcontrollers
Figure 3.1. Diagram of EFM32G
Gecko
Core and Memory
Clock Management
High Frequency
High Frequency
Energy Management
ARM Cortex ? -M3 processor
Memory
Protection
Unit
Crystal
Oscilla tor
RC
Oscilla tor
Voltage
Regulator
Voltage
Comparator
Low Frequency
Crystal
Oscilla tor
Low Frequency
RC
Oscilla tor
Flash
Program
Memory
RAM
Memory
Debug
Interface
DMA
Controller
Watchdog
Oscillator
Power-on
Reset
Brown-out
Detector
32-bit bus
Peripheral Reflex System
Serial Interfaces
I/O Ports
Timers and Triggers
Analog Interfaces
Security
USART
UART
External
Bus
Interface
General
Purpose
I/O
Timer/
Counter
Peripheral
Reflex
System
ADC
DAC
AES
Low Energy
Timer ?
Real Time
Counter
Low
Energy
UART?
I 2 C
External
Interrupts
Pin
Reset
Pulse
Counter
Watchdog
Timer
LCD
Controller
Analog
Comparator
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 EFM32G, see Table 3.1 (p. 8) . The
EFM32G 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) ).
2011-04-12 - d0001_Rev1.10
7
www.energymicro.com