EFM32   microcontrollers include the most energy friendly peripherals and energy modes
Core and Memory
Clock Management
Energy Management
ARM Cortex M processor
Memory
Protection Unit
Embedded
Trace Macrocell
High Frequency
Crystal Osc
Low Frequency
Crystal Osc.
Brown-out
Detector
Voltage
Regulator
Voltage
Comparator
Brown-out
Detector
Flash Program
Memory
RAM
Memory
Debug
Interface
DMA
High Frequency
RC Oscilator
Low Frequency
RC Oscilator
Auxiliary
RC Osc
Power-on
Reset
Back-up
Power Domain
32-bit bus
PRS - Peripheral Re?ex System
Serial Interfaces
I/O Ports
Timers and triggers
Analog Interfaces
Security
USART
LEUART
I2C
External
Bus Intf.
External
Interrupts
GPIO
Timer/
Counter
Low Energy
Timer
Real Time
Counter
Pulse
Counter
12-bit
ADC
LCD
Controller
Operational
Ampli ers
HW
AES
UART
USB
TFT
Driver
GPIO
Wake-up
Pin
Reset
LE Sensor
Interface
Back-up
RTC
Watchdog
Timer
12-bit
DAC
Analog
Comparator
EFM32 with 3V power supply.
Application from memory.
Current consumption
Wake-up time
CPU (Cortex-M3/M0)
High frequency peripherals
Low frequency peripherals
Asynchronous peripherals
Full CPU and SRAM retention
Power-on Reset/Brown-out Detector
Wake-up events
EM0
Run Mode
150 μA/MHz
-
On
Available
Available
Available
On
On
Any
EM1
Sleep Mode
45 μA/MHz
0
-
Available
Available
Available
On
On
Any
EM2
Deep Sleep
0.9 μA
2 μs
-
-
Available
Available
On
On
32 kHz peripherals
EM3
Stop Mode
0.6 μA
2 μs
-
-
-
Available
On
On
Async IRQ, I2C slave
Analog Comparators
Voltage Comparators
EM4
Shutoff Mode
20 nA
160 μs
-
-
-
-
-
On
Reset, GPIO rising/
falling edge
16 memory and feature versions  (Available from: 2012)
ARM Cortex-M0 up to 32 MHz
Flash (KB):  4 to 32
RAM (KB):  2 to 4
35 memory and feature versions
ARM Cortex-M3 up to 32 MHz
Flash (KB):  4 to 32
RAM (KB):  2 to 4
31 memory and feature versions
ARM Cortex-M3 up to 32 MHz
Flash (KB):  16 to 128
RAM (KB):  8 to 16
60 memory and feature versions
Why is 
EFM32  called 
Gecko?
A gecko’s 
energy 
consumption is 
only 10%  compared 
similar size
ARM Cortex-M3 up to 48 MHz
Flash (KB):  64 to 256
RAM (KB):  32
40 memory and feature versions
ARM Cortex-M3 up to 48 MHz
Flash (KB):  512 and 1024
RAM (KB):  128 to mammals of 
60 memory and and feature versions (Available from: 2012)
ARM Cortex-M4F up to 48 MHz
FPU - Floating Point Unit + DSP instructions
Flash (KB): 64 to 256
RAM (KB): 32
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