...the world's most energy friendly microcontrollers
EFM32LG Reference Manual
Leopard Gecko Series
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32-bit ARM Cortex-M3 processor running at up to 48 MHz
Up to 256 kB Flash and 32 kB RAM memory
Energy efficient and autonomous peripherals
Ultra low power Energy Modes with Sub µ operation
Fast wake-up time of only 2 µs
The EFM32LG microcontroller series revolutionizes the 8- to 32-bit market with a
combination of unmatched performance and ultra low power consumption in both
active- and sleep modes. EFM32LG devices consume as little as 211 µA/MHz in run
mode.
EFM32LG's low energy consumption outperforms any other available 8-, 16-,
and 32-bit solution. The EFM32LG includes autonomous and energy efficient
peripherals, high overall chip- and analog integration, and the performance of the
industry standard 32-bit ARM Cortex-M3 processor.
...the world's most energy friendly microcontrollers
1 Energy Friendly Microcontrollers
1.1 Typical Applications
The EFM32LG Leopard Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive
applications. These devices are developed to minimize the energy consumption by lowering both the
power and the active time, over all phases of MCU operation. This unique combination of ultra low energy
consumption and the performance of the 32-bit ARM Cortex-M3 processor, help designers get more out
of the available energy in a variety of applications.
Ultra low energy EFM32LG microcontrollers are perfect for:
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Gas metering
Energy metering
Water metering
Smart metering
Alarm and security systems
Health and fitness applications
Industrial and home automation
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1.2 EFM32LG Development
Because EFM32LG use the Cortex-M3 CPU, embedded designers benefit from the largest development
ecosystem in the industry, the ARM ecosystem. The development suite spans the whole design
process and includes powerful debug tools, and some of the world’s top brand compilers. Libraries with
documentation and user examples shorten time from idea to market.
The range of EFM32LG devices ensure easy migration and feature upgrade possibilities.
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...the world's most energy friendly microcontrollers
2 About This Document
This document contains reference material for the EFM32LG series of microcontrollers. All modules and
peripherals in the EFM32LG series devices are described in general terms. Not all modules are present
in all devices, and the feature set for each device might vary. Such differences, including pin-out, are
covered in the device-specific datasheets.
2.1 Conventions
Register Names
Register names are given as a module name prefix followed by the short register name:
TIMERn_CTRL - Control Register
The "n" denotes the numeric instance for modules that might have more than one instance.
Some registers are grouped which leads to a group name following the module prefix:
GPIO_Px_DOUT - Port Data Out Register,
where
x
denotes the port instance (A,B,...).
Bit Fields
Registers contain one or more bit fields which can be 1 to 32 bits wide. Multi-bit fields are denoted with
(x:y), where
x
is the start bit and
y
is the end bit.
Address
The address for each register can be found by adding the base address of the module (found in the
Memory Map), and the offset address for the register (found in module Register Map).
Access Type
The register access types used in the register descriptions are explained in Table 2.1 (p. 3) .
Table 2.1. Register Access Types
Access Type
R
RW
RW1
RW1H
W1
W
RWH
Description
Read only. Writes are ignored.
Readable and writable.
Readable and writable. Only writes to 1 have effect.
Readable, writable and updated by hardware. Only writes to
1 have effect.
Read value undefined. Only writes to 1 have effect.
Write only. Read value undefined.
Readable, writable and updated by hardware.
Number format
0x
prefix is used for hexadecimal numbers.
0b
prefix is used for binary numbers.
Numbers without prefix are in decimal representation.
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Reserved
Registers and bit fields marked with
reserved
are reserved for future use. These should be written to 0
unless otherwise stated in the Register Description. Reserved bits might be read as 1 in future devices.
Reset Value
The reset value denotes the value after reset.
Registers denoted with X have an unknown reset value and need to be initialized before use. Note
that, before these registers are initialized, read-modify-write operations might result in undefined register
values.
Pin Connections
Pin connections are given as a module prefix followed by a short pin name:
USn_TX (USARTn TX pin)
The pin locations referenced in this document are given in the device-specific datasheet.
2.2 Related Documentation
Further documentation on the EFM32LG family and the ARM Cortex-M3 can be found at the Silicon
Laboratories and ARM web pages:
www.silabs.com
www.arm.com
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...the world's most energy friendly microcontrollers
3 System Overview
3.1 Introduction
The EFM32 MCUs are the world’s most energy friendly microcontrollers. With a unique combination of
the powerful 32-bit ARM Cortex-M3, innovative low energy techniques, short wake-up time from energy
saving modes, and a wide selection of peripherals, the EFM32LG microcontroller is well suited for
any battery operated application, as well as other systems requiring high performance and low-energy
consumption, see Figure 3.1 (p. 7) .
3.2 Features
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ARM Cortex-M3 CPU platform
• High Performance 32-bit processor @ up to 48 MHz
• Memory Protection Unit
• Wake-up Interrupt Controller
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Flexible Energy Management System
• 20 nA @ 3 V Shutoff Mode
• 0.4 µA @ 3 V Shutoff Mode with RTC
• 0.65 µA @ 3 V Stop Mode, including Power-on Reset, Brown-out Detector, RAM and CPU
retention
• 0.95 µA @ 3 V Deep Sleep Mode, including RTC with 32.768 kHz oscillator, Power-on
Reset, Brown-out Detector, RAM and CPU retention
• 63 µA/MHz @ 3 V Sleep Mode
• 211 µA/MHz @ 3 V Run Mode, with code executed from flash
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256/128/64 KB Flash
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32 KB RAM
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Up to 90 General Purpose I/O pins
• Configurable push-pull, open-drain, pull-up/down, input filter, drive strength
• Configurable peripheral I/O locations
• 16 asynchronous external interrupts
• Output state retention and wake-up from Shutoff Mode
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12 Channel DMA Controller
• Alternate/primary descriptors with scatter-gather/ping-pong operation
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12 Channel Peripheral Reflex System
• Autonomous inter-peripheral signaling enables smart operation in low energy modes
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External Bus Interface (EBI)
• Up to 4×256 MB of external memory mapped space
• TFT Controller supporting Direct Drive
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Universal Serial Bus (USB) with Host and OTG support
• Fully USB 2.0 compliant
• On-chip PHY and embedded 5V to 3.3V regulator
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Integrated LCD Controller for up to 8×36 Segments
• Voltage boost, adjustable contrast adjustment and autonomous animation feature
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Hardware AES with 128/256-bit Keys in 54/75 cycles
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Communication interfaces
• 3× Universal Synchronous/Asynchronous Receiver/Transmitter
• UART/SPI/SmartCard (ISO 7816)/IrDA (USART0)/I2S (USART1+USART2)
• Triple buffered full/half-duplex operation
• 4-16 data bits
• 2× Universal Asynchronous Receiver/Transmitter
• Triple buffered full/half-duplex operation
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