Silicon Laboratories EFM32TG User manual

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EFM32TG Reference Manual
Tiny Gecko Series
• 32-bit ARM Cortex-M3 processor running at up to 32 MHz
• Up to 32 kB Flash and 4 kB RAM memory
• Energy efficient and autonomous peripherals
• Ultra low power Energy Modes with sub-µA operation
• Fast wake-up time of only 2 µs
The EFM32TG 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. EFM32TG devices consume as little as 150 µA/MHz in run
mode, and as little as 1.0 µA with a Real Time Counter running, Brown-out and full
RAM and register retention.
EFM32TG's low energy consumption outperforms any other available 8-, 16-,
and 32-bit solution. The EFM32TG 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.

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1 Energy Friendly Microcontrollers
1.1 Typical Applications
The EFM32TG Tiny 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
powerandtheactivetime,overallphasesofMCUoperation.Thisuniquecombinationofultralowenergy
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 EFM32TG microcontrollers are perfect for:
• Gas metering
• Energy metering
• Water metering
• Smart metering
• Alarm and security systems
• Health and fitness applications
• Industrial and home automation
01 2 3 4
1.2 EFM32TG Development
Because EFM32TG 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 EFM32TG devices ensure easy migration and feature upgrade possibilities.

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2 About This Document
This document contains reference material for the EFM32TG series of microcontrollers. All modules and
peripherals in the EFM32TG 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 xdenotes 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 xis the start bit and yis 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 Description
R Read only. Writes are ignored.
RW Readable and writable.
RW1 Readable and writable. Only writes to 1 have effect.
RW1H Readable, writable and updated by hardware. Only writes to
1 have effect.
W1 Read value undefined. Only writes to 1 have effect.
W Write only. Read value undefined.
RWH 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 EFM32TG 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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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 EFM32TG 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
•ARM Cortex-M3 CPU platform
• High Performance 32-bit processor @ up to 32 MHz
• Wake-up Interrupt Controller
•Flexible Energy Management System
• 20 nA @ 3 V Shutoff Mode
• 0.6 µA @ 3 V Stop Mode, including Power-on Reset, Brown-out Detector, RAM and CPU
retention
• 1.0 µA @ 3 V Deep Sleep Mode, including RTC with 32.768 kHz oscillator, Power-on
Reset, Brown-out Detector, RAM and CPU retention
• 51 µA/MHz @ 3 V Sleep Mode
• 150 µA/MHz @ 3 V Run Mode, with code executed from flash
•32/16/8/4 KB Flash
•4/2 KB RAM
•Up to 56 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
•8 Channel DMA Controller
• Alternate/primary descriptors with scatter-gather/ping-pong operation
•8 Channel Peripheral Reflex System
• Autonomous inter-peripheral signaling enables smart operation in low energy modes
•Integrated LCD Controller for up to 8×20 Segments
• Voltage boost, adjustable contrast adjustment and autonomous animation feature
•Hardware AES with 128/256-bit Keys in 54/75 cycles
•Communication interfaces
• 2× Universal Synchronous/Asynchronous Receiver/Transmitter
• SPI/SmartCard (ISO 7816)/IrDA (USART0)/I2S (USART1)
• Triple buffered full/half-duplex operation
• 4-16 data bits
• 1× Low Energy UART
• Autonomous operation with DMA in Deep Sleep Mode
• 1× I2C Interface with SMBus support
• Address recognition in Stop Mode
•Timers/Counters
• 2× 16-bit Timer/Counter
• 3 Compare/Capture/PWM channels
• 16-bit Low Energy Timer
• 24-bit Real-Time Counter
• 1× 16-bit Pulse Counter

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• Asynchronous pulse counting/quadrature decoding
• Watchdog Timer with dedicated RC oscillator @ 50 nA
•Ultra low power precision analog peripherals
• 12-bit 1 Msamples/s Analog to Digital Converter
• 8 input channels and on-chip temperature sensor
• Single ended or differential operation
• Conversion tailgating for predictable latency
• 12-bit 500 ksamples/s Digital to Analog Converter
• 2 single ended channels/1 differential channel
• Up to 3 Operational Amplifiers
• Supports rail-to-rail inputs and outputs
• Programmable gain
• 2× Analog Comparator
• Programmable speed/current
• Capacitive sensing with up to 8 inputs
• Supply Voltage Comparator
•Ultra low power sensor interface
• Autonomous sensor monitoring in Deep Sleep Mode
• Wide range of sensors supported, including LC sensors and capacitive buttons
•Ultra efficient Power-on Reset and Brown-Out Detector
•2-pin Serial Wire Debug interface
• 1-pin Serial Wire Viewer
•Temperature range -40 - 85°C
•Single power supply 1.98 - 3.8 V
•Packages
• QFN24
• QFN32
• QFN64
• TQFP48
• TQFP64
3.3 Block Diagram
Figure 3.1 (p. 7) shows the block diagram of EFM32TG. The color indicates peripheral availability
in the different energy modes, described in Section 3.4 (p. 7) .

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Figure 3.1. Block Diagram of EFM32TG
Clock Management Energy Management
Serial Interfaces
I/O Ports
Core andMemory
Timers/ Triggers Analog Interfaces Security
32-bit bus
Peripheral Reflex System
ARM Cortex- M3 processor
Flash
Memory
LESENSE
High Frequency
RC
Oscillator
High Frequency
Crystal
Oscillator
Timer/
Counter
Low Energy
Timer
Pulse
Counter
Real Time
Counter
Low Frequency
Crystal
Oscillator
Low Frequency
RC
Oscillator
LCD
Controller
Voltage
Regulator
Watchdog
Timer
RAM
Memory
Voltage
Comparator
Power-on
Reset Brown-out Detector
General
Purpose
I/ O
Low
Energy
UART
Watchdog
Oscillator
ADC
DAC
DMA
Controller
Debug
Interface
External
Interrupts
Pin
Reset
USART
I
2
C
AES
Tiny Gecko
Operational
Amplifier
Analog
Comparator
Figure 3.2. Energy Mode Indicator
01 2 3 4
Note In the energy mode indicator, the numbers indicates Energy Mode, i.e EM0-EM4.
3.4 Energy Modes
There are five different Energy Modes (EM0-EM4) in the EFM32TG, see Table 3.1 (p. 8). The
EFM32TG 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 time, 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 showing which energy mode(s) the module can operate (see Table 3.1 (p. 8) ).

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Table 3.1. Energy Mode Description
Energy Mode Name Description
01 2 3 4 EM0 – Energy Mode 0
(Run mode)
In EM0, the CPU is running and consuming as little as 150 µA/MHz, when
running code from flash. All peripherals can be active.
01 2 3 4 EM1 – Energy Mode 1
(Sleep Mode) In EM1, the CPU is sleeping and the power consumption is only 51 µA/MHz. All peripherals, including DMA, PRS and memory system, are still available.
01 2 3 4 EM2 – Energy Mode 2
(Deep Sleep Mode)
In EM2 the high frequency oscillator is turned off, but with the 32.768 kHz
oscillator running, selected low energy peripherals (LCD, RTC, LETIMER,
PCNT, LEUART, I2C, LESENSE, OPAMP, WDOG and ACMP) are still
available. This gives a high degree of autonomous operation with a current
consumption as low as 1.0 µA with RTC enabled. Power-on Reset, Brown-out
Detection and full RAM and CPU retention is also included.
01 2 3 4 EM3 - Energy Mode 3
(Stop Mode)
In EM3, the low-frequency oscillator is disabled, but there is still full CPU
and RAM retention, as well as Power-on Reset, Pin reset, EM4 wake-up
and Brown-out Detection, with a consumption of only 0.6 µA. The low-power
ACMP, asynchronous external interrupt, PCNT, and I2C can wake-up the
device. Even in this mode, the wake-up time is a few microseconds.
01 2 3 4 EM4 – Energy Mode 4
(Shutoff Mode)
In EM4, the current is down to 20 nA and all chip functionality is turned off
except the pin reset, GPIO pin wake-up, GPIO pin retention and the Power-
On Reset. All pins are put into their reset state.
3.5 Product Overview
Table 3.2 (p. 8) shows a device overview of the EFM32TG Microcontroller Series, including
peripheral functionality. For more information, the reader is referred to the device specific datasheets.
Table 3.2. EFM32TG Microcontroller Series
EFM32TG Part # Flash RAM GPIO(pins) LCD USART LEUART I2C Timer(PWM) LETIMER RTC PCNT Watchdog ADC(pins) DAC(pins) ACMP(pins) AES EBI LESENSE Op-Amps Package
108F4 4 1 17 - 1 1 1 2
(6) 1 1 1 1 - - 2 (4) - - Y - QFN24
108F8 8 2 17 - 1 1 1 2
(6) 1 1 1 1 - - 2 (4) - - Y - QFN24
108F16 16 4 17 - 1 1 1 2
(6) 1 1 1 1 - - 2 (4) - - Y - QFN24
108F32 32 4 17 - 1 1 1 2
(6) 1 1 1 1 - - 2 (4) - - Y - QFN24

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EFM32TG Part # Flash RAM GPIO(pins) LCD USART LEUART I2C Timer(PWM) LETIMER RTC PCNT Watchdog ADC(pins) DAC(pins) ACMP(pins) AES EBI LESENSE Op-Amps Package
110F4 4 1 17 - 1 1 1 2
(6) 1 1 1 1 1 (2) 2 (1) 2 (4) Y - Y 3 QFN24
110F8 8 2 17 - 1 1 1 2
(6) 1 1 1 1 1 (2) 2 (1) 2 (4) Y - Y 3 QFN24
110F16 16 4 17 - 1 1 1 2
(6) 1 1 1 1 1 (2) 2 (1) 2 (4) Y - Y 3 QFN24
110F32 32 4 17 - 1 1 1 2
(6) 1 1 1 1 1 (2) 2 (1) 2 (4) Y - Y 3 QFN24
210F8 8 2 24 - 2 1 1 2
(6) 1 1 1 1 1 (4) 2 (1) 2 (5) Y - Y 3 QFN32
210F16 16 4 24 - 2 1 1 2
(6) 1 1 1 1 1 (4) 2 (1) 2 (5) Y - Y 3 QFN32
210F32 32 4 24 - 2 1 1 2
(6) 1 1 1 1 1 (4) 2 (1) 2 (5) Y - Y 3 QFN32
222F8 8 2 37 - 2 1 1 2
(6) 1 1 1 1 1 (4) 2 (1) 2 (12) Y - Y 3 QFP48
222F16 16 4 37 - 2 1 1 2
(6) 1 1 1 1 1 (4) 2 (1) 2 (12) Y - Y 3 QFP48
222F32 32 4 37 - 2 1 1 2
(6) 1 1 1 1 1 (4) 2 (1) 2 (12) Y - Y 3 QFP48
225F8 8 2 37 - 2 1 1 2
(6) 1 1 1 1 1 (4) 2 (1) 2 (12) Y - Y 3 BGA48
225F16 16 4 37 - 2 1 1 2
(6) 1 1 1 1 1 (4) 2 (1) 2 (12) Y - Y 3 BGA48
225F32 32 4 37 - 2 1 1 2
(6) 1 1 1 1 1 (4) 2 (1) 2 (12) Y - Y 3 BGA48
230F8 8 2 56 - 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (16) Y - Y 3 QFN64
230F16 16 4 56 - 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (16) Y - Y 3 QFN64
230F32 32 4 56 - 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (16) Y - Y 3 QFN64
232F8 8 2 53 - 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (16) Y - Y 3 QFP64
232F16 16 4 53 - 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (16) Y - Y 3 QFP64
232F32 32 4 53 - 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (16) Y - Y 3 QFP64
822F8 8 2 37 Y 2 1 1 2
(6) 1 1 1 1 1 (5) 2 (1) 2 (4) Y - Y 3 QFP48
822F16 16 4 37 Y 2 1 1 2
(6) 1 1 1 1 1 (5) 2 (1) 2 (4) Y - Y 3 QFP48
822F32 32 4 37 Y 2 1 1 2
(6) 1 1 1 1 1 (5) 2 (1) 2 (4) Y - Y 3 QFP48
825F8 8 2 37 Y 2 1 1 2
(6) 1 1 1 1 1 (5) 2 (1) 2 (4) Y - Y 3 BGA48
825F16 16 4 37 Y 2 1 1 2
(6) 1 1 1 1 1 (5) 2 (1) 2 (4) Y - Y 3 BGA48
825F32 32 4 37 Y 2 1 1 2
(6) 1 1 1 1 1 (5) 2 (1) 2 (4) Y - Y 3 BGA48
840F8 8 2 56 Y 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (8) Y - Y 3 QFN64
840F16 16 4 56 Y 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (8) Y - Y 3 QFN64

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EFM32TG Part # Flash RAM GPIO(pins) LCD USART LEUART I2C Timer(PWM) LETIMER RTC PCNT Watchdog ADC(pins) DAC(pins) ACMP(pins) AES EBI LESENSE Op-Amps Package
840F32 32 4 56 Y 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (8) Y - Y 3 QFN64
842F8 8 2 53 Y 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (8) Y - Y 3 QFP64
842F16 16 4 53 Y 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (8) Y - Y 3 QFP64
842F32 32 4 53 Y 2 1 1 2
(6) 1 1 1 1 1 (8) 2 (2) 2 (8) Y - Y 3 QFP64
3.6 Device Revision
The device revision number is read from the ROM Table. The major revision number and the chip family
number is read from PID0 and PID1 registers. The minor revision number is extracted from the PID2 and
PID3 registers, as illustrated in Figure 3.3 (p. 10). The Fam[5:2] and Fam[1:0] must be combined
to complete the chip family number, while the Minor Rev[7:4] and Minor Rev[3:0] must be combined to
form the complete revision number.
Figure 3.3. Revision Number Extraction
PID1 (0xE00FFFE4)
31:4 3:0
PID0 (0xE00FFFE0)
31:7 6:5 5:0
Major Rev[5:0]
PID3 (0xE00FFFEC)
31:8 7:4 3:0
Minor Rev[3:0]
Fam[1:0] Fam[5:2]
PID2 (0xE00FFFE8)
31:8 7:4 3:0
Minor Rev[7:4]
For the latest revision of the Tiny Gecko family, the chip family number is 0x01 and the major revision
number is 0x01. The minor revision number is to be interpreted according to Table 3.3 (p. 10) .
Table 3.3. Minor Revision Number Interpretation
Minor Rev[7:0] Revision
0x00 A
0x01 B
0x02 C