Silicon Laboratories EFM32JG1 User manual

EFM32 Jade Gecko Family

EFM32JG1 Reference Manual

The EFM32 Jade Gecko MCUs are the world’s most energy-

friendly microcontrollers.

EFM32JG1 features a powerful 32-bit ARM® Cortex-M3 and a wide selection of periph-

erals, including a unique cryptographic hardware engine supporting AES, ECC, and

SHA. These features, combined with ultra-low current active mode and short wake-up

time from energy-saving modes, make EFM32JG1 microcontrollers well suited for any

battery-powered application, as well as other systems requiring high performance and

low-energy consumption.

Example applications:

ENERGY FRIENDLY FEATURES

• ARM Cortex-M3 at 40 MHz

• Ultra low energy operation:

• 2.1 μA EM3 Stop current (CRYOTIMER

running with state/RAM retention)

• 2.5 μA EM2 DeepSleep current (RTCC

running with state and RAM retention)

• 63 μA/MHz in Energy Mode 0 (EM0)

• Hardware cryptographic engine supports

AES, ECC, and SHA

• Integrated dc-dc converter

• CRYOTIMER operates down to EM4

• 5 V tolerant I/O

• IoT devices and sensors

• Health and fitness

• Smart accessories

• Home automation and security

• Industrial and factory automation

Peripheral Reflex System

32-bit bus

Core / Memory

Lowest power mode with peripheral operational:

EM2 – Deep Sleep

EM1 - Sleep EM4 - Hibernate EM4 - Shutoff

EM0 - Active EM3 - Stop

Serial Interfaces

USART

Low Energy UARTTM

I2C

I/O Ports Timers and Triggers

CRYOTIMER

Real Time Counter

and Calendar

Other

CRYPTO

CRC

Analog Interfaces

ADC

IDAC

Analog Comparator

Timer/Counter Low Energy Timer

Pulse Counter

Watchdog Timer

External Interrupts

General Purpose I/O

Pin Reset

Pin Wakeup

Flash Program

Memory RAM Memory

ARM CortexTM M3 processor

Debug Interface DMA Controller

Energy Management

Brown-Out

Detector

DC-DC

Converter

Voltage

Regulator Voltage Monitor

Power-On Reset

Clock Management

Low Frequency

Crystal

Oscillator

High Frequency

RC Oscillator

Ultra Low

Frequency RC

Oscillator

Auxiliary High

Frequency RC

Oscillator

Memory

Protection Unit

High Frequency

Crystal

Oscillator

Low Frequency

RC Oscillator

silabs.com | Smart. Connected. Energy-friendly. Preliminary Rev. 0.6

This information applies to a product under development. Its characteristics and specifications are subject to change without notice.

1. About This Document

1.1 Introduction

This document contains reference material for the EFM32 Jade Gecko devices. All modules and peripherals in the EFM32 Jade Gecko

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 pinout, are covered in the device data sheets.

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1.2 Conventions

TIMERn_CTRL - Control Register

The "n" denotes the module number for modules which can exist in 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

The "x" denotes the different ports.

Bit Fields

Registers contain one or more bit fields which can be 1 to 32 bits wide. Bit fields wider than 1 bit are given with start (x) and stop (y) bit

[y:x].

Bit fields containing more than one bit are unsigned integers unless otherwise is specified.

Unspecified bit field settings must not be used, as this may lead to unpredictable behaviour.

Address

The address for each register can be found by adding the base address of the module found in the Memory Map (see Figure 4.2 Sys-

tem Address Space with Core and Code Space Listing on page 15), 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 1.1 Register Access Types on page 2.

Table 1.1. 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

(R)W1 Sometimes readable. Only writes to 1 have effect. Currently only

used for IFC registers (see 3.3.1.2 IFC Read-clear Operation)

W1 Read value undefined. Only writes to 1 have effect

W Write only. Read value undefined.

RWH Readable, writable, and updated by hardware

RW(nB), RWH(nB), etc. "(nB)" suffix indicates that register explicitly does not support pe-

ripheral bit set or clear (see 4.2.2 Peripheral Bit Set and Clear)

RW(a), R(a), etc. "(a)" suffix indicates that register has actionable reads (see

5.3.6 Debugger reads of actionable registers)

Number format

0x prefix is used for hexadecimal numbers

0b prefix is used for binary numbers

Numbers without prefix are in decimal representation.

Reserved

Registers and bit fields marked with reserved are reserved for future use. These should be written to 0 unless otherwise stated in the

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Reset Value

The reset value denotes the value after reset.

Registers denoted with X have unknown value out of reset and need to be initialized before use. Note that read-modify-write operations

on these registers before they are initialized results in undefined register values.

Pin Connections

Pin connections are given with a module prefix followed by a short pin name:

CMU_CLKOUT1 (Clock management unit, clock output pin number 1)

The location for the pin names given in the module documentation can be found in the device-specific datasheet.

1.3 Related Documentation

Further documentation on the EFM32 Jade Gecko devices and the ARM Cortex-M3 can be found at the Silicon Labs and ARM web

pages:

www.silabs.com

www.arm.com

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2. System Overview

0 1 2 3 4

Quick Facts

What?

The EFM32 Jade Gecko is a highly integrated, con-

figurable and low power MCU with a complete set of

peripherals.

Why?

EFM32 Jade Gecko features an Cortex-M3 core, a

unique cryptographic hardware engine supporting

AES, ECC, and SHA, ultra-low current active mode,

and short wake-up time from energy-saving modes.

How?

EFM32 Jade Gecko microcontrollers are well suited

for any batter-powered application, as well as other

systems requiring high performance and low-energy

consumption

2.1 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 EFM32

Jade Gecko microcontroller is well suited for any battery operated application as well as other systems requiring high performance and

low-energy consumption.

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2.2 Block Diagrams

The block diagram for the EFM32 Jade Gecko MCU series is shown in (Figure 2.1 EFM32 Jade Gecko System-On-Chip Block Diagram

on page 5).

Peripheral Reflex System

32-bit bus

Core / Memory

Lowest power mode with peripheral operational:

EM2 – Deep Sleep

EM1 - Sleep EM4 - Hibernate EM4 - Shutoff

EM0 - Active EM3 - Stop

Serial Interfaces

USART

Low Energy UARTTM

I2C

I/O Ports Timers and Triggers

CRYOTIMER

Real Time Counter

and Calendar

Other

CRYPTO

CRC

Analog Interfaces

ADC

IDAC

Analog Comparator

Timer/Counter Low Energy Timer

Pulse Counter

Watchdog Timer

External Interrupts

General Purpose I/O

Pin Reset

Pin Wakeup

Flash Program

Memory RAM Memory

ARM CortexTM M3 processor

Debug Interface DMA Controller

Energy Management

Brown-Out

Detector

DC-DC

Converter

Voltage

Regulator Voltage Monitor

Power-On Reset

Clock Management

Low Frequency

Crystal

Oscillator

High Frequency

RC Oscillator

Ultra Low

Frequency RC

Oscillator

Auxiliary High

Frequency RC

Oscillator

Memory

Protection Unit

High Frequency

Crystal

Oscillator

Low Frequency

RC Oscillator

Figure 2.1. EFM32 Jade Gecko System-On-Chip Block Diagram

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2.3 MCU Features overview

•ARM Cortex-M3 CPU platform

• High Performance 32-bit processor @ up to 40 MHz

• Memory Protection Unit

• Wake-up Interrupt Controller

•Flexible Energy Management System

• Power routing configurations including DCDC control

• Voltage Monitoring and Brown Out Detection

• State Retention

•256 KB Flash

•32 KB RAM

•Up to 32 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

•12 Channel Peripheral Reflex System

• Autonomous inter-peripheral signaling enables smart operation in low energy modes

•CRYPTO Advanced Encryption Standard Accelerator

• AES encryption / decryption, with 128 or 256 bit keys

• Multiple AES modes of operation, including Counter (CTR), Galois/Counter Mode (GCM), Cipher Block Chaining (CBC), Cipher

Feedback (CFB) and Output Feedback (OFB).

• Accelerated SHA-1 and SHA-2

• Accelerated Elliptic Curve Cryptography (ECC), with binary or prime fields

• Flexible 256-bit ALU and sequencer

•General Purpose Cyclic Redundancy Check

• Programmable 16-bit polynomial, fixed 32-bit polynomial

•Communication interfaces

• 2×Universal Synchronous/Asynchronous Receiver/Transmitter

• UART/SPI/SmartCard (ISO 7816)/IrDA/I2S

• Triple buffered full/half-duplex operation

• Hardware flow control

• 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 or 4 Compare/Capture/PWM channels

• Dead-Time Insertion on TIMER0

• 16-bit Low Energy Timer

• 32-bit Ultra Low Energy Timer/Counter (CRYOTIMER) for periodic wake-up from any Energy Mode

• 32-bit Real-Time Counter and Calendar

• 16+16+32 bit Protocol Timer

• 16-bit Pulse Counter

• 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

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• Single ended or differential operation

• Conversion tailgating for predictable latency

• Current Digital to Analog Converter

• Source or sink a configurable constant current

• 2× Analog Comparator

• Programmable speed/current

• Capacitive sensing with up to 8 inputs

• Analog Port

•Ultra efficient Power-on Reset and Brown-Out Detector

•Debug Interface

• 4-pin Joint Test Action Group (JTAG) interface

• 2-pin serial-wire debug (SWD) interface

2.4 Oscillators and Clocks

EFM32 Jade Gecko has six different oscillators integrated, as shown in Table 2.1 EFM32 Jade Gecko Oscillators on page 7

Table 2.1. EFM32 Jade Gecko Oscillators

Oscillator Frequency Optional? External

components

Description

HFXO 38 MHz - 40 MHz No Crystal High accuracy, low jitter high frequency crystal oscillator. Tun-

able crystal loading capacitors are fully integrated.

HFRCO 1 MHz - 38 MHz No - Medium accuracy RC oscillator, typically used for timing dur-

ing startup of the HFXO or if a precise oscillator is not re-

quired.

AUXHFRCO 1 MHz - 38 MHz No - Medium accuracy RC oscillator, typically used as alternative

clock source for Analog to Digital Converter or Debug Trace.

LFRCO 32768 Hz No - Medium accuracy frequency reference typically used for medi-

um accuracy RTCC timing.

LFXO 32768 Hz Yes Crystal High accuracy frequency reference typically used for high ac-

curacy RTCC timing. Tunable crystal loading capacitors are

fully integrated.

ULFRCO 1000 Hz No - Ultra low frequency oscillator typically used for the watchdog

timer.

The RC oscillators can be calibrated against either of the crystal oscillators in order to compensate for temperature and voltage supply

variations. Hardware support is included to measure the frequency of various oscillators against each other.

Oscillator and clock management is available through the Clock Management Unit (CMU), see section 10. CMU - Clock Management

Unit for details.

2.5 Hardware CRC Support

EFM32 Jade Gecko supports a configurable CRC generation:

• 8, 16, 24 or 32 bit CRC value

• Configurable polynomial and initialization value

• Optional inversion of CRC value over air

• Configurable CRC byte ordering

• Support for multiple CRC values calculated and verified per transmitted or received frame

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2.6 Data Encryption and Authentication

EFM32 Jade Gecko has hardware support for AES encryption, decryption and authentication modes. These security operations can be

performed on data in RAM or any data buffer, without further CPU intervention. The key size is 128 bits.

AES modes of operations directly supported by the EFM32 Jade Gecko hardware are listed in Table 2.2 AES modes of operation with

hardware support on page 8. In addition to these modes, other modes can also be implemented by using combinations of modes.

For example, the CCM mode can be implemented using the CTR and CBC-MAC modes in combination.

Table 2.2. AES modes of operation with hardware support

AES Mode Encryption / Decryption Authentication Comment

ECB Yes - Electronic Code Book

CTR Yes - Counter mode

CCM Yes Yes Counter with CBC-MAC

CCM* Yes Yes CCM with encryption-only and

integrity-only capabilities

GCM Yes Yes Galois Counter Mode

CBC Yes - Cipher Block Chaining

CBC-MAC - Yes Cipher Block Chaining, Mes-

sage Authentication Code

CMAC - Yes Cipher-basec MAC

CFB Yes - Cipher Feedback

OFB Yes - Output Feedback

The CRYPTO module can provide data directly from the embedded Cortex-M3 or via DMA.

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2.7 Timers

EFM32 Jade Gecko includes multiple timers, as can be seen from Table 2.3 EFM32 Jade Gecko Timers Overview on page 9.

Table 2.3. EFM32 Jade Gecko Timers Overview

Timer Number of instances Typical clock source Overview

RTCC 1 Low frequency (LFXO or

LFRCO)

32 bit Real Time Counter and

Calendar, typically used to ac-

curately time inactive periods

and enable wakeup on compare

match.

TIMER 2 High frequency (HFXO or

HFRCO)

16 bit general purpose timer.

Systick timer 1 High frequency (HFXO or

HFRCO)

32 bit systick timer integrated in

the Cortex-M3. Typically used

as an Operating System timer.

WDOG 1 Low frequency (LFXO, LFRCO

or ULFRCO)

Watch dog timer. Once enabled,

this module must be periodically

accessed. If not, this is consid-

ered an error and the EFM32

Jade Gecko is reset in order to

recover the system.

LETIMER 1 Low frequency (LFXO, LFRCO

or ULFRCO)

Low energy general purpose

timer.

Advanced interconnect features allows synchronization between timers. This includes:

• Start / stop any high frequency timer synchronized with the RTCC

• Trigger RSM state transitions based on compare timer compare match, for instance to provide clock cycle accuracy on frame trans-

mit timing

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