Infineon XMC4000 series Application guide

Microcontrollers
XMC4000
Microcontroller Series
for Industrial Applications
Device Guide
V1.0 2013-04
Hibernate
Hibernate Mode Basics
Hibernate Mode Implementations
Control of External Voltage Regulator
Getting Started
Application Hints

Edition 2013-04
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2013 Infineon Technologies AG
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Hibernate
XMC4000 Family
Revision History
Revision History
Page or Item
Subjects (major changes since previous revision)
V1.0, 2013.04
Release
Trademarks of Infineon Technologies AG
AURIX™, C166™, CanPAK™, CIPOS™, CIPURSE™, EconoPACK™, CoolMOS™, CoolSET™,
CORECONTROL™, CROSSAVE™, DAVE™, EasyPIM™, EconoBRIDGE™, EconoDUAL™,
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PrimePACK™, PrimeSTACK™, PRO-SIL™, PROFET™, RASIC™, ReverSave™, SatRIC™,
SIEGET™, SINDRION™, SIPMOS™, SmartLEWIS™, SOLID FLASH™, TEMPFET™, thinQ!™,
TRENCHSTOP™, TriCore™.
Other Trademarks
Advance Design System™ (ADS) of Agilent Technologies, AMBA™, ARM™, MULTI-ICE™, KEIL™,
PRIMECELL™, REALVIEW™, THUMB™, µVision™ of ARM Limited, UK. AUTOSAR™ is licensed by
AUTOSAR development partnership. Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT Forum.
COLOSSUS™, FirstGPS™ of Trimble Navigation Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.).
EPCOS™ of Epcos AG. FLEXGO™ of Microsoft Corporation. FlexRay™ is licensed by FlexRay
Consortium. HYPERTERMINAL™ of Hilgraeve Incorporated. IEC™ of Commission Electrotechnique
Internationale. IrDA™ of Infrared Data Association Corporation. ISO™ of INTERNATIONAL
ORGANIZATION FOR STANDARDIZATION. MATLAB™ of MathWorks, Inc. MAXIM™ of Maxim
Integrated Products, Inc. MICROTEC™, NUCLEUS™ of Mentor Graphics Corporation. Mifare™ of
NXP. MIPI™ of MIPI Alliance, Inc. MIPS™ of MIPS Technologies, Inc., USA. muRata™ of MURATA
MANUFACTURING CO., MICROWAVE OFFICE™ (MWO) of Applied Wave Research Inc.,
OmniVision™ of OmniVision Technologies, Inc. Openwave™ Openwave Systems Inc. RED HAT™
Red Hat, Inc. RFMD™ RF Micro Devices, Inc. SIRIUS™ of Sirius Satellite Radio Inc. SOLARIS™ of
Sun Microsystems, Inc. SPANSION™ of Spansion LLC Ltd. Symbian™ of Symbian Software Limited.
TAIYO YUDEN™ of Taiyo Yuden Co. TEAKLITE™ of CEVA, Inc. TEKTRONIX™ of Tektronix Inc.
TOKO™ of TOKO KABUSHIKI KAISHA TA. UNIX™ of X/Open Company Limited. VERILOG™,
PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™ of Texas Instruments Incorporated.
VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™ of Diodes Zetex Limited.
Last Trademarks Update 2011-02-24

Hibernate
XMC4000 Family
Table of Contents
Device Guide 4 V1.0, 2013-04
Table of Contents
1Hibernate Mode Basics......................................................................................................................6
1.1 Externally Controlled Hibernate Use Cases.........................................................................................7
1.2 Internally Controlled Hibernate Use Cases..........................................................................................8
2Hibernate Mode Implementations...................................................................................................11
2.1 Externally Controlled Hibernate Mode Concept.................................................................................11
2.2 Internally Controlled Hibernate Mode Concept..................................................................................13
3Control of External Voltage Regulator...........................................................................................16
3.1 Active high enable via pull-up ............................................................................................................17
3.2 Active high enable driven from a voltage divider ...............................................................................18
3.3 Active low enable driven with push-pull I/O ......................................................................................19
3.4 Active low enable and with pull-up to high.........................................................................................20
3.5 Active low enable driven from a voltage divider.................................................................................20
3.6 Active low enable driven from a voltage divider and VBAT..................................................................21
4Getting Started .................................................................................................................................24
4.1 Initialize Hibernate Domain ................................................................................................................25
4.2 Store Context Data in Retention Memory ..........................................................................................26
4.3 Select Wake-up Triggers....................................................................................................................27
4.4 Configure Hibernate Control I/O.........................................................................................................28
4.5 Request External Hibernate Mode.....................................................................................................29
4.6 Request Internal Hibernate Mode ......................................................................................................29
4.7 Hibernate Mode Entered....................................................................................................................30
4.8 Wake-up Trigger Detected.................................................................................................................30
4.9 Power-up and Boot-up .......................................................................................................................31
4.10 Processing of Wake-up Cause Info....................................................................................................31
4.11 Clear Reset Status.............................................................................................................................32
4.12 Restore Context Data from Retention Memory..................................................................................32
4.13 Execute Application Code..................................................................................................................32
5Application Hints..............................................................................................................................35
5.1 Which Hibernate Mode to Choose.....................................................................................................35
5.2 Hibernate Domain Clock ....................................................................................................................35
5.3 Digital I/O Voltage Levels...................................................................................................................36
5.4 Analog I/O Voltage Levels..................................................................................................................36
5.5Retention Memory..............................................................................................................................36
5.6 Emergency Recovery from Hibernate Mode......................................................................................37

Hibernate
XMC4000 Family
Hibernate Mode Basics
Device Guide 5 V1.0, 2013-04
Hibernate Mode Basics

Hibernate
XMC4000 Family
Hibernate Mode Basics
Device Guide 6 V1.0, 2013-04
1 Hibernate Mode Basics
Hibernate Mode is one of the system power states of the XMC4000 device. The XMC4000 devices
implements Power Management control that aims at reduction of power consumption. The available
Power Modes (also referred to as Power States) of the system, depicted in Figure 1., offer different
features they may be utilized in an application specific manner, with the focus on different aspects,
like current consumption, transition time between states, system topology, etc.
Figure 1 System Power States
The XMC family implements the following Power Modes:
Active Mode - the normal operation state.
−Entered automatically after system reset release
Sleep Mode - clock of the CPU and selected peripherals is stopped.
−Entered via WFI or WFE instruction of the CPU (for details please refer to Cortex-M4
documentation)
−Wake-up on any valid interrupt/exception
Deep Sleep Mode –similar to Sleep Mode, with an ability to power down additional peripherals
−Entered via WFI or WFE instruction of the CPU (for details please refer to Cortex-M4
documentation)
−Wake-up on any valid interrupt/exception
Hibernate Mode –Power Supply to the chip or to the core (on some family XMC4000 family
members) is switched off and only Hibernate Domain remain powered on
The Hibernate Mode is the power mode of the lowest power consumption, offering Real Time Clock
keeping and preservation of a context specific data in a retention memory (for details on power
consumption and timing figures please refer to Data Sheet). Transitions into and from the power
states are controlled with user software and valid wake-up events respectively. The wake-up trigger
events may be generated by different sources, like external signals or RTC events, configured by the
user prior to entering a power saving state.
There are two implementations of the Hibernate Mode Control.
Externally Controlled Hibernate Mode (ECHM) with an IO actively controlling External Voltage
Regulator

Hibernate
XMC4000 Family
Hibernate Mode Basics
Device Guide 7 V1.0, 2013-04
Internally Controlled Hibernate Mode (ICHM) with an internal signal actively controlling Embedded
Voltage Regulator (EVR)
1.1 Externally Controlled Hibernate Use Cases
Generic application scenarios of Externally Controlled Hibernate Mode are illustrated in Figure 2.
These use case scenarios enable the XMC4000 to act as a system Power Control Master. All system
components supplied with VDDP are powered off and no current is drawn in the VDDP power
domain. Upon a wake-up trigger complete VDDP power domain of the system on PCB will be brought
into operation.
Figure 2 Examples of Externally Controlled Hibernate Mode use case
The external hibernate control is performed via the Hibernate Control Signal that will switch off the
Voltage Regulator providing VDDP voltage to all components of the board. VBAT will still be supplied
from an auxiliary source like e.g. a coin battery, or, a capacitor while in the Externally Controlled

Hibernate
XMC4000 Family
Hibernate Mode Basics
Device Guide 8 V1.0, 2013-04
Hibernate Mode. A wake-up trigger will come from an external source and/or from the internal RTC
module.
1.2 Internally Controlled Hibernate Use Cases
Generic application scenarios of Internally Controlled Hibernate Mode are illustrated in Figure 3.
These use case scenarios enable the XMC4000 to act as a system Power Control Slave. All system
components in the VDDP power remain powered on while Core Domain of the XMC4000 device is
powered off and I/Os are reset to input operation mode. Upon a wake-up trigger Core Domain of the
XMC4000 will be powered-up and brought into operation.
Figure 3 Examples of Internally Controlled Hibernate Mode use case
The internal hibernate control is performed via an internal circuit inside of the XMC4000 that will
switch off the Embedded Voltage Regulator providing VDDC voltage to the Core Domain of the chip.
While in Internally Controlled Hibernate Mode VBAT may still be supplied directly from the VDDP
source while main supply is available, and/or from an auxiliary source like e.g. a coin battery, or, a

Hibernate
XMC4000 Family
Hibernate Mode Basics
Device Guide 9 V1.0, 2013-04
capacitor when the mains supply if off. A wake-up trigger will come from an external source and/or
from the internal RTC module and will enable Core Domain voltage generation (if VDDP is still
available).
Note:The Internally Controlled Hibernate Mode is not supported on XMC4500 device.

Hibernate
XMC4000 Family
Hibernate Mode Basics
Device Guide 10 V1.0, 2013-04
Hibernate Mode
Implementations