Infineon XMC4000 series User manual

Microcontroller
XMC4000
XMC4000 Family
User Guide
Device Guide
<Revision 1.0>, <2012-30-03>
Preliminary
CCU8 and Capture Mode Features
Advanced Signal Measurement

Edition <2012-30-03>
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2012 Infineon Technologies AG
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Device Guide XMC4000
Advanced Signal Measurement
Confidential
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Last Trademarks Update 2011-02-24

Device Guide XMC4000
Advanced Signal Measurement
Confidential Table of Contents
User Guide 4 <Revision 1.0>, <2012-30-03>
Device Guide
Table of Contents
1Advanced Signal Measurement........................................................................................................6
1.1 Slice Timer Setup in Capture Mode.....................................................................................................6
1.2 The Capture Algorithm.........................................................................................................................7
1.2.1 Disabling the Full-Flags........................................................................................................................7
1.3 Capture by External Events Control.....................................................................................................7
1.3.1 Timer Inputs for Capture ......................................................................................................................8
1.4 External Control by Capture Events.....................................................................................................8
1.5 Top-Level Control of Event Requests to/from a Timer in Capture Mode.............................................8
2Getting Started with CCU8 and Capture Mode Features................................................................9
2.1 Ultimate Initialization Sequence...........................................................................................................9
2.1.1 Ultimate Start-Up Enable .....................................................................................................................9
2.2 External Events Control Setup Registers.............................................................................................9
2.2.1 Using the External Capture Control Register Bitfields .........................................................................9
2.2.2 Pseudo Code for the Capture0 or Capture1 Setup..............................................................................9

Device Guide XMC4000
Advanced Signal Measurement
Confidential List of Figures
User Guide 5 <Revision 1.0>, <2012-30-03>
Device Guide
List of Figures
Figure 1 Timer Slice four Capture Registers......................................................................................................6
Figure 2 Slice Capture Logic..............................................................................................................................7
Figure 3 Capture by External Events Control.....................................................................................................8

Device Guide XMC4000
Advanced Signal Measurement
Confidential Advanced Signal Measurement
User Guide 6 <Revision 1.0>, <2012-30-03>
Device Guide
1 Advanced Signal Measurement
Each CAPCOM8 (CCU80/-81) is a multi purpose timer unit for many use cases. It is designed with repetitive
structures with multiple timer slices that have all the same base functionalities. This allows the development of
re-usable SW low level drivers. The main function blocks of 1 of the 4 CC8y slices on a CCU8x are shown here.
See Figure 1.
Figure 1 Timer Slice four Capture Registers
1.1 Slice Timer Setup in Capture Mode
There are 2 CAPCOM8 (CCU80/-81) with 4 timer slices each - and each slice has 4 capture value registers,
split into 2 pairs that will capture on selected event control input: Capt0 or Capt1 –according to 2 possible pair
schemes: either as 2 pairs for different events to Capt0 resp. Capt1 or cascaded for the same event via Capt1.
See Figure 2.

Device Guide XMC4000
Advanced Signal Measurement
Confidential Advanced Signal Measurement
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Device Guide
Figure 2 Slice Capture Logic
1.2 The Capture Algorithm
Each capture register has a Full-Flag that will be set on a capture-to and cleared on a read-from the register. At
a Capture Input Event (Capt1 or Capt0), each register will capture data from the next higher indexed register -
IF that higher one is full AND a lower indexed register than that is empty. The timer is seen as of highest index.
1.2.1 Disabling the Full-Flags
A continous capturing without any effect from Full-Flags may be set by setting the bit CC8yTC.CCS = 1. In this
case registers will capture data on the Capture Input Events without regarding the Full-Flags status.
1.3 Capture by External Events Control
This scenario regards how to link the Capture0 or the Capture1 register pairs to external trigger requests –from
any of the following: GPIO, ERU, POSIF, CAN, CCU4x, USIC, ADC, CCU8x or SCU. A Connection Pin Table
is given by the Top-Level Interconnection Matrix. A setup is done by the registers CC8yINS and CC8yCMC.

Device Guide XMC4000
Advanced Signal Measurement
Confidential Advanced Signal Measurement
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Figure 3 Capture by External Events Control
1.3.1 Timer Inputs for Capture
There are 3 selectable input lines with configurable source-event-condition profiles available for Capture by
external event control functions, extendable in the register CC8yTC and a read access register ECRD too that
simplifies administration of capture registers and full-flags, when more than one slice is used in Capture mode.
1.4 External Control by Capture Events
A capture event may trigger external actions via the Top-Level Interconnect matrix or request for an Interrupt.
Each CAPCOM8 has four Service Request Lines and each slice has a dedicated output signal CC8ySR[3...0]
selectable to a line by CC8ySRS. E.g. a capture event may request for some other unit action or for an interrupt.
1.5 Top-Level Control of Event Requests to/from a Timer in Capture Mode
Top-Level control means also conditional control of events requests between a slice and other action providers.
The Event Request Unit (ERU1) plus the Top-Level Interconnect matrix may combine, control and link event
signals according to user defined request-to-action event patterns - e.g. capture on timer and other event status.

Device Guide XMC4000
Advanced Signal Measurement
Confidential Getting Started with CCU8 and Capture Mode Features
User Guide 9 <Revision 1.0>, <2012-30-03>
Device Guide
2 Getting Started with CCU8 and Capture Mode Features
2.1 Ultimate Initialization Sequence
Before start and execution of a timer slice SW first time, the CAPCOM8 must have been initialized appropriately
according to a specific CAPCOM8 Initialization Sequence: 1. Apply Reset, 2. Release Reset, 3. Enable Clock,
4. Enable Prescaler Block, 5. Configure Global Control, 6. Configure Slice(s) Functions, Interrupts and Start-up.
2.1.1 Ultimate Start-Up Enable
In the last part of the ultimate CAPCOM8 Initialization Sequence the startup value(s) for a specific Compare
Channel Status of the Timer Slice(s) may be configured by the respective GCSS.SyTS bit. After that the default
IDLE mode has to be removed from the Timer Slice(s) in register GIDLC and Start or Global Start can be done!
2.2 External Events Control Setup Registers
The Input Selection register CC8yINS maps External-Event-Sources and Edge/Level Mode conditions to the
Event[2:0] Input Lines. In turn the Connection Matrix Control register CC8yCMC maps the three Event[2:0] Input
Lines to any of the 11 Input Functions. The registers CC8yTC + ECRD enable Extended Capture Read Modes.
2.2.1 Using the External Capture Control Register Bitfields
1. CC8yTC.CMOD CAPCOM Mode bit should be set =1. (CMOD=0 is Compare Mode by default)
2. CC8yCMC.CAP0S Input Capture0 Selection and Event Number x=0-2 Input Line Selection bitfield
3. CC8yINS.<Event-x bitfields> Event-x Source EVxIS (CC8yINS[P:A]) and Edge Mode EVxEM bitfields
4. CC8yCMC.CAP1S Input Capture1 Selection and Event Input Line Number x=0-2 Selection bitfield
5. CC8yINS.<Event-x bitfields> Event-x Source EVxIS (CC8yINS[P:A]) and Level Mode EVxEM bitfields
6. CC8yTC.ECM Extended Capture Mode enable bit (=0 by default, if no extended read mode)
7. ECRD Extended Capture Read Register (A Global read-only register, written by HW)
Note:The External Capture functions are Edge Sensitive.
Note:When using the index ‘x’ in event nomenclature, it should be understood as ‘Actual Event[2:0] Number ’.
Note:When using the index ‘x’ in CCU8x nomenclature, it should be understood as ‘Actual CCU8 Unit Number’.
Note:The Ultimate Event  Number ‘x’ for the CAP0S Function is always x == <CAP0S>-1 (when <CAP0S> != 0).
Note:The Ultimate Event  Number ‘x’ for the CAP1S Function is always x == <CAP1S>-1 (when <CAP1S> != 0).
2.2.2 Pseudo Code for the Capture0 or Capture1 Setup
// This is an independent 32-bit based Pseudo Code, regarding that there are no
connections to a certain CAPCOM8 Unit (CCU8x) nor specific Variable Declarations.
// step1
// Make MASK OPERATION first for bitfield focusing –if not first time –else:
CC8yCMC |= CAP0S_FUNCTION_AND_EVENT_NUMBER_BITFIELD //Init External Capture0
// step 2
CC8yINS &= CAP0S_SOURCE_AND_EVENT_MODES_BITFIELDS_MASK; // Focus on bitfields
CC8yINS |= CAPOS_SOURCE_AND_EVENT_MODES_BITFIELDS_PATTERN; //Paste setup pattern
// step3
// Make MASK OPERATION first for bitfield focusing –if not first time –else:
CC8yCMC |= CAP1S_FUNCTION_AND_EVENT_NUMBER_BITFIELD //Init External Capture1
// step 4
CC8yINS &= CAP1S_SOURCE_AND_EVENT_MODES_BITFIELDS_MASK; //Focus on bitfields
CC8yINS |= CAP1S_SOURCE_AND_EVENT_MODES_BITFIELDS_PATTERN; //Paste setup pattern

Device Guide XMC4000
Advanced Signal Measurement
Confidential Getting Started with CCU8 and Capture Mode Features
User Guide 10 <Revision 1.0>, <2012-30-03>
Device Guide
// step 1 and 3 could naturally be merged into one operation sequence, as follows:
// Make a MASK OPERATIONS first for bitfield focusing –if not first time –else:
CC8yCMC |= CAP01S_FUNCTIONS_AND_EVENTS_NUMBERS_BITFIELD //Init External Capture0&1
// step 2 & 4 could naturally be merged into one operation sequence, as follows:
CC8yINS &= CAP01S_SOURCES_AND_EVENTS_MODES_BITFIELDS_MASK; //Focus on bitfielfs
CC8yINS |= CAP01S_SOURCES_AND_EVENTS_MODES_BITFIELDS_PATTERN; //Paste both setups!

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