Infineon XMC4000 series User manual

Microcontroller
XMC4000
XMC4000 Family
User Guide
Device Guide
<Revision 1.0>, <2012-30-03>
CCU8 and Output State Override
Output State Override on External Events

Edition <2012-30-03>
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Infineon Technologies AG
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© 2012 Infineon Technologies AG
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Device Guide XMC4000
CCU8 and Output State Override
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Device Guide XMC4000
CCU8 and Output State Override
Table of Contents
User Guide 4 <Revision 1.0>, <2012-30-03>
Device Guide
Table of Contents
1Output State Override on External Events ......................................................................................6
1.1 Use Cases............................................................................................................................................6
2External Events Control of a Timer Output State ...........................................................................8
2.1 External Events Control of Timer Input Functions in general ..............................................................8
2.2 Selection of External Events Control Sources and Input Functions ....................................................8
2.3 Output Pin PASSIVE / ACTIVE Level Control .....................................................................................9
3Output State Override......................................................................................................................10
4Getting Started with CCU8 and Output State Override ................................................................11
4.1 Ultimate Initialization Sequence.........................................................................................................11
4.1.1 Ultimate Start-Up Enable ...................................................................................................................11
4.2 External Events Control Setup Registers...........................................................................................11
4.2.1 Using the Output State Override Control Register Bitfields...............................................................11
4.2.2 Pseudo Code for the Output State Override Setup............................................................................11
5Example Application for CCU8 and Output State Override.........................................................13
5.1 Principle of Peak&Hold with Current Limitation by Output State Override ........................................13

Device Guide XMC4000
CCU8 and Output State Override
List of Figures
User Guide 5 <Revision 1.0>, <2012-30-03>
Device Guide
List of Figures
Figure 1 Use case - Current Control and Protection by Monitoring using Output State Override .....................8
Figure 2 External Events Control of a Timer Slice Input Functions....................................................................8
Figure 3 Output State Override illustration.......................................................................................................10
Figure 5 Setting Output State Override Parameters (Control Registers).........................................................12
Figure 6 Principle of Peak&Hold with Current Limitation by Output State Override ........................................13

Device Guide XMC4000
CCU8 and Output State Override
Output State Override on External Events
User Guide 6 <Revision 1.0>, <2012-30-03>
Device Guide
1 Output State Override on External Events
It is possible to override the Output State of a slice with the value of an external source (or its complement
value) on the edge event of another external source. The source properties should be mapped to the CC8yINS
register and the override input function to the CC8yCMC register. Use case: E.g. output checking by monitoring.
1.1 Use Cases
Output State Override is useful for emergency protection (HW-TRAP) or hysteretic control (simple on/off via
external overcurrent comparator for primitive control loop). Note that comparator can be the ADC boundary flag.
Example: PWM timing adjustment on-the-fly by Output State Overrride with regard to critical current boundaries.
See Figure 1.

Device Guide XMC4000
CCU8 and Output State Override
Output State Override on External Events
User Guide 7 <Revision 1.0>, <2012-30-03>
Device Guide

Device Guide XMC4000
CCU8 and Output State Override
External Events Control of a Timer Output State
User Guide 8 <Revision 1.0>, <2012-30-03>
Device Guide
Figure 1 Use case - Current Control and Protection by Monitoring using Output State Override
2 External Events Control of a Timer Output State
An External Event Control request is a considered edge or level event signal from a peripheral unit or a GPIO. It
can be linked to CCU8xCC8y slices input selection stages via a comprehensive matrix. A slice that by any of its
3 events setups detects a considered source-event profile can be Output State Overriden remotely-like this way!
2.1 External Events Control of Timer Input Functions in general
There are 11 Timer Input Functions (as e.g. Bit Overrride), controlable by external events via 3 selectable input
lines with configurable source-event profile conditions to the Timer Slices CC8y (y=0-3) of a CCU8x unit (x=0-1)
for Start, Stop, Capture0-3, Gate, Up/Down, Load, Count, Status Bit Override, Trap & Modulate Output control.
See Figure 3.
2.2 Selection of External Events Control Sources and Input Functions
The Output State Override function can be linked to external trigger requests –such as the following sources:
GPIO, ERU, POSIF, CAN, CCU4x, USIC, ADC, CCU8x or SCU. Pin Connections are given by the Top-Level
Interconnect matrix and the CC8yINS[P:A] Input Select vector - and Function Select by the CC8yCMC register.
Figure 2 External Events Control of a Timer Slice Input Functions

Device Guide XMC4000
CCU8 and Output State Override
External Events Control of a Timer Output State
User Guide 9 <Revision 1.0>, <2012-30-03>
Device Guide
2.3 Output Pin PASSIVE / ACTIVE Level Control
The PASSIVE/ACTIVE state of a slice internal outputs (i.e. the status bits CCU8xSTyA/-B) is controlled by the
compare levels and the External Modulation Mode. Whether the external output pins CCU8xOUTy[3…0] should
be Passive Low / Active High or vice versa (e.g. the PWM), is controlled by the CC8yPSL10/-11/-22/-23 bits.

Device Guide XMC4000
CCU8 and Output State Override
Output State Override
User Guide 10 <Revision 1.0>, <2012-30-03>
Device Guide
3 Output State Override
See Figure 3.
Figure 3 Output State Override illustration

Device Guide XMC4000
CCU8 and Output State Override
Getting Started with CCU8 and Output State Override
User Guide 11 <Revision 1.0>, <2012-30-03>
Device Guide
4 Getting Started with CCU8 and Output State Override
4.1 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.
4.1.1 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!
4.2 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 Timer Control register CC8yTC enables different Mode Alternatives.
4.2.1 Using the Output State Override Control Register Bitfields
1. CC8yCMC.OFS Input Function Selection bit to enable the Output State Override Function
2. CC8yINS.<Event1 bitfields> Event1 Source EV1IS (CC8yINS[P:A]) and Edge Mode EV1EM bitfields
3. CC8yINS.<Event2 bitfields> Event2 Source EV2IS (CC8yINS[P:A]) and Level Mode EV2LM bitfields
4. CC8yTC.<Mode bitfields> Timer Mode selections e.g. Modes/Extended modes, Counting Schemes etc
Note:The Output State Override Function function is Edge Sensitive.
Note:The Carries of the Override State Value is Level Sensitive.
Note:Selection  of Event Numbers are Default!!! I.e. Event 1 is Trigger Edge signal, so the Output State
Override time point is controlled by Source 1. Event 2 is Carrier of Level signal, so the Output State
Override value is controlled by the level of Source 2.
4.2.2 Pseudo Code for the Output State Override 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 a MASK OPERATION first for bitfield focusing –if not first time –else:
CC8yCMC |= OFS_FUNCTION_AND_EVENTS_BITFIELDS // Enable the Output State Override
// step 2
CC8yINS &= OFS_SOURCE1_AND_EVENT1_MODES_BITFIELDS_MASK; //Focus on Source1 events
CC8yINS |= OFS_SOURCE1_AND_EVENT1_MODES_BITFIELDS_PATTERN;//Paste setup pattern
// step 3
CC8yINS &= OFS_SOURCE2_AND_EVENT2_MODES_BITFIELDS_MASK; //Focus on Source1 events
CC8yINS |= OFS_SOURCE2_AND_EVENT2_MODES_BITFIELDS_PATTERN;//Paste setup pattern
// step 2 & 3 could naturally be merged into one operation sequence, as follows:
CC8yINS &= OFS_SOURCES_AND_EVENTS_MODES_BITFIELDS_MASK; //Focus on all bitfielfs
CC8yINS |= OFS_SOURCES_AND_EVENTS_MODES_BITFIELDS_PATTERN; //Paste both setups!

Device Guide XMC4000
CCU8 and Output State Override
Getting Started with CCU8 and Output State Override
User Guide 12 <Revision 1.0>, <2012-30-03>
Device Guide
// Manipulation of the Output Pin PASSIVE/ACTIVE LEVEL control bit (PSL) if needed
// CC8yPSL = ACTUAL_PASSIVE_LEVEL // Use for LOW: 0x00000000 or HIGH: 0x00000001
// (There are no other bits but the PSL bit (CC8yPSL.PSL) in this register!)
Figure 5 Setting Output State Override Parameters (Control Registers)

Device Guide XMC4000
CCU8 and Output State Override
Example Application for CCU8 and Output State Override
User Guide 13 <Revision 1.0>, <2012-30-03>
Device Guide
5 Example Application for CCU8 and Output State Override
5.1 Principle of Peak&Hold with Current Limitation by Output State Override
Figure 6 Principle of Peak&Hold with Current Limitation by Output State Override

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