Infineon XMC4000 series User manual

Microcontroller

XMC4000

XMC4000 Family

User Guide

Device Guide

CCU8 and Output State Override

Output State Override on External Events

Edition <2012-30-03>

Published by

Infineon Technologies AG

81726 Munich, Germany

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Device Guide XMC4000

CCU8 and Output State Override

Template: IFX_Template_2011-02-24.dot

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Last Trademarks Update 2011-02-24

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

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

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