Infineon Technologies XMC4000 Application Kit Manuel utilisateur

Microcontroller

XMC4000

XMC4500 Family

User Guide

Device Guide

CCU4 and External Load

Timer Reload on External Events

Edition <2012-30-03>

Published by

Infineon Technologies AG

81726 Munich, Germany

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Device Guide XMC4500

External Load - CCU4

Confidential

Revision History

Page or Item

Subjects (major changes since previous revision)

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Limited.

Last Trademarks Update 2011-02-24

Device Guide XMC4500

External Load - CCU4

Confidential List of Figures

Table of Contents

1Timer Reload on External Events.....................................................................................................5

1.1 Timer Load Basics................................................................................................................................5

1.2 Timer Load by External Events Control ...............................................................................................5

2Getting Started with CCU4 and External Load................................................................................7

2.1 Ultimate Initialization Sequence...........................................................................................................7

2.1.1 Ultimate Start-Up Enable .....................................................................................................................7

2.2 External Events Control Setup Registers.............................................................................................7

2.2.1 Using the External Load Control Register Bitfields..............................................................................7

2.2.2 Using the External Up/Down Control Register Bitfields .......................................................................7

2.3 Pseudo Code for the External Load Setup ..........................................................................................7

List of Figures

Figure 1 CCU4 Basic Slice and Timer Load on External Events.......................................................................5

Figure 2 Timer Load Selection Control...............................................................................................................5

Figure 3 Timer Reload from Compare Register or Period Register on External Events ...................................6

Device Guide XMC4500

External Load - CCU4

Confidential Timer Reload on External Events

1 Timer Reload on External Events

Each CAPCOM4 (CCU40/../43) 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 CC4y slices on a CCU4x are shown here.

See Figure 1.

Figure 1 CCU4 Basic Slice and Timer Load on External Events

1.1 Timer Load Basics

See Figure 2.

An external source may trigger a Timer Reload transfer from either the compare register CRy (if counting up) or

from the period register PRy (if counting down). The count direction bit CC4yTCST.CDIR can be set by HW by

another source. The input source(s) and function(s) should be mapped to the CC4yINS & CC4yCMC registers.

Figure 2 Timer Load Selection Control

1.2 Timer Load by External Events Control

This scenario regards how to link the Timer Load input function to external trigger requests –from any of the

following sources: GPIO, ERU, POSIF, CAN, CCU4x, USIC, ADC, CCU8x or SCU. Pin Connections are given

by the Top-Level Interconnect and the CC4yINS[P:A] Input Select - and Load function by the CC4yCMC.LDS.

Device Guide XMC4500

External Load - CCU4

Confidential Timer Reload on External Events

See Figure 3.

Figure 3 Timer Reload from Compare Register or Period Register on External Events

Device Guide XMC4500

External Load - CCU4

Confidential Getting Started with CCU4 and External Load

2 Getting Started with CCU4 and External Load

2.1 Ultimate Initialization Sequence

Before start and execution of a timer slice SW first time, the CAPCOM4 must have been initialized appropriately

according to a specific CAPCOM4 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 CAPCOM4 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!

All these topics are covered in detail by the Reference Manual: <<< Link to 23.6.1 Initialization Sequence >>>

2.2 External Events Control Setup Registers

The Input Selection register CC4yINS maps External-Event-Sources and Edge/Level Mode conditions to the

Event[2:0] Input Lines. In turn the Connection Matrix Control register CC4yCMC maps the three Event[2:0] Input

Lines to any of the 11 Input Functions. The Timer Status bit CC4yTCST.CDIR controls the Counting Direction.

2.2.1 Using the External Load Control Register Bitfields

1. CC4yCMC.LDS Map the Load Function Selector to an Event Input Line Number x=0-2

2. CC4yINS.<Event-x bitfields> Event-x Source EVxIS (CC4yINS[P:A]) and Edge Mode EVxEM bitfields

2.2.2 Using the External Up/Down Control Register Bitfields

3. CC4yCMC.UDS Map the Up/Down Function Selector to an Event Input Line Number x=0-2

4. CC4yINS.<Event-x bitfields> Event-x Source EVxIS (CC4yINS[P:A]) and Level Mode EVxLM bitfields

Note:The Up/Down Counting Direction control works indirectly via the unwritable CC4yTCST.CDIR status bit

Note:The External Load function is Edge Sensitive.

Note:The External Up/Down Direction Control function is Level 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 CCU4x nomenclature, it should be understood as ‘Actual CCU4 Unit Number’.

Note:The Ultimate Event



Number ‘x’ for the LDS Input Function is always x == <LDS>-1 (when <LDS> != 0).

2.3 Pseudo Code for the External Load Setup

// This is an independent 32-bit based Pseudo Code, regarding that there are no

connections to a certain CAPCOM4 Unit (CCU4x) nor specific Variable Declarations.

// step1

// Make a MASK OPERATION first for bitfield focusing –if not first time –else:

CC4yCMC |= LDS_FUNCTION_AND_EVENT_NUMBER_BITFIELD //Initialize Load and Event Nr

// step 2

CC4yINS &= LDS_SOURCE_AND_EVENT_MODES_BITFIELDS_MASK; //Focus on bitfields

CC4yINS |= LDS_SOURCE_AND_EVENT_MODES_BITFIELDS_PATTERN; //Paste setup pattern

// step3

CC4yCMC |= UDS_FUNCTION_AND_EVENT_NUMBER_BITFIELD //Initialize UDS and Event Nr

// step 4

Device Guide XMC4500

External Load - CCU4

Confidential Getting Started with CCU4 and External Load

CC4yINS &= UDS_SOURCE_AND_EVENT_MODES_BITFIELDS_MASK; // Focus on bitfields

CC4yINS |= UDS_SOURCE_AND_EVENT_MODES_BITFIELDS_PATTERN; //Paste setup pattern

// step 1 & 3 could naturally be merged into one operation sequence, as follows:

// Make a MASK OPERATIONS first for bitfield focusing –if not first time –else:

CC4yCMC |= LDS_AND_UDS_FUNCTIONS_AND_EVENTS_NRS_BITFIELDS //Init Ext. Load and UDS

// step 2 & 4 could naturally be merged into one operation sequence, as follows:

CC4yINS &= LDS_UDS_SOURCES_AND_EVENTS_MODES_BITFIELDS_MASK; //Focus on bitfielfs

CC4yINS |= LDS_UDS_SOURCES_AND_EVENTS_MODES_BITFIELDS_PATTERN; //Paste all setups!

w w w . i n f i n e o n . c o m

Published by Infineon Technologies AG

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