MAC7200 datasheet(26/976 Pages) FREESCALE

26 / 976 page

MAC7200 Microcontroller Family Reference Manual, Rev. 2

xxvi

Freescale Semiconductor

27.3.1

Register Descriptions...................................................................................................483

27.3.1.1

Channel Configuration Registers.............................................................................483

27.4

Functional Description.....................................................................................................486

27.4.1

DMA Channels 0-7......................................................................................................486

27.4.2

DMA Channels 8-15....................................................................................................488

27.4.3

"Always Enabled" DMA Sources................................................................................489

27.5

DMA_CH_MUX Bus Aborts ..........................................................................................490

27.6

DMA_CH_MUX Differences from MAC71xx...............................................................490

27.7

Initialization/Application Information .............................................................................492

27.7.1

Reset.............................................................................................................................492

27.7.2

Enabling the DMA_CH_MUX....................................................................................492

27.7.3

Simple Setup from AG ................................................................................................492

27.7.4

Using the “Always Enabled” Feature to Periodically Drive GPIO Pins .....................493

27.7.5

Enabling and Configuring Sources ..............................................................................494

27.7.5.1

Enabling a Source with Periodic Triggering............................................................494

27.7.5.2

Enabling a Source without Periodic Triggering ......................................................495

27.7.6

Disabling a Source .......................................................................................................496

27.7.6.1

Switching the Source of a DMA Channel ...............................................................496

Chapter 28

FlexCAN2

28.1

FlexCAN2 Implementation on the MAC7200.................................................................499

28.1.1

Introduction..................................................................................................................499

28.1.2

Features of FlexCAN2 on MAC7200..........................................................................499

28.1.3

CAN Protocol ..............................................................................................................500

28.1.3.1

Terminology.............................................................................................................500

28.1.3.2

Data Frame...............................................................................................................500

28.1.3.3

Remove Frame.........................................................................................................501

28.1.3.4

Error Frame..............................................................................................................502

28.1.3.5

Overload Frame .......................................................................................................503

28.1.4

CAN Implementation...................................................................................................503

28.1.5

CAN External Pins.......................................................................................................503

28.1.6

FlexCAN Bus Aborts...................................................................................................503

28.1.7

CAN Differences from MAC71xx ..............................................................................504

28.1.8

CAN Application Usage ..............................................................................................504

28.1.8.1

Enabling the CAN....................................................................................................504

28.1.8.2

Message Buffer Initialization...................................................................................505

28.2

The Generic FlexCAN2 Module......................................................................................505

28.2.1

Block Diagram.............................................................................................................505

28.2.2

Overview......................................................................................................................506

28.2.3

Features........................................................................................................................507

28.2.4

Modes of Operation .....................................................................................................508

28.2.4.1

Normal Mode (User or Supervisor):........................................................................508

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