Information

Section Number Title Page
21.4.4 Performance.................................................................................................................................................377
21.5 Initialization/application information...........................................................................................................................381
21.5.1 eDMA initialization.....................................................................................................................................381
21.5.2 Programming errors.....................................................................................................................................383
21.5.3 Arbitration mode considerations..................................................................................................................384
21.5.4 Performing DMA transfers (examples)........................................................................................................384
21.5.5 Monitoring transfer descriptor status...........................................................................................................388
21.5.6 Channel Linking...........................................................................................................................................390
21.5.7 Dynamic programming................................................................................................................................391
Chapter 22
External Watchdog Monitor (EWM)
22.1 Introduction...................................................................................................................................................................395
22.1.1 Features........................................................................................................................................................395
22.1.2 Modes of Operation.....................................................................................................................................396
22.1.3 Block Diagram.............................................................................................................................................397
22.2 EWM Signal Descriptions............................................................................................................................................398
22.3 Memory Map/Register Definition.................................................................................................................................398
22.3.1 Control Register (EWM_CTRL).................................................................................................................398
22.3.2 Service Register (EWM_SERV)..................................................................................................................399
22.3.3 Compare Low Register (EWM_CMPL)......................................................................................................400
22.3.4 Compare High Register (EWM_CMPH).....................................................................................................400
22.4 Functional Description..................................................................................................................................................401
22.4.1 The EWM_out Signal..................................................................................................................................401
22.4.2 The EWM_in Signal....................................................................................................................................402
22.4.3 EWM Counter..............................................................................................................................................402
22.4.4 EWM Compare Registers............................................................................................................................402
22.4.5 EWM Refresh Mechanism...........................................................................................................................403
22.4.6 EWM Interrupt.............................................................................................................................................403
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
16 Freescale Semiconductor, Inc.