Information

Section Number Title Page
21.4.4 Performance.................................................................................................................................................379
21.5 Initialization/application information...........................................................................................................................383
21.5.1 eDMA initialization.....................................................................................................................................383
21.5.2 Programming errors.....................................................................................................................................385
21.5.3 Arbitration mode considerations..................................................................................................................386
21.5.4 Performing DMA transfers (examples)........................................................................................................386
21.5.5 Monitoring transfer descriptor status...........................................................................................................390
21.5.6 Channel Linking...........................................................................................................................................392
21.5.7 Dynamic programming................................................................................................................................393
Chapter 22
External Watchdog Monitor (EWM)
22.1 Introduction...................................................................................................................................................................397
22.1.1 Features........................................................................................................................................................397
22.1.2 Modes of Operation.....................................................................................................................................398
22.1.3 Block Diagram.............................................................................................................................................399
22.2 EWM Signal Descriptions............................................................................................................................................400
22.3 Memory Map/Register Definition.................................................................................................................................400
22.3.1 Control Register (EWM_CTRL).................................................................................................................400
22.3.2 Service Register (EWM_SERV)..................................................................................................................401
22.3.3 Compare Low Register (EWM_CMPL)......................................................................................................402
22.3.4 Compare High Register (EWM_CMPH).....................................................................................................402
22.4 Functional Description..................................................................................................................................................403
22.4.1 The EWM_out Signal..................................................................................................................................403
22.4.2 The EWM_in Signal....................................................................................................................................404
22.4.3 EWM Counter..............................................................................................................................................404
22.4.4 EWM Compare Registers............................................................................................................................404
22.4.5 EWM Refresh Mechanism...........................................................................................................................405
22.4.6 EWM Interrupt.............................................................................................................................................405
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
16 Freescale Semiconductor, Inc.