Information

Section Number Title Page
21.3.31 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_BITER_ELINKNO)............................................................................................................469
21.4 Functional description...................................................................................................................................................470
21.4.1 eDMA basic data flow.................................................................................................................................470
21.4.2 Error reporting and handling........................................................................................................................473
21.4.3 Channel preemption.....................................................................................................................................475
21.4.4 Performance.................................................................................................................................................475
21.5 Initialization/application information...........................................................................................................................479
21.5.1 eDMA initialization.....................................................................................................................................479
21.5.2 Programming errors.....................................................................................................................................481
21.5.3 Arbitration mode considerations..................................................................................................................482
21.5.4 Performing DMA transfers..........................................................................................................................482
21.5.5 Monitoring transfer descriptor status...........................................................................................................486
21.5.6 Dynamic programming................................................................................................................................488
Chapter 22
External Watchdog Monitor (EWM)
22.1 Introduction...................................................................................................................................................................491
22.1.1 Features........................................................................................................................................................491
22.1.2 Modes of Operation.....................................................................................................................................492
22.1.3 Block Diagram.............................................................................................................................................493
22.2 EWM Signal Descriptions............................................................................................................................................494
22.3 Memory Map/Register Definition.................................................................................................................................494
22.3.1 Control Register (EWM_CTRL).................................................................................................................494
22.3.2 Service Register (EWM_SERV)..................................................................................................................495
22.3.3 Compare Low Register (EWM_CMPL)......................................................................................................496
22.3.4 Compare High Register (EWM_CMPH).....................................................................................................496
22.4 Functional Description..................................................................................................................................................497
22.4.1 The EWM_out Signal..................................................................................................................................497
22.4.2 The EWM_in Signal....................................................................................................................................498
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
18 Freescale Semiconductor, Inc.