Information

Section number Title Page
21.3.31 TCD Beginning Minor Loop Link, Major Loop Count (Channel Linking Disabled)
(DMA_TCDn_BITER_ELINKNO)............................................................................................................445
21.4 Functional description...................................................................................................................................................446
21.4.1 eDMA basic data flow.................................................................................................................................446
21.4.2 Error reporting and handling........................................................................................................................449
21.4.3 Channel preemption.....................................................................................................................................451
21.4.4 Performance.................................................................................................................................................451
21.5 Initialization/application information...........................................................................................................................456
21.5.1 eDMA initialization.....................................................................................................................................456
21.5.2 Programming errors.....................................................................................................................................458
21.5.3 Arbitration mode considerations..................................................................................................................458
21.5.4 Performing DMA transfers (examples)........................................................................................................459
21.5.5 Monitoring transfer descriptor status...........................................................................................................463
21.5.6 Channel Linking...........................................................................................................................................464
21.5.7 Dynamic programming................................................................................................................................466
Chapter 22
External Watchdog Monitor (EWM)
22.1 Introduction...................................................................................................................................................................471
22.1.1 Features........................................................................................................................................................471
22.1.2 Modes of Operation.....................................................................................................................................472
22.1.3 Block Diagram.............................................................................................................................................473
22.2 EWM Signal Descriptions............................................................................................................................................474
22.3 Memory Map/Register Definition.................................................................................................................................474
22.3.1 Control Register (EWM_CTRL).................................................................................................................474
22.3.2 Service Register (EWM_SERV)..................................................................................................................475
22.3.3 Compare Low Register (EWM_CMPL)......................................................................................................475
22.3.4 Compare High Register (EWM_CMPH).....................................................................................................476
22.4 Functional Description..................................................................................................................................................477
22.4.1 The EWM_out Signal..................................................................................................................................477
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc.
Preliminary
17
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