Information
Section Number Title Page
Chapter 38
Carrier Modulator Transmitter (CMT)
38.1 Introduction...................................................................................................................................................................837
38.2 Features.........................................................................................................................................................................837
38.3 Block diagram...............................................................................................................................................................838
38.4 Modes of operation.......................................................................................................................................................839
38.4.1 Wait mode operation....................................................................................................................................840
38.4.2 Stop mode operation....................................................................................................................................841
38.5 CMT external signal descriptions.................................................................................................................................841
38.5.1 CMT_IRO — Infrared Output.....................................................................................................................842
38.6 Memory map/register definition...................................................................................................................................842
38.6.1 CMT Carrier Generator High Data Register 1 (CMT_CGH1)....................................................................843
38.6.2 CMT Carrier Generator Low Data Register 1 (CMT_CGL1).....................................................................844
38.6.3 CMT Carrier Generator High Data Register 2 (CMT_CGH2)....................................................................844
38.6.4 CMT Carrier Generator Low Data Register 2 (CMT_CGL2).....................................................................845
38.6.5 CMT Output Control Register (CMT_OC).................................................................................................846
38.6.6 CMT Modulator Status and Control Register (CMT_MSC).......................................................................847
38.6.7 CMT Modulator Data Register Mark High (CMT_CMD1)........................................................................849
38.6.8 CMT Modulator Data Register Mark Low (CMT_CMD2).........................................................................849
38.6.9 CMT Modulator Data Register Space High (CMT_CMD3).......................................................................850
38.6.10 CMT Modulator Data Register Space Low (CMT_CMD4)........................................................................850
38.6.11 CMT Primary Prescaler Register (CMT_PPS)............................................................................................851
38.6.12 CMT Direct Memory Access Register (CMT_DMA).................................................................................852
38.7 Functional description...................................................................................................................................................852
38.7.1 Clock divider................................................................................................................................................852
38.7.2 Carrier generator..........................................................................................................................................853
38.7.3 Modulator.....................................................................................................................................................855
38.7.4 Extended space operation.............................................................................................................................859
38.8 CMT interrupts and DMA............................................................................................................................................861
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 31