Information
Section Number Title Page
Chapter 38
Carrier Modulator Transmitter (CMT)
38.1 Introduction...................................................................................................................................................................839
38.2 Features.........................................................................................................................................................................839
38.3 Block diagram...............................................................................................................................................................840
38.4 Modes of operation.......................................................................................................................................................841
38.4.1 Wait mode operation....................................................................................................................................842
38.4.2 Stop mode operation....................................................................................................................................843
38.5 CMT external signal descriptions.................................................................................................................................843
38.5.1 CMT_IRO — Infrared Output.....................................................................................................................844
38.6 Memory map/register definition...................................................................................................................................844
38.6.1 CMT Carrier Generator High Data Register 1 (CMT_CGH1)....................................................................845
38.6.2 CMT Carrier Generator Low Data Register 1 (CMT_CGL1).....................................................................846
38.6.3 CMT Carrier Generator High Data Register 2 (CMT_CGH2)....................................................................846
38.6.4 CMT Carrier Generator Low Data Register 2 (CMT_CGL2).....................................................................847
38.6.5 CMT Output Control Register (CMT_OC).................................................................................................848
38.6.6 CMT Modulator Status and Control Register (CMT_MSC).......................................................................849
38.6.7 CMT Modulator Data Register Mark High (CMT_CMD1)........................................................................851
38.6.8 CMT Modulator Data Register Mark Low (CMT_CMD2).........................................................................851
38.6.9 CMT Modulator Data Register Space High (CMT_CMD3).......................................................................852
38.6.10 CMT Modulator Data Register Space Low (CMT_CMD4)........................................................................852
38.6.11 CMT Primary Prescaler Register (CMT_PPS)............................................................................................853
38.6.12 CMT Direct Memory Access Register (CMT_DMA).................................................................................854
38.7 Functional description...................................................................................................................................................854
38.7.1 Clock divider................................................................................................................................................854
38.7.2 Carrier generator..........................................................................................................................................855
38.7.3 Modulator.....................................................................................................................................................857
38.7.4 Extended space operation.............................................................................................................................861
38.8 CMT interrupts and DMA............................................................................................................................................863
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 31