
Carrier Modulator Transmitter (CMT) Module
MC9S08RC/RD/RE/RG
104
Freescale Semiconductor
7.5.8 Background Mode Operation
When the microcontroller is in active background mode, the CMT temporarily suspends all counting until
the microcontroller returns to normal user mode.
7.6 CMT Registers and Control Bits
The following registers control and monitor CMT operation:
CMT carrier generator data registers (CMTCGH1, CMTCGL1, CMTCGH2, CMTCGL2)
CMT output control register (CMTOC)
CMT modulator status and control register (CMTMSC)
CMT modulator period data registers (CMTCMD1, CMTCMD2, CMTCMD3, CMTCMD4)
7.6.1 Carrier Generator Data Registers (CMTCGH1, CMTCGL1, CMTCGH2,
and CMTCGL2)
The carrier generator data registers contain the primary and secondary high and low values for generating
the carrier output.