Information

CMT_MSC field descriptions (continued)
Field Description
3
BASE
Baseband Enable
When set, the BASE bit disables the carrier generator and forces the carrier output high for generation of
baseband protocols. When BASE is cleared, the carrier generator is enabled and the carrier output
toggles at the frequency determined by values stored in the carrier data registers. This bit is cleared by
reset. This bit is not double buffered and should not be written to during a transmission.
0 Baseband mode disabled
1
Baseband mode enabled
2
FSK
FSK Mode Select
The FSK bit enables FSK operation.
0 CMT operates in Time or Baseband mode
1
CMT operates in FSK mode
1
EOCIE
End of Cycle Interrupt Enable
A CPU interrupt will be requested when EOCF is set if EOCIE is high.
0 CPU interrupt disabled
1
CPU interrupt enabled
0
MCGEN
Modulator and Carrier Generator Enable
Setting MCGEN will initialize the carrier generator and modulator and will enable all clocks. Once
enabled, the carrier generator and modulator will function continuously. When MCGEN is cleared, the
current modulator cycle will be allowed to expire before all carrier and modulator clocks are disabled (to
save power) and the modulator output is forced low. To prevent spurious operation, the user should
initialize all data and control registers before enabling the system.
0 Modulator and carrier generator disabled
1
Modulator and carrier generator enabled
40.6.7 CMT Modulator Data Register Mark High (CMT_CMD1)
The contents of this register are transferred to the modulator down counter upon the
completion of a modulation period.
Address: CMT_CMD1 is 4006_2000h base + 6h offset = 4006_2006h
Bit 7 6 5 4 3 2 1 0
Read
MB[15:8]
Write
Reset
x* x* x* x* x* x* x* x*
* Notes:
x = Undefined at reset.•
Chapter 40 Carrier Modulator Transmitter (CMT)
K10 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc. 1045