Information

CMT_MSC field descriptions (continued)
Field Description
4
EXSPC
Extended Space Enable
Enables the extended space operation.
0 Extended space is disabled.
1
Extended space is enabled.
3
BASE
Baseband Enable
When set, BASE 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 field is cleared by reset. This field is not double-
buffered and must not be written to during a transmission.
0 Baseband mode is disabled.
1
Baseband mode is enabled.
2
FSK
FSK Mode Select
Enables FSK operation.
0 The CMT operates in Time or Baseband mode.
1
The CMT operates in FSK mode.
1
EOCIE
End of Cycle Interrupt Enable
Requests to enable a CPU interrupt when EOCF is set if EOCIE is high.
0 CPU interrupt is disabled.
1
CPU interrupt is enabled.
0
MCGEN
Modulator and Carrier Generator Enable
Setting MCGEN will initialize the carrier generator and modulator and will enable all
clocks. When 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.
NOTE: 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
Memory map/register definition
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
850 Freescale Semiconductor, Inc.