MC9S08RC8 Datasheet, PDF (122/234 Pages) Freescale Semiconductor, Inc – Microcontrollers

Carrier Modulator Transmitter (CMT) Block Description
Table 8-8. CMTMSC Field Descriptions (continued)
Field
Description
1
EOCIE
0
MCGEN
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
Modulator and Carrier Generator Enable — Setting MCGEN will initialize the carrier generator and modulator
and enable all clocks. After it is 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
8.6.4 CMT Modulator Data Registers (CMTCMD1, CMTCMD2, CMTCMD3,
and CMTCMD4)
The modulator data registers control the mark and space periods of the modulator for all modes. The
contents of these registers are transferred to the modulator down counter and space period register upon
the completion of a modulation period.
Table 8-9. Sample Register Summary
Name
CMTCMD1
CMTCMD2
CMTCMD3
CMTCMD4
7
R
MB15
W
R
MB7
W
R
SB15
W
R
SB7
W
6
MB14
MB6
SB14
SB6
5
MB13
MB5
SB13
SB5
4
MB12
MB4
SB12
SB4
3
MB11
MB3
SB11
SB3
2
MB10
MB2
SB10
SB2
1
MB9
MB1
SB9
SB1
0
MB8
MB0
SB8
SB0
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
122
Freescale Semiconductor