MC68711E20CFNE3 Datasheet, PDF (111/242 Pages) –

SCI Registers
7.7.3 Serial Communications Control Register 2
The SCCR2 register provides the control bits that enable or disable individual SCI functions.
Address: $102D
Bit 7
6
5
4
3
2
1
Bit 0
Read:
TIE
TCIE
RIE
ILIE
TE
RE
RWU
SBK
Write:
Reset: 0
0
0
0
0
0
0
0
Figure 7-5. Serial Communications Control Register 2 (SCCR2)
TIE — Transmit Interrupt Enable Bit
0 = TDRE interrupts disabled
1 = SCI interrupt requested when TDRE status flag is set
TCIE — Transmit Complete Interrupt Enable Bit
0 = TC interrupts disabled
1 = SCI interrupt requested when TC status flag is set
RIE — Receiver Interrupt Enable Bit
0 = RDRF and OR interrupts disabled
1 = SCI interrupt requested when RDRF flag or the OR status flag is set
ILIE — Idle-Line Interrupt Enable Bit
0 = IDLE interrupts disabled
1 = SCI interrupt requested when IDLE status flag is set
TE — Transmitter Enable Bit
When TE goes from 0 to 1, one unit of idle character time (logic 1) is queued as a preamble.
0 = Transmitter disabled
1 = Transmitter enabled
RE — Receiver Enable Bit
0 = Receiver disabled
1 = Receiver enabled
RWU — Receiver Wakeup Control Bit
0 = Normal SCI receiver
1 = Wakeup enabled and receiver interrupts inhibited
SBK — Send Break
At least one character time of break is queued and sent each time SBK is written to 1. As long as the
SBK bit is set, break characters are queued and sent. More than one break may be sent if the
transmitter is idle at the time the SBK bit is toggled on and off, as the baud rate clock edge could occur
between writing the 1 and writing the 0 to SBK.
0 = Break generator off
1 = Break codes generated
M68HC11E Family Data Sheet, Rev. 5.1
Freescale Semiconductor
111