MMC2107 - Freescale Semiconductor

Freescale Semiconductor, Inc.
Serial Communications Interface Modules (SCI1 and SCI2)
Memory Map and Registers
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Freescale Semiconductor, I
NOTE:
TE — Transmitter Enable Bit
This read/write bit enables the transmitter and configures the TXD pin
as the transmitter output. Toggling TE queues an idle frame. Reset
clears TE.
1 = Transmitter enabled
0 = Transmitter disabled
RE — Receiver Enable Bit
This read/write bit enables the receiver. Reset clears RE.
1 = Receiver enabled
0 = Receiver disabled
When LOOPS = 0 and TE = RE = 1, the RXD pin is an input and the
TXD pin is an output regardless of the state of the DDRSC1 (TXD) and
DDRSC0 (RXD) bits.
RWU — Receiver Wakeup Bit
This read/write bit puts the receiver in a standby state that inhibits
receiver interrupt requests. The WAKE bit determines whether an idle
input or an address mark wakes up the receiver and clears RWU.
Reset clears RWU.
1 = Receiver asleep when RE = 1
0 = Receiver awake when RE = 1
SBK — Send Break Bit
Setting this read/write bit causes the SCI to send break frames of 10
(M = 0) or 11 (M =1) logic 0s. To send one break frame, set SBK and
then clear it before the break frame is finished transmitting. As long as
SBK is set, the transmitter continues to send break frames.
1 = Transmitter sends break frames.
0 = Transmitter does not send break frames.
MMC2107 – Rev. 2.0
Technical Data
MOTOROLA Serial Communications Interface Modules (SCI1 and SCI2) 341
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