MC68HC11KA4TS Datasheet, PDF (42/68 Pages) Motorola, Inc – 8-Bit Microcontroller

RE — Receiver Enable
0 = Receiver disabled
1 = Receiver enabled
RWU — Receiver Wakeup Control
0 = Normal SCI receiver
1 = Wakeup enabled and receiver interrupts inhibited
SBK — Send Break
0 = Break generator off
1 = Break codes generated as long as SBK = 1
SCSR1 —SCI Status Register 1
$0074
Bit 7
6
5
4
3
2
1
Bit 0
TDRE
TC
RDRF
IDLE
OR
NF
FE
PF
RESET:
1
1
0
0
0
0
0
0
TDRE — Transmit Data Register Empty Flag
This flag is set when SCDR is empty. Clear the TDRE flag by reading SCSR1 with TDRE set and then
writing to SCDR.
0 = SCDR busy
1 = SCDR empty
TC — Transmit Complete Flag
This flag is set when the transmitter is idle (no data, preamble, or break transmission in progress). Clear
the TC flag by reading SCSR1 with TC set and then writing to SCDR.
0 = Transmitter busy
1 = Transmitter idle
RDRF — Receive Data Register Full Flag
Once cleared, IDLE is not set again until the RxD line has been active and becomes idle again. RDRF
is set if a received character is ready to be read from SCDR. Clear the RDRF flag by reading SCSR1
with RDRF set and then reading SCDR.
0 = SCDR empty
1 = SCDR full
IDLE — Idle Line Detected Flag
This flag is set if the RxD line is idle. Once cleared, IDLE is not set again until the RxD line has been
active and becomes idle again. The IDLE flag is inhibited when RWU = 1. Clear IDLE by reading SCSR1
with IDLE set and then reading SCDR.
0 = RxD line is active
1 = RxD line is idle
OR — Overrun Error Flag
OR is set if a new character is received before a previously received character is read from SCDR. Clear
the OR flag by reading SCSR1 with OR set and then reading SCDR.
0 = No overrun
1 = Overrun detected
NF — Noise Error Flag
NF is set if majority sample logic detects anything other than a unanimous decision. Clear NF by reading
SCSR1 with NF set and then reading SCDR.
0 = Unanimous decision
1 = Noise detected
MOTOROLA
42
MC68HC11KA4
MC68HC11KA4TS/D