mc68hc11k4 Freescale Semiconductor, Inc, mc68hc11k4 Datasheet - Page 162

• Manufacturer Part Number: mc68hc11k4
• Description: Mc68hc11k1 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Serial Communications Interface (SCI)
7.9.4 Serial Communication Status Register 1
Technical Data
162
Address $0074
TE — Transmitter Enable Bit
RE — Receiver Enable Bit
RWU — Receiver Wakeup Control
SBK — Send Break Bit
The SCSR provides flags for various SCI conditions which can be polled
or used to generate SCI system interrupts. To clear any set flag, read
SCSR while the flag is set and then write to SCDR.
Reset:
Read:
Write:
When TE goes from 0 to 1, one unit of idle character time (logic 1) is
queued as a preamble.
At least one character time of break is queued and sent each time
SBK is written to 1. Multiple breaks 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.
Freescale Semiconductor, Inc.
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0 = Transmitter disabled
1 = Transmitter enabled
0 = Receiver disabled
1 = Receiver enabled
0 = Normal SCI receiver operation
1 = Wakeup is enabled and receiver interrupts are inhibited.
0 = Break generator off
1 = Break codes generated as long as SBK = 1
Serial Communications Interface (SCI)
TDRE
Bit 7
1
Figure 7-9. SCI Status Register 1 (SCSR1)
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TC
6
1
RDRF
5
0
IDLE
4
0
OR
3
0
NF
2
0
M68HC11K Family
FE
1
0
MOTOROLA
Bit 0
PF
0