Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
SCI Operation
10.5.2 Receiver
Figure 10-4 shows the structure of the SCI receiver. Refer to
Figure 10-3 for a summary of the SCI receiver I/O registers.
16X
BAUD RATE
÷16
T
P
RECEIVE SHIFT REGISTER
CLOCK
O
R
T
T
PD0/
RDI
PIN BUFFER
AND CONTROL
DATA
RECOVERY
8
7 6 5 4 3 2 1 0
DISABLE
DRIVER
IDLE MSB RDRF OR
RE
M
WAKEUP
LOGIC
SCCR1 ($000E)
SCSR ($0010)
SCDR ($0011)
RDRF
RIE
IDLE
ILIE
SCI TRANSMIT
REQUESTS
OR
RIE
SCCR2 ($000F)
SCI INTERRUPT
REQUEST
Figure 10-4. SCI Receiver
MC68HC705C8A — Rev. 3
MOTOROLA
Technical Data
Serial Communications Interface (SCI)
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