MC68HC705C8A Datasheet, PDF (125/222 Pages) Motorola, Inc – HCMOS Microcontroller Unit

10.5.2 Receiver
Serial Communications Interface (SCI)
SCI Operation
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
CLOCK
PD0/
RDI
÷16
PIN BUFFER
AND CONTROL
DATA
RECOVERY
DISABLE
DRIVER
RE
M
RECEIVE SHIFT REGISTER
876543210
IDLE MSB RDRF OR
WAKEUP
LOGIC
SCCR1 ($000E)
SCSR ($0010)
SCI TRANSMIT
REQUESTS
RDRF
RIE
IDLE
ILIE
OR
RIE
SCI INTERRUPT
REQUEST
SCCR2 ($000F)
Figure 10-4. SCI Receiver
SCDR ($0011)
MC68HC705C8A — Rev. 2.0
MOTOROLA
Serial Communications Interface (SCI)
Technical Data
125