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Block Diagram: Figure 10.1 shows a block diagram of SCI1.
ø
SCK
1
SI
1
SO
1
SCR1
SCSR1
SDRU
SDRL
PSS
Transfer bit counter
Transmit/receive
control circuit
Internal data bus
Legend:
SCR1:
SCSR1:
SDRU:
SDRL:
IRRS1:
PSS:
Serial control register 1
Serial control/status register 1
Serial data register U
Serial data register L
SCI1 interrupt request flag
Prescaler S
IRRS1
Figure 10.1 SCI1 Block Diagram
Pin Configuration: Table 10.2 shows the SCI1 pin configuration.
Table 10.2
Pin Configuration
Name
Abbrev.
I/O
Function
SCI1 clock pin
SCK
1
I/O
SCI1 clock input or output
SCI1 data input pin
SI
1
Input
SCI1 receive data input
SCI1 data output pin
SO
1
Output
SCI1 transmit data output