Hitachi H8/3637 Hardware Manual page 216

Block Diagram: Figure 10.1 shows a block diagram of SCI1.
PSS
ø
SCK
1
SI
1
SO
1
Legend:
SCR1: Serial control register 1
SCSR1: Serial control/status register 1
SDRU: Serial data register U
SDRL: Serial data register L
IRRS1: SCI1 interrupt request flag
PSS: Prescaler S
Pin Configuration: Table 10.2 shows the SCI1 pin configuration.
Table 10.2 Pin Configuration
Name
SCI1 clock pin
SCI1 data input pin
SCI1 data output pin
212
Transmit/receive
control circuit
Figure 10.1 SCI1 Block Diagram
Abbrev. I/O
SCK I/O
1
SI Input
1
SO Output
1
SCR1
SCSR1
Transfer bit counter
SDRU
SDRL
Function
SCI1 clock input or output
SCI1 receive data input
SCI1 transmit data output
IRRS1