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11.1.2 Block Diagram
Figure 11-1 shows a block diagram of the SCI.
RxD
TxD
SCK
RDR
RSR
TDR
TSR
SSR
SCR
SMR
BRR
Module data bus
Bus interface
Internal
data bus
Transmit/
receive control
Baud rate
generator
ø
ø/4
ø/16
ø/64
Clock
Parity generation
Parity check
TEI
TXI
RXI
ERI
Legend
External clock
RSR:
RDR:
TSR:
TDR:
SMR:
SCR:
SSR:
BRR:
Receive shift register
Receive data register
Transmit shift register
Transmit data register
Serial mode register
Serial control register
Serial status register
Bit rate register
Figure 11-1 SCI Block Diagram