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Block Diagram: Figure 10.3 shows a block diagram of SCI3.
External
clock
SCK
3
Clock
TXD
RXD
Legend:
RSR:
Receive shift register
RDR:
Receive data register
TSR:
Transmit shift register
TDR:
Transmit data register
SMR:
Serial mode register
SCR3:
Serial control register 3
SSR:
Serial status register
BRR:
Bit rate register
BRC:
Bit rate counter
Baud rate
generator
BRC
Transmit/receive
control
TSR
RSR
Figure 10.3 SCI3 Block Diagram
Internal clock
(ø/64, ø/16, ø/4, ø)
BRR
SMR
SCR3
SSR
TDR
RDR
Interrupt
requests
(TEI, TXI,
RXI, ERI)
221
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