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2. Block diagram
Figure 10-3 shows a block diagram of SCI3.
External
SCK
3x
clock
Clock
TXD
SPCR
RXD
Notation:
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
SPCR:
Serial port control register
256
Baud rate generator
BRC
Transmit/receive
control circuit
TSR
RSR
Figure 10-3 SCI3 Block Diagram
Internal clock (ø/64, ø/16, øw/2, ø)
BRR
SMR
SCR3
SSR
TDR
RDR
Interrupt request
(TEI, TXI, RXI, ERI)
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