2. Block diagram
Figure 10-6 shows a block diagram of SCI3.
Internal clock (ø/64, ø/16, øw/2, ø)
BRR
External
SCK3x
Baud rate generator
BRC
clock
Clock
SMR
SCR3
SSR
Transmit/receive
control circuit
TXD
RXD
TSR
RSR
TDR
RDR
SPCR
Interrupt request
(TEI, TXI, RXI, ERI)
Notation:
RSR:
RDR:
TSR:
TDR:
SMR:
Receive shift register
Receive data register
Transmit shift register
Transmit data register
Serial mode register
SCR3: Serial control register 3
SSR:
BRR:
BRC:
Serial status register
Bit rate register
Bit rate counter
SPCR: Serial port control register
Figure 10-6 SCI3 Block Diagram
268
ETC [ ETC ]
