HD6433937 Datasheet, PDF (268/521 Pages) Hitachi Semiconductor – Hardware Manual

2. Block diagram
Figure 10-3 shows a block diagram of SCI3.
External
SCK3x _{clock Baud rate generator}
Clock
BRC
Transmit/receive
control circuit
Internal clock (ø/64, ø/16, øw/2, ø)
BRR
SMR
SCR3
SSR
TXD
RXD
SPCR
TSR
RSR
TDR
RDR
Notation:
RSR:
RDR:
TSR:
TDR:
SMR:
SCR3:
SSR:
BRR:
BRC:
SPCR:
Receive shift register
Receive data register
Transmit shift register
Transmit data register
Serial mode register
Serial control register 3
Serial status register
Bit rate register
Bit rate counter
Serial port control register
Figure 10-3 SCI3 Block Diagram
Interrupt request
(TEI, TXI, RXI, ERI)
256