HD6417750 Datasheet, PDF (647/1039 Pages) Renesas Technology Corp – SuperH RISC engine

15.1.2 Block Diagram
Figure 15.1 shows a block diagram of the SCI.
Module data bus
SCRDR1
RxD
SCRSR1
TxD
SCK
SCTDR1
SCTSR1
SCSSR1
SCSCR1
SCSMR1
SCSPTR1
Transmission/
reception
control
SCBRR1
Baud rate
generator
Parity generation
Clock
Parity check
External clock
SCI
SCRSR1: Receive shift register
SCRDR1: Receive data register
SCTSR1: Transmit shift register
SCTDR1: Transmit data register
SCSMR1: Serial mode register
SCSCR1: Serial control register
SCSSR1: Serial status register
SCBRR1: Bit rate register
SCSPTR1: Serial port register
Figure 15.1 Block Diagram of SCI
Internal
data bus
Pφ
Pφ/4
Pφ/16
Pφ/64
TEI
TXI
RXI
ERI
Rev. 6.0, 07/02, page 595 of 986