Rev. 1.0, 02/00, page 399 of 1141
22.1.2
Block Diagram
Figure 22.1 shows a block diagram of the SCI.
SI1
SO1
SCK1
Clock
External clock
φ
φ
/4
φ
/16
φ
/64
TEI
TXI
RXI
ERI
RSR1
RDR1
TSR1
TDR1
SMR1
SCR1
SSR1
SCMR1
BRR1
: Receive shift register 1
: Receive data register 1
: Transmit shift register 1
: Transmit data register 1
: Serial mode register 1
: Serial control register 1
: Serial status register 1
: Serial interface mode register 1
: Bit rate register 1
SCMR1
SSR1
SCR1
SMR1
Transmission/
reception
control
Baud rate
generator
BRR1
Module data bus
Bus interface
Internal data bus
RDR1
TSR1
RSR1
Parity generation
Parity check
[Legend]
TDR1
Figure 22.1 Block Diagram of SCI