Hitachi H8/300L Series Manual page 98

Single-chip microcomputer
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Peripheral Functions
SCI3
Function: The SCI3 supports synchronous and asynchronous serial data transfers. It also has
a multi-processor communications function that supports serial communications
between multiple processors.
Features: • Serial data transfers in either synchronous or asynchronous mode
• Full duplex communication
• Double buffered data registers support continuous bidirectional
communication.
• Support for arbitrary bit rate selection using the built-in baud rate generator
• Either an internal or an external clock can be used as the transfer clock source.
• Generates six interrupts: transmission complete, transmission data empty,
receive data full, overrun error, framing error, and parity error.
Block Diagram
External clock
SCK3
Clock
TXD
RXD
<Notation>
RSR:
Receive shift register
RDR:
Receive data register
TSR:
Transmit shift register
TDR:
Transmit data register
SMR:
Serial mode register
Baud rate
generator
BRC
Transmit/receive
control circuit
TSR
RSR
SCR3:
Serial control register 3
SSR:
Serial status register
BRR:
Bit rate register
BRC:
Bit rate counter
Internal clock (ø/64, ø/16, ø/4, and ø)
BRR
SMR
SCR3
SSR
TDR
RDR
98
Interrupt requests
(TEI, TXI, RXI,
and ERI)

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