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Section 13 Serial Communication Interface 3 (SCI3)
Section 13 Serial Communication Interface 3 (SCI3)
This LSI includes a serial communication interface 3 (SCI3). The SCI3 can handle both
asynchronous and clocked synchronous serial communication. In asynchronous mode, serial data
communication can be carried out using standard asynchronous communication chips such as a
Universal Asynchronous Receiver/Transmitter (UART) or an Asynchronous Communication
Interface Adapter (ACIA). A function is also provided for serial communication between
processors (multiprocessor communication function).
Table 13.1 shows the SCI3 channel configuration and figure 13.1 shows a block diagram of the
SCI3. Since pin functions are identical for each of the two channels (SCI3 and SCI3_2), separate
explanations are not given in this section.
13.1 Features
• Choice of asynchronous or clocked synchronous serial communication mode
• Full-duplex communication capability
The transmitter and receiver are mutually independent, enabling transmission and reception to
be executed simultaneously.
Double-buffering is used in both the transmitter and the receiver, enabling continuous
transmission and continuous reception of serial data.
• On-chip baud rate generator allows any bit rate to be selected
• External clock or on-chip baud rate generator can be selected as a transfer clock source.
• Six interrupt sources
Transmit-end, transmit-data-empty, receive-data-full, overrun error, framing error, and parity
error.
Asynchronous mode
• Data length: 7 or 8 bits
• Stop bit length: 1 or 2 bits
• Parity: Even, odd, or none
• Receive error detection: Parity, overrun, and framing errors
• Break detection: Break can be detected by reading the RXD pin level directly in the case of a
framing error
SCI0010A_000120030300
Rev. 4.00 Sep. 23, 2005 Page 173 of 354
REJ09B0025-0400