Datasheet

Section 20 Serial Communication Interface 3 (SCI3, IrDA)
REJ09B0465-0300 Rev. 3.00 Page 677 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
Section 20 Serial Communication Interface 3 (SCI3, IrDA)
This LSI includes a serial communication interface 3 (SCI3), which has three independent
channels. 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).
SCI3_2 provides IrDA (Infrared Data Association) communication waveform
transmission/reception according IrDA standard version 1.0.
Table 20.1 shows the SCI3 channel configuration and figure 20.1 shows a block diagram of the
SCI3. Since pin functions are identical for each of the three channels (SCI3, SCI3_2, and SCI3_3),
separate explanations are not given in this section.
20.1 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.
• 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. The DTC can be activated by the transmit-data-empty interrupt and receive-data-full
interrupt sources.
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