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Section 13 Serial Communication Interface (SCI)

13.1

Overview

The SH7708 Series has an on-chip serial communication interface (SCI) that supports both

asynchronous and synchronous serial communication. It also has a multiprocessor communication

function for serial communication among two or more processors. The SCI supports a smart card

interface, which is a serial communications feature for IC card interfaces that conforms to the

ISO/IEC standard 7816-3 for identification cards. See section 14, Smart Card Interface, for more

information.

13.1.1

Features

SCI features are listed below.

• Asynchronous or synchronous can be selected as the serial communication mode.

• Asynchronous mode:

 Serial data communication is synchronized in start-stop mode in character units. The SCI

can communicate with a universal asynchronous receiver/transmitter (UART), an

asynchronous communication interface adapter (ACIA), or any other communications chip

that employs a standard asynchronous serial system. It can also communicate with two or

more other processors using the multiprocessor communication function. The maximum bit

rate is 937.5 kbps. There are twelve selectable serial data communication formats.

 Data length: Seven or eight bits

 Stop bit length: One or two bits

 Parity: Even, odd, or none

 Multiprocessor bit: 1 or 0

 Receive error detection: Parity, overrun, and framing errors

 Break detection: By reading the RxD level directly from the serial port register (SCSPTR)

when a framing error occurs

• Synchronous mode:

 Serial data communication is synchronized with a clock signal. The SCI can communicate

with other chips having a synchronous communication function. The maximum bit rate is 5

Mbps. There is one serial data communication format.

 Data length: Eight bits

 Receive error detection: Overrun errors

• Full duplex communication: The transmitting and receiving sections are independent, so the

SCI can transmit and receive simultaneously. Both sections use double buffering, so

continuous data transfer is possible in both the transmit and receive directions.

• On-chip baud rate generator with selectable bit rates

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