SH7041A datasheet(507/923 Pages) RENESAS

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Section 14 Serial Communication Interface (SCI)

14.1

Overview

The SH7040 Series has a serial communication interface (SCI) with two independent channels,

both of which possess the same functions.

The SCI supports both asynchronous and clock synchronous serial communication. It also has a

multiprocessor communication function for serial communication among two or more processors.

14.1.1

Features

• Select asynchronous or clock synchronous as the serial communications mode.

 Asynchronous mode: Serial data communications are synched by start-stop in character

units. The SCI can communicate with a universal asynchronous receiver/transmitter

(UART), an asynchronous communication interface adapter (ACIA), or any other chip that

employs a standard asynchronous serial communication. It can also communicate with two

or more other processors using the multiprocessor communication function. 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: one or none

Receive error detection: parity, overrun, and framing errors

Break detection: by reading the RxD level directly when a framing error occurs

 Clocked synchronous mode: Serial data communication is synchronized with a clock

signal. The SCI can communicate with other chips having a clock synchronous

communication function. 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.

• Internal or external transmit/receive clock source: baud rate generator (internal) or SCK pin

(external).

• Four types of interrupts: Transmit-data-empty, transmit-end, receive-data-full, and receive-

error interrupts are requested independently. The transmit-data-empty and receive-data-full

interrupts can start the direct memory access controller (DMAC)/data transfer controller (DTC)

to transfer data.

SH7041A Datasheet(PDF) 507 Page - Renesas Technology Corp