H8SLASH3021 datasheet(355/712 Pages) RENESAS

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11. Serial Communication Interface

Rev.2.00 Mar. 22, 2007 Page 331 of 684

REJ09B0352-0200

Section 11 Serial Communication Interface

11.1

Overview

The H8/3022 Group has a serial communication interface (SCI) with two independent channels.

The two channels are functionally identical. The SCI can communicate in asynchronous or

synchronous mode. It also has a multiprocessor communication function for serial communication

among two or more processors.

When the SCI is not used, it can be halted to conserve power. Each SCI channel can be halted

independently. For details see section 17.6, Module Standby Function.

Channel 0 (SCI0) also has a smart card interface function conforming to the ISO/IEC7816-3

(Identification Card) standard. This function supports serial communication with a smart card. For

details, see section 12, Smart Card Interface.

11.1.1

Features

SCI features are listed below.

• Selection of asynchronous or synchronous mode for serial communication

a. Asynchronous mode

Serial data communication is synchronized one character at a time. The SCI can communicate

with a universal asynchronous receiver/transmitter (UART), asynchronous communication

interface adapter (ACIA), or other chip that employs 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:

7 or 8 bits

⎯ Stop bit length:

1 or 2 bits

⎯ Parity bit:

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 when a framing error occurs

b. Synchronous mode

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

other chips having a synchronous communication function. There is one serial data

communication format.

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