H8SLASH3028F datasheet(479/923 Pages) RENESAS

479 / 923 page

Rev. 2.00, 09/03, page 449 of 890

Section 13 Serial Communication Interface

13.1

Overview

The H8/3028 Group has a serial communication interface (SCI) with three independent channels.

All three channels have identical functions. The SCI can communicate in both asynchronous and

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 20.6, Module Standby Function.

The SCI also has a smart card interface function conforming to the ISO/IEC 7816-3 (Identification

Card) standard. This function supports serial communication with a smart card. Switching

between the normal serial communication interface and the smart card interface is carried out by

means of a register setting.

13.1.1

Features

SCI features are listed below.

• Selection of synchronous or asynchronous mode for serial communication

Asynchronous mode

Serial data communication is synchronized one channel 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 communication.

It can also communicate with two or more other processors using the multiprocessor

communication function. There are twelve selectable serial data transfer formats.

 Data length:

7 or 8 bits

 Stop bit length:

1 or 2 bits

 Parity:

even/odd/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

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 a single serial data communication format.

 Data length:

8 bits

 Receive error detection: overrun errors

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