Section 11 Serial Communication Interface; Overview; Features - Hitachi H8/3035 Series Hardware Manual

Section 11 Serial Communication Interface

11.1 Overview

The H8/3035 Series has a serial communication interface (SCI). The SCI can communicate in
asynchronous mode or synchronous mode, and has a multiprocessor communication function for
serial communication among two or more processors.

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:
• Stop bit length: 1 or 2 bits
• Parity bit:
• Multiprocessor bit:
• Receive error detection: parity, overrun, and framing errors
• Break detection:
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.
• Data length:
• Receive error detection: overrun errors
• Full-duplex communication
The transmitting and receiving sections are independent, so the SCI can transmit and receive
simultaneously. The transmitting and receiving sections are both double-buffered, so serial
data can be transmitted and received continuously.
• Built-in baud rate generator with selectable bit rates
• Selectable transmit/receive clock sources: internal clock from baud rate generator, or
external clock from the SCK pin.
7 or 8 bits
even, odd, or none
1 or 0
by reading the RxD level directly when a framing error
8 bits
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