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Section 11 Serial Communication Interface
11.1 Overview
The H8/3039 Series 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:
Stop bit length:
Parity bit:
Multiprocessor bit:
Receive error detection:
Break detection:
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:
7 or 8 bits
1 or 2 bits
even, odd, or none
1 or 0
parity, overrun, and framing errors
by reading the RxD level directly when a framing error occurs
8 bits
overrun errors
327
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