Section 10 Serial Communication Interface
10.1 Overview
The H8/3864 Series is provided with two serial communication interfaces, SCI3-1 and SCI3-2.
These two SCIs have identical functions. In this manual, the generic term SCI3 is used to refer to
both SCIs.
Serial communication interface 3 (SCI3) can carry out serial data communication in either
asynchronous or synchronous mode. It is also provided with a multiprocessor communication
function that enables serial data to be transferred among processors.
10.1.1 Features
Features of SCI3 are listed below.
•
Choice of asynchronous or synchronous mode for serial data communication
-
Asynchronous mode
Serial data communication is performed asynchronously, with synchronization provided
character by character. In this mode, serial data can be exchanged with standard
asynchronous communication LSIs such as a Universal Asynchronous Receiver/Transmitter
(UART) or Asynchronous Communication Interface Adapter (ACIA). A multiprocessor
communication function is also provided, enabling serial data communication among
processors.
There is a choice of 16 data transfer formats.
Data length
7, 8, 5 bits
Stop bit length
1 or 2 bits
Parity
Even, odd, or none
Multiprocessor bit
“1” or “0”
Receive error detection
Parity, overrun, and framing errors
Break detection
Break detected by reading the RXD
3x
pin level directly when a
framing error occurs
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