10.3
SCI3
10.3.1
Overview
In addition to SCI1, the H8/3887 Series has two serial communication interfaces, SCI3-1 and
SCI3-2, with identical functions. In this manual, the generic term SCI3 is used to refer to both of
these 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.
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
Parity
1 or 2 bits
Even, odd, or none
“1” or “0”
Multiprocessor bit
Receive error detection
Break detection
Parity, overrun, and framing errors
Break detected by reading the RXD3X pin level directly when a framing
error occurs
266
ETC [ ETC ]
