Section 22 Serial Communication Interface 1 (Sci1); Overview; Features - Hitachi H8S/2199 Hardware Manual

Single-chip microcomputer

Table of Contents

Section 22 Serial Communication Interface 1 (SCI1)

The serial communication interface (SCI) can handle both asynchronous and clocked synchronous

serial communication. A function is also provided for serial communication between processors

(multiprocessor communication function).

SCI1 features are listed below.

• Choice of asynchronous or synchronous serial communication mode

 Asynchronous mode

• Serial data communication is executed using an asynchronous system in which

synchronization is achieved character by character

Serial data communication can be carried out with standard asynchronous

communication chips such as a Universal Asynchronous Receiver/Transmitter (UART)

or Asynchronous Communication Interface Adapter (ACIA)

• A multiprocessor communication function is provided that enables serial data

communication with a number of processors

• Choice of 12 serial data transfer formats

Data length: 7 or 8 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 can be detected by reading the SI1 pin level directly in case of a

framing error

 Clock synchronous mode

• Serial data communication is synchronized with a clock

Serial data communication can be carried out with other chips that have a synchronous

communication function

• One serial data transfer format

Data length: 8 bits

• Receive error detection: Overrun errors detected

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