HD6475348R Datasheet, PDF (269/487 Pages) Hitachi Semiconductor – Single-Chip Microcomputer

Section 14 Serial Communication Interface
14.1 Overview
The H8/534 and H8/536 have two serial communication interface channels (SCI1 and SCI2) for
transferring serial data to and from other chips. Each channel supports both synchronous and
asynchronous data transfer. Communication control functions are provided by eight internal
registers.
14.1.1 Features
The features of the on-chip serial communication interface are:
• Selection of asynchronous or synchronous mode
— Asynchronous mode
SCI1 and SCI2 can communicate with a UART (Universal Asynchronous
Receiver/Transmitter), ACIA (Asynchronous Communication Interface Adapter), or other
chip that employs standard asynchronous serial communication. Eight data formats are
available.
— Data length: 7 or 8 bits
— Stop bit length: 1 or 2 bits
— Parity: Even, odd, or none
— Error detection: Parity, overrun, and framing errors
— Synchronous mode
SCI1 and SCI2 can communicate with chips able to synchronize data transfers with clock
pulses.
— Data length: 8 bits
— Error detection: Overrun errors
• Full duplex communication
The transmitting and receiving sections are independent, so each channel can transmit and
receive simultaneously. Both the transmit and receive sections use double buffering, so
continuous data transfer is possible in either direction.
• Built-in baud rate generator
Any specified bit rate can be generated.
• Internal or external clock source
The baud rate generator can operate on an internal clock source, or an external clock signal
input at the SCK pin.
• Three interrupts
Transmit-end, receive-end, and receive-error interrupts are requested independently. The
transmit-end and receive-end interrupts can be served by the on-chip data transfer controller
(DTC), providing a convenient way to transfer data with minimal CPU programming.
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