Hitachi H8/3692 ユーザーズマニュアル

Rev. 1.0, 07/01, page 181 of 372

Section 14   Serial Communication Interface3 (SCI3)

Serial Communication Interface (SCI) can handle both asynchronous and clocked synchronous
serial communication. In asynchronous mode, serial data communication can be carried out using
standard asynchronous communication chips such as a Universal Asynchronous
Receiver/Transmitter (UART) or an Asynchronous Communication Interface Adapter (ACIA). A
function is also provided for serial communication between processors (multiprocessor
communication function).

Figure 14-1 shows a block diagram of the SCI3.

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Choice of asynchronous or clocked synchronous serial communication mode

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Full-duplex communication capability

The transmitter and receiver are mutually independent, enabling transmission and reception to
be executed simultaneously.

Double-buffering is used in both the transmitter and the receiver, enabling continuous
transmission and continuous reception of serial data.

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On-chip baud rate generator allows any bit rate to be selected

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External clock or on-chip baud rate generator can be selected as a transfer clock source.

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Six interrupt sources

Transmit-end, transmit-data-empty, receive-data-full, overrun error, framing error, and parity
error.

Asynchronous mode

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Data length: 7 or 8 bits

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Stop bit length: 1 or 2 bits

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Parity: Even, odd, or none

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Receive error detection: Parity, overrun, and framing errors

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Break detection: Break can be detected by reading the RxD pin level directly in the case of a
framing error

Clocked Synchronous mode

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Data length: 8 bits

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Receive error detection: Overrun errors

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