H8SSLASH2225 datasheet(567/1071 Pages) RENESAS

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Section 14 IEBus™ Controller (IEB) [H8S/2258 Group]

Rev. 5.00 Aug 08, 2006 page 481 of 982

REJ09B0054-0500

Section 14 IEBus

 Controller (IEB) [H8S/2258 Group]

This LSI has an on-chip one-channel IEBus™ controller (IEB). The Inter Equipment Bus



(IEBus

)*1 is a small-scaled digital data transfer system for inter equipment data transfer.

This LSI does not have an on-chip IEBus driver/receiver, so it is necessary to mount a dedicated

driver/receiver*2 externally.

Notes: 1. IEBus is a trademark of NEC Electronics Corporation.

2. Bus interface driver/receiver IC: HA12187FP is recommended.

14.1

Features

• IEBus protocol control (layer 2) supported

 Half duplex asynchronous communications

 Multi-master system

 Broadcast communications function

 Selectable mode (three types) with different transfer speeds

• Data transfer by the data transfer controller (DTC)

 Transfer buffer: 1 byte

 Reception buffer: 1 byte

 Up to 128 bytes of consecutive transfer/reception (maximum number of transfer bytes in

mode 2)

• Operating frequency

 12 MHz, 12.58 MHz (IEB uses 1/2 divided external clock)

Note:

±1.5% when mode 0 or 1 is used, ±0.5% when mode 2 is used

• Noise resistance is improved by mounting the IEBus driver/receiver (layer 1) externally

• Module stop mode can be set

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