HD6432138SW datasheet(509/1061 Pages) RENESAS

509 / 1061 page

Section 16 I

2C Bus Interface [H8S/2138 Group Option]

Rev. 4.00 Jun 06, 2006 page 455 of 1004

REJ09B0301-0400

Section 16 I

2C Bus Interface [H8S/2138 Group Option]

A two-channel I

2C bus interface is available as an option in the H8S/2138 Group. The I2C bus

interface is not available for the H8S/2134 Group. Observe the following notes when using this

option.

1. For mask-ROM versions, a W is added to the part number in products in which this optional

function is used.

Examples: HD6432137SW

2. The product number is identical for F-ZTAT versions. However, be sure to inform your

Renesas sales representative if you will be using this option.

16.1

Overview

A two-channel I

2C bus interface is available for the H8S/2138 Group as an option. The I2C bus

interface conforms to and provides a subset of the Philips I

2C bus (inter-IC bus) interface

functions. The register configuration that controls the I

2C bus differs partly from the Philips

configuration, however.

Each I

2C bus interface channel uses only one data line (SDA) and one clock line (SCL) to transfer

data, saving board and connector space.

16.1.1

Features

• Selection of addressing format or non-addressing format

 I2C bus format: addressing format with acknowledge bit, for master/slave operation

 Serial format: non-addressing format without acknowledge bit, for master operation only

• Conforms to Philips I2C bus interface (I2C bus format)

• Two ways of setting slave address (I2C bus format)

• Start and stop conditions generated automatically in master mode (I2C bus format)

• Selection of acknowledge output levels when receiving (I2C bus format)

• Automatic loading of acknowledge bit when transmitting (I2C bus format)

• Wait function in master mode (I2C bus format)

A wait can be inserted by driving the SCL pin low after data transfer, excluding

acknowledgement. The wait can be cleared by clearing the interrupt flag.

HD6432138SW Datasheet(PDF) 509 Page - Renesas Technology Corp