H8SSLASH2224 datasheet(590/1071 Pages) RENESAS

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

Rev. 5.00 Aug 08, 2006 page 504 of 982

REJ09B0054-0500

14.3.4

IEBus Master Unit Address Register 1 (IEAR1)

IEAR1 sets the lower 4 bits of the master unit address and communications mode. In master

communications, the master unit address becomes the master address field value. In slave

communications, the master unit address is compared with the received slave address field.

Bit

Bit Name

Initial

Value

R/W

Description

IAR3

IAR2

IAR1

IAR0

R/W

Lower 4 Bits of IEBus Master Unit Address

Set the lower 4 bits of the master unit address.

IMD1

IMD0

R/W

IEBus Communications Mode

Set IEBus communications mode.

00: Communications mode 0

01: Communications mode 1

10: Communications mode 2

11: Setting prohibited



Reserved

This bit is always read as 0 and cannot be modified.

STE

R/W

Slave Transmission Setting

Sets bit 4 in the slave status register. Transmitting the

slave status register informs the master unit that the slave

transmission enabled state is entered by setting this bit to

1. Note that this bit only sets the slave status register value

and does not affect slave transmission directly.

0: Bit 4 in the slave status register is 0 (slave transmission

stop state)

1: Bit 4 in the slave status register is 1 (slave transmission

enabled state)

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