H8SSLASH2225 datasheet(588/1071 Pages) RENESAS

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

Rev. 5.00 Aug 08, 2006 page 502 of 982

REJ09B0054-0500

14.3.3

IEBus Master Control Register (IEMCR)

IEMCR sets communications conditions for master communications (selection of broadcast or

normal communications, retransmission counts at arbitration loss, and control bits value). It is not

necessary to set this register for slave communications.

Bit

Bit Name

Initial

Value

R/W

Description

R/W

Broadcast/Normal Communications Select

Selects broadcast or normal communications for master

communications.

0: Broadcast communications

1: Normal communications

RN2

RN1

RN0

R/W

Retransmission Counts

Set the number of times retransmission is performed when

arbitration is lost in master communications. If arbitration is

lost for a specified number of times, the TxE flag in IETSR

and the AL flag in IETEF are set and transmission ends

with a transmit error. If arbitration is won during

retransmission, the retransmission count is automatically

restored to the initial setting after master address transfer.

000: 0

001: 1

010: 2

011: 3

100: 4

101: 5

110: 6

111: 7

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