Datasheet

Section 14 IEBus™ Controller (IEB) [H8S/2258 Group]
Rev. 6.00 Mar. 18, 2010 Page 502 of 982
REJ09B0054-0600
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
7 SS 1 R/W Broadcast/Normal Communications Select
Selects broadcast or normal communications for master
communications.
0: Broadcast communications
1: Normal communications
6
5
4
RN2
RN1
RN0
0
0
0
R/W
R/W
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