Datasheet

Section 14 IEBus™ Controller (IEB) [H8S/2258 Group]
Rev. 6.00 Mar. 18, 2010 Page 504 of 982
REJ09B0054-0600
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
7
6
5
4
IAR3
IAR2
IAR1
IAR0
0
0
0
0
R/W
R/W
R/W
R/W
Lower 4 Bits of IEBus Master Unit Address
Set the lower 4 bits of the master unit address.
3
2
IMD1
IMD0
0
0
R/W
R/W
IEBus Communications Mode
Set IEBus communications mode.
00: Communications mode 0
01: Communications mode 1
10: Communications mode 2
11: Setting prohibited
1 ⎯ 0 ⎯ Reserved
This bit is always read as 0 and cannot be modified.
0 STE 0 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)