
MB90580C Series
DS07-13710-6E
67
16. IEBusTM Controller
The IEBusTM (Inter-Equipment Bus) is a small-scale, two-wire serial bus interface designed for data transfer
between pieces of equipment.
This interface is applicable, for example, as a bus interface for controlling vehicle-mounted devices.
IEBusTM has the following features:
Multitasking
Any of the units connected to the IEBusTM can transmit data to another one.
Broadcast function (Communication from one unit to multiple units)
Group broadcast : Broadcast to a group of units
All-unit broadcast
: Broadcast to all units
Three modes can be selected for different transmission speeds.
Data buffer for transmission
8-byte FIFO buffer
Data buffer for reception
8-byte FIFO buffer
CPU internal operating frequency (12 MHz, 12.58 MHz)
Frequency tolerance
In mode 0 or 1 :
±1.5%
In mode 2 :
±0.5%
(1) Register configuration
(Continued)
IEBusTM internal frequency
6 MHz
6.29 MHz
Mode 0
About 3.9 Kbps
About 4.1 Kbps
Mode 1
About 17 Kbps
About 18 Kbps
Mode 2
About 26 Kbps
About 27 Kbps
Local-office address setting register H
bit
15
14
13
12
11
10
9
8
Address
: 000071H
Reserved Reserved Reserved Reserved
MA11 MA10 MA09 MA08
MAWH
Access
(R/W) (R/W)
(R/W) (R/W) (R/W) (R/W) (R/W) (R/W)
Initial value
(X)
Local-office address setting register L
bit
7
6
5
4
3
210
Address
: 000070H
MA07 MA06 MA05 MA04 MA03 MA02 MA01 MA00
MAWL
Access
(R/W) (R/W)
(R/W) (R/W) (R/W) (R/W) (R/W) (R/W)
Initial value
(X)
Slave address setting register H
bit
15
14
13
12
11
10
9
8
Address
: 000073H
Reserved Reserved Reserved Reserved
SA11 SA10 SA09 SA08
SAWH
Access
(R/W) (R/W)
(R/W) (R/W) (R/W) (R/W) (R/W) (R/W)
Initial value
(X)