Chapter 13 Ie Bus; Outline - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

Chapter 13:
IE Bus

13.1 Outline

IEBus (Inter Equipment Bus) is a small-scale two-line serial bus interface intended to transfer data
between equipment and equipment. It is designed for use in automotive and general industrial
applications.
The communication protocol of the IEBus has the following features:
• Multi-master method
All the units connected to the IEBus can transfer data to the other units.
• Multiaddress communication function (one unit can communicate to two or more units simultaneously)
Group communication: multiaddress communication to group unit
Broadcasting communication: multiaddress communication to all units
• Three different transfer rates can be selected:
Mode
• Transmit Data Buffer : 8-Byte FIFO
• Receive Data Buffer : 8-Byte FIFO
• CPU internal operation frequency: 12 MHz, 12.58 MHz
IE Bus Internal Frequency
at 6 MHz
0 Approx. 3.9 Kbps
2 Approx. 17 Kbps
3 Approx. 26 Kbps
IE Bus Internal Frequency
at 6 MHz
Approx. 4.1 Kbps
Approx. 18 Kbps
Approx. 27 Kbps