Datasheet

Section 14 IEBus™ Controller (IEB) [H8S/2258 Group]
Rev. 6.00 Mar. 18, 2010 Page 481 of 982
REJ09B0054-0600
Section 14 IEBus™ Controller (IEB) [H8S/2258 Group]
This LSI has an on-chip one-channel IEBus™ controller (IEB). The Inter Equipment Bus™
(IEBus™)*
1
is a small-scaled digital data transfer system for inter equipment data transfer.
This LSI does not have an on-chip IEBus driver/receiver, so it is necessary to mount a dedicated
driver/receiver*
2
externally.
Notes: 1. IEBus is a trademark of NEC Electronics Corporation.
2. Bus interface driver/receiver IC: HA12187FP is recommended.
14.1 Features
• IEBus protocol control (layer 2) supported
⎯ Half duplex asynchronous communications
⎯ Multi-master system
⎯ Broadcast communications function
⎯ Selectable mode (three types) with different transfer speeds
• Data transfer by the data transfer controller (DTC)
⎯ Transfer buffer: 1 byte
⎯ Reception buffer: 1 byte
⎯ Up to 128 bytes of consecutive transfer/reception (maximum number of transfer bytes in
mode 2)
• Operating frequency
⎯ 12 MHz, 12.58 MHz (IEB uses 1/2 divided external clock)
Note: ±1.5% when mode 0 or 1 is used, ±0.5% when mode 2 is used
• Noise resistance is improved by mounting the IEBus driver/receiver (layer 1) externally
• Module stop mode can be set