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Section 21 IEBus
TM
Controller
R01UH0134EJ0400 Rev. 4.00 Page 1087 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
(4) Broadcast Communications
In normal transfer, a single master unit communicates with a single slave unit, so one-to-one
transfer or reception takes place. In broadcast communications, a single master unit communicates
with multiple slave units. Since there are multiple slave units, no acknowledgements are returned
from the slave units during communications.
A broadcast bit decides whether broadcast or normal communications is done. (For details of the
broadcast bit, see section 21.1.2 (1) (b), Broadcast Bit.
There are two types of broadcast communications.
(a) Group broadcast communications
Broadcast communications is aimed at units with the same group number, meaning that those units
have the same upper four bits of the communications address.
(b) General broadcast communications
Broadcast communications is aimed at all units regardless of group number.
Group broadcast and general broadcast communications are identified by a slave address. (For
details on the slave address, see section 21.1.2 (3), Slave Address Field.)