Communication Address; Broadcast Communication - Renesas RZ/A Series User Manual

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RZ/A1L Group, RZ/A1LU Group, RZ/A1LC Group

Communication address

R01UH0437EJ0600 Rev.6.00

Jan 29, 2021

For the IEBus, each unit is assigned a specific 12-bit address. This communication

address consists of the following identification numbers.

• Higher 4 bits: Group number (number to identify the group to which each unit

• Lower 8 bits: Unit number (number to identify each unit in a group)

Normally, transmission or reception is performed between the master unit and its

partner slave unit on a one-to-one basis. During broadcast communication, however,

multiple slave units exist and the master unit executes transmission to these slave

units. Because multiple slave units exist, the NACK signal is returned by the

communicating slave unit as an acknowledge bit.

Whether broadcast communication or normal communication is to be executed is

selected by the broadcast bit. (For details about this bit, see 22.7.6 (2) Broadcast bit.)

Broadcast communication is classified into two types: group-unit broadcast

communication and all-unit broadcast communication. Group-unit broadcast and all-

unit broadcast are identified by the value of the slave address. (For the slave address,

see 22.7.6 (4) Slave address field.)

Group-unit broadcast communication

Broadcast communication is performed to the units in a group identified by the group

number indicated by the higher 4 bits of the communication address.

All-unit broadcast communication

Broadcast communication is performed to all the units, regardless of the value of the

group number.

22. IEBus Controller

Rz/a1 series Rz/a1lu series Rz/a1lc series