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型號(hào)：	UPD70F3357GJ(A)-GAE-AX
元件分類：	微控制器/微處理器
英文描述：	32-BIT, FLASH, 32 MHz, RISC MICROCONTROLLER, PQFP144
封裝：	20 X 20 MM, LEAD FREE, PLASTIC, LQFP-144
文件頁(yè)數(shù)：	730/1119頁(yè)
文件大?。?/td>	6653K
代理商：	UPD70F3357GJ(A)-GAE-AX

CHAPTER 18 IEBus CONTROLLER

User’s Manual U17790EJ2V0UD

18.1.5 Broadcast communication

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, two or more slave units exist and the master unit executes

transmission to these slave units.

Because two or more 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

this bit, see 18.1.6 (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 18.1.6 (4) Slave address field).

(1) 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.

(2) All-unit broadcast communication

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

18.1.6 Transfer format of IEBus

Figure 18-1 shows the transfer signal format of the IEBus.

Figure 18-1. IEBus Transfer Signal Format

Control field

Frame format

Remarks 1. P: Parity bit

A: Acknowledge (ACK/NACK) bit

2. The master unit ignores the acknowledge bit during broadcast communication.

(1) Start bit

The start bit is a signal that informs the other units of the start of data transfer. The unit that is to start data

transfer outputs a high-level signal (start bit) from the IETX pin for a specific time, and then starts outputting

the broadcast bit.

If another unit has already output its start bit when one unit is to output the start bit, this unit does not output

the start bit but waits for completion of output of the start bit by the other unit. When the output of the start bit

by the other unit is complete, the unit starts outputting the broadcast bit in synchronization with the completion

of the start bit output by the other unit.

The units other than the one that has started communication detect this start bit, and enter the reception

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