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型號(hào)：	UPD703270GF-XXX-JBT
元件分類(lèi)：	微控制器/微處理器
英文描述：	32-BIT, MROM, 20 MHz, RISC MICROCONTROLLER, PQFP100
封裝：	14 X 20 MM, PLASTIC, QFP-100
文件頁(yè)數(shù)：	701/1080頁(yè)
文件大小：	6965K
代理商：	UPD703270GF-XXX-JBT

CHAPTER 18 IEBus CONTROLLER

User’s Manual U16541EJ4V0UD

(c) Broadcast communication flag (ALLTRNS)...Bit 4

Flag indicating whether the unit is performing broadcast communication. The contents of the flag are

updated in the broadcast field of each frame.

Except for initialization (reset) by system reset, the set/clear conditions vary depending on the receive data

of the broadcast field bit.

When “broadcast” is received by the broadcast field

Clear: When “individual” is received by the broadcast field, or upon the input of a system reset.

The broadcast flag is updated regardless of whether IEBus is the communication target

Figure 18-12. Example of Broadcast Communication Flag Operation

communication flag

by start bit

IEBus sequence

(d) Acknowledge transmission flag (ACK)...Bit 3

A flag that indicates whether the ACK signal has been transmitted in the acknowledge bit period of the

acknowledge bit field when IEBus is the receiving unit.

The contents of the flag are updated in the

acknowledge bit period of each frame. However, if the internal circuit is initialized by the occurrence of a

parity error, etc., the contents are not updated in the acknowledge bit period of that field.

(e) Lock status flag (LOCK)...Bit 2

A flag that indicates whether the unit is locked.

This flag is set (1) when the communication end flag (ISR.ENDTRNS bit) goes low and the frame

end flag (ISR.ENDFRAM bit) goes high after receipt of a lock specification (3H, 6H, AH, BH) in the

control field.

Clear: When the communication enable flag (BCR.ENIEBUS bit) is cleared (0).

When the communication end flag (ENDTRNS bit) is set (1) after receipt of a lock release (3H, 6H,

AH, BH) in the control field.

Lock specification/release is not possible in broadcast communication. In the lock

status, individual communication from a unit other than the one that requests locking is

not acknowledged. However, even communication from a unit other than the one that

requests locking is acknowledged as long as the communication is a slave status

request.

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