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型號(hào)：	UPD178F098GF-3BA-A
元件分類：	微控制器/微處理器
英文描述：	8-BIT, FLASH, MICROCONTROLLER, PQFP100
封裝：	14 X 20 MM, PLASTIC, QFP-100
文件頁(yè)數(shù)：	315/559頁(yè)
文件大小：	3587K
代理商：	UPD178F098GF-3BA-A

CHAPTER 17

IEBus CONTROLLER (

PD178096A, 178098A, 178F098 ONLY)

User’s Manual U12790EJ2V0UD

(c) Lock setting conditions

Control Data

Broadcast Communication

Individual Communication

Communication End

Communication End

3H, 6HNote

0H, 4H, 5H, EH, FH

(d) Lock release conditions (while locked)

Control Data

Broadcast Communication from Lock Request Unit

Individual Communication from Lock Request Unit

Communication End

Communication End

3H, 6HNote

Remains locked

Remains locked

0H, 4H, 5H, EH, FH

Remains locked

Note The frame end of control data 6H (slave status read/unlock) occurs when the parity in the data field is odd,

and when the acknowledge signal from the IEBus unit is repeated up to the maximum number of transfer

bytes without being output.

17.1.8 Bit format

Caution The logic on the IEBus I/O pin of the

PD178098A Subseries and the logic of the IEBus protocol

(data on the IEBus) are inverted values. The following describes the case of the IEBus protocol.

<Example: Start bit>

PD178098A:

High level

IEBus protocol: Low level

The format of the bits constituting the communication frame of the IEBus is shown below.

Figure 17-9. Bit Format of IEBus

Synchronization

Preparation period:

First low-level (logic “1”) period

Synchronization period: Next high-level (logic “0”) period

Data period:

Period indicating value of bit

Stop period:

Last low-level (logic “1”) period

The synchronization period and data period are almost equal to each other in length.

The IEBus synchronizes each bit. The specifications on the time of the entire bit and the time related to the period

allocated to that bit differ depending on the type of the transmit bit, or whether the unit is the master unit or a slave unit.

The master and slave units monitor whether each period (preparation period, synchronization period, data period, and

stop period) is output for specified time while they are communicating. If a period is not output for the specified time, the

master and slave units report a timing error, immediately terminate communication and enter the standby status.

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