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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)：	766/1119頁(yè)
文件大小：	6653K
代理商：	UPD70F3357GJ(A)-GAE-AX

CHAPTER 18 IEBus CONTROLLER

User’s Manual U17790EJ2V0UD

(f) Write error occurrence flag (WERR) … Bit 2

This flag is set (1) if a write error occurs.

Clear: By software

A write error occurs if the data written to the DR register is not transmitted in the data field during unit

transmission. The timing of occurrence of a write error is illustrated below.

Figure 18-15. Timing of Write Error Occurrence

Acknowledge bit

Write error occurs if data is not

written to DR register during this period.

Cautions 1. Even when the WERR bit is set (1), the INTIE1 interrupt request signal may be

generated.

2. If the NACK signal is returned, the WERR bit is not set because data is

retransmitted.

(g) Third-party error occurrence flag (DEFLAG)…Bit 0

This flag is set (1) if a timing error or parity error occurs during communication regardless of the

unit (during communication between third parties).

Clear: By software

If an error occurs before the third-party communication starts even when the slave

address field does not match that of the unit (for example, if the NACK signal is received

when the received address does not match that of the unit in the slave address field (if

the NERR bit is set (1))), the DEFLAG bit is not set (1).

Communication between third parties may take place in the following two cases.

<1> If the received address in the slave address field does not match that of the unit (during

individual communication: Matching with UAR register, during broadcast communication:

Matching with group or FFFH) and if communication continues after the ACK signal has

been received, the unit monitors that communication.

<2> If the unit cannot respond to the received control data in the control field during broadcast

communication and if communication continues, the unit monitors that communication.

For example, this happens when the unit receives control data FH from master during

broadcast communication but the slave reception enable flag of the unit is disabled

(BCR.ENSLVRX bit = 0) (the NACK signal is returned and communication ends during

individual communication).

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