H8SSLASH2224 datasheet(605/1071 Pages) RENESAS

605 / 1071 page

Section 14 IEBus™ Controller (IEB) [H8S/2258 Group]

Rev. 5.00 Aug 08, 2006 page 519 of 982

REJ09B0054-0500

14.3.20 IEBus Transmit Error Flag Register (IETEF)

IETEF checks the source of a TxE interrupt indicated in IETSR. This register detects an overflow

of a maximum number of bytes in one frame, arbitration loss, underrun error, timing error, and

NAK reception.

Bit

Bit Name

Initial

Value

R/W

Description

7 to 5



All 0



Reserved

These bits are always read as 0 and cannot be modified.

R/W

Arbitration Loss

The IEB retransmits from the start bit for the number of

times specified by bits RN2 to Rn0 in IEMCR if the

arbitration has been lost in master communications. If the

arbitration has been lost for the specified number of times,

the AL and TxE flags are set to enter the wait state. If the

arbitration has been won within retransmit for the specified

number of times, this flag is not set to 1. This flag is set

only when the arbitration has been lost and the wait state is

entered.

[Setting condition]

When the arbitration has been lost during data

transmission and the transmission has been terminated

[Clearing condition]

When writing 0 after reading AL = 1

R/W

Underrun Error

Indicates that an underrun error has occurred during data

transmission. The IEB detects an underrun error

occurrence when the IEB fetches data from IETBR while

the TxRDY flag is set to 1, and the IEB sets the TxE flag

and enters the wait state. Accordingly, when the TxRDY

flag is not cleared even if data is written to IETBR, an

underrun error occurs and data transmission is terminated.

Note that the TxRDY flag must be cleared in data

transmission by the CPU.

[Setting condition]

When the IEB loads data from IETBR to the transmit shift

[Clearing condition]

When writing 0 after reading UE = 1

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