SH7261 datasheet(952/1348 Pages) RENESAS

952 / 1348 page

Section 20 IEBus

TM Controller (IEB) [R5S72612] [R5S72613]

Rev. 2.00 Sep. 07, 2007 Page 920 of 1312

REJ09B0320-0200

Bit

Bit Name

Initial

Value

R/W

Description

RXF

R/(W)*

Receive Normal Completion

Indicates that data for the number of bytes specified by

the message length bits has been received normally.

[Setting condition]

• When data for the number of bytes specified by the

message length bits has been received normally.

[Clearing condition]

• When 1 is written

RXEDE

R/(W)*

Broadcast Receive Error

Indicates that data could not be received because the

receive buffer is not in the receive enabled state (when

the RE bit is not set to 1 or the RXBSY flag is set.)

during receiving control field broadcast reception. This

bit functions when the DEE bit in IECTR is set to 1.

[Setting condition]

• When data could not be received during broadcast

reception.

[Clearing condition]

• When 1 is written

RXEOVE

R/(W)*

Receive Overrun Flag

Used to indicate the overrun during data reception. The

IEB sets this flag when the IEB receives the next byte

data while the receive data has not been read (the

RXBSY flag is not cleared). If this case, the IEB

assumes that an overrun error has occurred and

returns a NAK to the communications destination unit.

The communications destination unit retransmits data

up to the maximum number of transmit bytes. The IEB,

however, returns a NAK when the RXBSY flag remains

set.

If the RXBSY flag is cleared to 0, the IEB returns an

ACK, and receives the next data.

In broadcast reception, if the RXBSY flag is set during

data receive start, the IEB immediately enters the wait

state. This flag becomes enabled only after the receive

start flag (RXS) is set.

[Setting condition]

• When the next byte data is received while the

RXBSY flag is not cleared.

[Clearing condition]

• When 1 is written

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