H8SSLASH2224 datasheet(611/1071 Pages) RENESAS

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

Rev. 5.00 Aug 08, 2006 page 525 of 982

REJ09B0054-0500

Bit

Bit Name

Initial

Value

R/W

Description

7 to 4



All 0



Reserved

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

OVE

R/W

Overrun Control Flag

Used to control the overrun during data reception. The IEB

sets the OVE and RxE flags when the IEB receives the

next byte data while the receive data has not been read

(the RxRDY flag is not cleared) and when the parity bit

reception has been started. If this flag remains set until

acknowledge bit transfer, 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 this flag remains set because the IEB

assumes that the overrun error has not been cleared.

If this flag is cleared to 0, the IEB decides that the overrun

error has been cleared, returns an ACK, and receives the

next data.

In broadcast reception, if this flag is set during

acknowledge bit transmission, the IEB immediately enters

the wait state.

[Setting condition]

When the next byte data is received while the RxRDY flag

is not cleared and when the parity bit of the data is

received.

[Clearing condition]

When writing 0 after reading OVE = 1

RTME

R/W

Timing Error

Set to 1 if data is not received at the timing specified by the

IEBus protocol during data reception. The IEB sets the RxE

flag and enters the wait state.

[Setting condition]

When a timing error occurs during data reception

[Clearing condition]

When writing 0 after reading RTME = 1

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