H8SSLASH2224 datasheet(612/1071 Pages) RENESAS

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

Rev. 5.00 Aug 08, 2006 page 526 of 982

REJ09B0054-0500

Bit

Bit Name

Initial

Value

R/W

Description

DLE

R/W

Overflow of Maximum Number of Receive Bytes in One

Frame

Indicates that the maximum number of bytes defined by

communications mode have been received because a

parity error or overrun error occurred, or that the reception

has not be completed because the message length value

exceeds the maximum number of receive bytes in one

frame. The IEB sets the RxE flag and enters the wait state.

[Setting condition]

When the reception has not been completed although the

maximum number of bytes defined by communications

mode have been received.

[Clearing condition]

When writing 0 after reading DLE = 1

R/W

Parity Error

Indicates that a parity error has occurred during data field

reception. If a parity error occurs before data field

reception, the IEB immediately enters the wait state and

the PE flag is not set.

If a parity error occurs when the maximum number of

receive bytes in one frame has not been received, the PE

flag is not set. When a parity error occurs, the IEB returns a

NAK to the communications destination unit via the

acknowledge bit. In this case, the communications

destination unit continues retransfer up to the maximum

number of receive bytes in one frame and if the reception

has been completed normally by clearing the parity error,

the PE flag is not set. If the parity error is not cleared when

the reception is terminated before receiving data for the

number of bytes specified by the message length, the PE

flag is set.

In broadcast reception, if a parity error occurs during data

field reception, the IEB enters the wait state immediately

after setting the PE flag.

[Setting condition]

When the parity bit of last data of the data field is not

correct after the maximum number of receive bytes has

been received

[Clearing condition]

When writing 0 after reading PE = 1

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