SH7261 datasheet(973/1348 Pages) RENESAS

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Section 20 IEBus

TM Controller (IEB) [R5S72612] [R5S72613]

Rev. 2.00 Sep. 07, 2007 Page 941 of 1312

REJ09B0320-0200

20.8

Usage Notes

20.8.1

Notes when the Communications have not been Completed within the Maximum

Number of Transmit Bytes

(1)

Data Transmission

During the data transmission, when the maximum number of bytes defined by the communications

mode have been transmitted because a NAK has been received from the receive unit, or when

transmission has not been completed within the maximum number of transmit bytes because the

message length value exceeds it, the IEB sets the error flag of IETSR and enters the wait state. In

this case, the IEB transmits data for the maximum number of transmit bytes + one byte. Then, if a

NAK has been received in an acknowledge bit of data for the maximum number of transmit bytes

+ one byte, the TXERO flag is set. If an ACK is received, the TXF flag is set.

Figure 20.18 shows the operation timing when the transmission has not been completed within the

maximum number of transmit bytes.

IETSR

TXER0

NAK is received in Dn + 1

ACK is received in Dn + 1

Master transmission

HD: Header

MA: Master address field

SA: Slave address field

CT: Control field

DL: Message length field

Dn: Data field (n = Max. no. of transfer bytes)

TXF

Dn-1

Dn+1

Figure 20.18 Operation Timing when Transmission has not been Completed within

Maximum Number of Transmit Bytes

(2)

Data Reception

During the data reception, when reception has not been completed within the maximum number of

bytes defined by the communications mode because of a parity error or overrun error causing the

retransfer of data, or when reception has not been completed because the message length value

exceeds the maximum number of receive bytes, the IEB sets the error flag of IERSR and enters

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