SH7261 datasheet(916/1348 Pages) RENESAS

916 / 1348 page

Section 20 IEBus

TM Controller (IEB) [R5S72612] [R5S72613]

Rev. 2.00 Sep. 07, 2007 Page 884 of 1312

REJ09B0320-0200

(a)

Master Transmission

The master unit outputs the message length bits and the parity bit. When the parity is even, the

slave unit returns an acknowledgement and enters the following data field. Note that the slave unit

does not return an acknowledgement in broadcast communications.

When the parity is odd, the slave unit decides that the message length field is not correctly

received, does not return an acknowledgement, and returns to the waiting (monitor) state. In this

case, the master unit also returns to the waiting state and communications end.

(b)

Master Reception

The slave unit outputs the message length bits and parity bit. When even parity is confirmed, the

master unit returns an acknowledgement.

When the parity is not correct, the master unit decides that the message length bits are not

correctly received, does not return an acknowledgement, and returns to the waiting state. In this

case, the slave unit also returns to the waiting state and communications end.

(6)

Data Field

The data field is a field for data transmission/reception to and from the slave unit. The master unit

transmits/receives data to and from the slave unit using the data field. The data field is comprised

of data bits, a parity bit, and an acknowledge bit.

The data bits consist of eight bits and the MSB is output first.

The parity and acknowledge bits are output following the data bits from the master unit and slave

unit, respectively.

Broadcast communications are performed only for the transmission of the master unit. In this case,

the acknowledge bit is ignored. Operations in master transmission and master reception are

described below.

SH7261 Datasheet(PDF) 916 Page - Renesas Technology Corp