SH7261 datasheet(930/1348 Pages) RENESAS

930 / 1348 page

Section 20 IEBus

TM Controller (IEB) [R5S72612] [R5S72613]

Rev. 2.00 Sep. 07, 2007 Page 898 of 1312

REJ09B0320-0200

Bit

Bit Name

Initial

Value

R/W

Description

2 to 0

CMD

000

Command Bits

These bits issue a command to control IEB

communications. When the CMX flag in IEFLG is set

after the command issuance, the command is indicated

to be in execution. When the CMX flag becomes 0, the

operation state is entered.

000: No operation. Operation is not affected.

001: Unlock (required from other units)*

010: Requires communications as the master

011: Stops master communications*

100: Undefined bits*

101: Requires data transfer from the slave

110: Stops data transfer from the slave*

111: Undefined bits*

Notes: 1. Do not execute this command in slave communications.

2. This command is valid during master communications (MRQ = 1). In other states, this

command issuance is ignored. If this command is issued in master communications, the

communications controller immediately enters the wait state. At this time, the issued

master transmission request ends (MRQ = 0).

This command is valid during slave communications (SRQ = 1). In other states, this

command issuance is ignored. Once this command is issued in slave transmission, the

SRQ flag is 0 before slave transmission. Therefore, a transmit request from the master

is not responded to. If a transmit request is issued during slave transmission, the

transmission stops and the wait state is entered (SRQ = 0).

Undefined bits. Issuing this command does not affect operation.

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