H8SSLASH2225 datasheet(593/1071 Pages) RENESAS

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

Rev. 5.00 Aug 08, 2006 page 507 of 982

REJ09B0054-0500

14.3.9

IEBus Transmit Buffer Register (IETBR)

IETBR is a 1-byte buffer to which data to be transmitted in master or slave transmission is written.

IETBR is empty when the TxRDY flag in IETSR is 1. Check the TxRDY flag before setting

transmit data in IETBR.

Data written in IETBR is transmitted in the data field in master or slave transmission. Figure 14.6

shows the correspondence between the communications signal format and registers for IEBus data

transfer.

Bit

Bit Name

Initial Value

R/W

Description

TBR7

TBR6

TBR5

TBR4

TBR3

TBR2

TBR1

TBR0

R/W

Data to be transmitted is written to this 1-byte

buffer.

IETBFL

[In master transmission]

[In slave transmission]

Communications frame

Notes: 1. In slave transmission, the received master address is not saved. If the unit is locked,

address comparison performed.

2. The received slave address is compared with IEAR1 and IEAR2, and if these addresses

match, operation continues.

3. In slave transmission, the received control bits are not saved. The received control bits

are decoded to decide the subsequent operation.

IETBR

Message length

bits

Data bits

Slave address

Master address

Control bits

Message length

bits

Data bits

Slave address

Master address

Control bits

IESA1, IESA2

IEAR1, IEAR2

CTL3 to CTL0

in IEMCR

(*1)

(*3)

(*2)

IEAR1, IEAR2

IETBFL

IETBR

Figure 14.6 Transmission Signal Format and Registers in Data Transfer

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