H8SSLASH2224 datasheet(579/1071 Pages) RENESAS

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

Rev. 5.00 Aug 08, 2006 page 493 of 982

REJ09B0054-0500

14.1.3

Transfer Data (Data Field Contents)

The data filed contents are specified by the control bits.

Table 14.4 Control Bit Contents

Setting

Value

Bit 3*

Bit 2

Bit 1

Bit 0

Function*

H'0

Reads slave status (SSR)

H'1

Undefined

 do not use

H'2

Undefined

 do not use

H'3

Reads data and locks

H'4

Reads locked address (lower 8 bits)

H'5

Reads locked address (upper 4 bits)

H'6

Reads slave status (SSR) and unlocks

H'7

Reads data

H'8

Undefined

 do not use

H'9

Undefined

 do not use

H'A

Writes command and locks

H'B

Writes data and locks

H'C

Undefined

 do not use

H'D

Undefined

 do not use

H'E

111

0Writes command

H'F

111

1Writes data

Notes: 1. According to the value of bit 3 (MSB), the transfer directions of the message length bits

in the following message length field and data in the data field vary.

When bit 3 is 1: Data is transferred from the master unit to the slave unit.

When bit 3 is 0: Data is transferred from the slave unit to the master unit.

2. H'3, H'6, H'A, and H'B are control bits to specify lock setting and cancellation.

When the undefined values of H'1, H'2, H'8, H'9, H'C, and H'D are transmitted, the

acknowledge bit is not returned.

When the control bits received from another unit which locked are not included in table 14.5, the

slave unit which has been locked by the master unit rejects acceptance of the control bits and does

not return the acknowledge bit.

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