H8S56 Datasheet, PDF (599/980 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2500 Series

Section 17 IEBus™ Controller (IEB) [H8S/2552 Group]
17.1.3 Transfer Data (Data Field Contents)
The data filed contents are specified by the control bits.
Table 17.4 Control Bit Contents
Setting
Value Bit 3*¹ Bit 2
Bit 1
Bit 0
Function*²
H'0
0
0
0
0
Reads slave status (SSR)
H'1
0
0
0
1
Undefined. Setting prohibited.
H'2
0
0
1
0
Undefined. Setting prohibited.
H'3
0
0
1
1
Reads data and locks
H'4
0
1
0
0
Reads locked address (lower 8 bits)
H'5
0
1
0
1
Reads locked address (upper 4 bits)
H'6
0
1
1
0
Reads slave status (SSR) and unlocks
H'7
0
1
1
1
Reads data
H'8
1
0
0
0
Undefined. Setting prohibited.
H'9
1
0
0
1
Undefined. Setting prohibited.
H'A
1
0
1
0
Writes command and locks
H'B
1
0
1
1
Writes data and locks
H'C 1
1
0
0
Undefined. Setting prohibited.
H'D 1
1
0
1
Undefined. Setting prohibited.
H'E
1
1
1
0
Writes command
H'F
1
1
1
1
Writes 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 17.5, the
slave unit which has been locked by the master unit rejects acceptance of the control bits and does
not return the acknowledge bit.
Rev. 6.00 Sep. 24, 2009 Page 551 of 928
REJ09B0099-0600