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Section 21 IEBus
TM
Controller
Page 1096 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
21.1.3 Transfer Data (Data Field Contents)
The data field contents are specified by the control bits.
Table 21.4 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.
H'2 0 0 1 0 Undefined.
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.
H'9 1 0 0 1 Undefined.
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.
H'D 1 1 0 1 Undefined.
H'E 1 1 1 0 Writes command
H'F 1 1 1 1 Writes data
Notes: 1. Depending on 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 signal is not returned.
When the control bits received from another unit which locked are not included in table 21.5, the
slave unit which has been locked by the master unit does not accept the control bits and does not
return the acknowledge bit.