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Note 1
Bit 3
Bit 2
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Notes 1. The telegraph length bit of the telegraph length field and data transfer direction of the data field
change as follows depending on the value of bit 3 (MSB).
If bit 3 is '1': Transfer from master unit to slave unit
If bit 3 is '0': Transfer from slave unit to master unit
2. This is a control bit that specifies locking or unlocking (refer to 18.1.7 (4) Locking and unlocking).
3. The lock address is transferred in 1-byte (8-bit) units and is configured as follows:
520
CHAPTER 18 IEBus CONTROLLER
Table 18-2. Contents of Control Bits
Bit 1
Bit 0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
MSB
Control bit: 4H
Control bit: 5H
Undefined
Preliminary User's Manual U16541EJ1V0UM
Function
Read slave status
Undefined
Undefined
Note 2
Read data and lock
Read lock address (lower 8 bits)
Read lock address (higher 4 bits)
Note 2
Read slave status and unlock
Read data
Undefined
Undefined
Note 2
Write command and lock
Note 2
Write data and lock
Undefined
Undefined
Write command
Write data
Lower 8 bits
Higher 4 bits
Note 3
Note 3
LSB
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