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Note 1
Bit 3
Bit 2
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
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 19.1.7 (4) Locking and unlocking).
3.
The lock address is transferred in 1-byte (8-bit) units and is configured as follows:
Control bit: 4H
Control bit: 5H
CHAPTER 19
IEBus CONTROLLER (V850/SB2)
Table 19-2. Contents of Control Bits
Bit 1
Bit 0
0
0
Reads slave status
0
1
Undefined
1
0
Undefined
1
1
Reads data and locks
0
0
Reads lock address (lower 8 bits)
0
1
Reads lock address (higher 4 bits)
1
0
Reads slave status and unlocks
1
1
Reads data
0
0
Undefined
0
1
Undefined
1
0
Writes command and locks
1
1
Writes data and locks
0
0
Undefined
0
1
Undefined
1
0
Writes command
1
1
Writes data
MSB
Lower 8 bits
Undefined
User's Manual U13850EJ6V0UD
Function
Note 2
Note 3
Note 3
Note 2
Note 2
Note 2
LSB
Higher 4 bits
547
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