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CHAPTER 18 IEBus CONTROLLER (V850/SC2)
User’s Manual U15109EJ3V0UD
519
Figure 18-7. Bit Configuration of Slave Status
MSB
LSB
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit 0
Note 1
Meaning
0
Transmit data is not written in IEBus data register (DR)
1
Transmit data is written in IEBus data register (DR)
Bit 1
Note 2
Meaning
0
Receive data is not stored in IEBus data register (DR)
1
Receive data is stored in IEBus data register (DR)
Bit 2
Meaning
0
Unit is not locked
1
Unit is locked
Bit 3
Meaning
0
Fixed to 0
Bit 4
Note 3
Meaning
0
Slave transmission is stopped
1
Slave transmission is ready
Bit 5
Meaning
0
Fixed to 0
Bit 7
Bit 6
Meaning
0
0
Mode 0
0
1
Mode 1
1
0
Mode 2
1
1
Not used
Indicates the highest mode supported by unit
Note 4
.
Notes 1.
After reset: bit 0 is set to 1.
2.
The receive buffer size is 1 byte.
3.
When the V850/SC2 serves as a slave unit, this bit corresponds to the status indicated by bit 4
(ENSLVTX) of the IEBus control register (BCR).
4.
When the V850/SC2 serves as a slave unit, bits 7 and 6 are both fixed to mode 1 (bits 7, 6 = 0, 1).