NEC Renesas V850/SC1 User Manual page 516

Table 18-5. Control Field Acknowledge Signal Output Conditions
Communication Communication
type target (SLVRQ)
(ALL TRANS) Slave
Individual specification
communication = 1
= 1 No specification
= 0
Broadcast
communication
= 1
0 1
Communication Communication
type target (SLVRQ)
(ALL TRANS) Slave
Individual specification
communication = 1
= 1 No specification
Broadcast = 0
communication
= 1
0 1
Caution If the received control data is other than as shown in Table 18-5, it becomes × × × × unconditionally
(ACK is not returned).
Remarks 1. : ACK returned
×
: ACK not returned
2. ENSLVTX: Bit 4 of IEBus unit control register (BCR)
ENSLVRX: Bit 3 of IEBus unit control register (BCR)
SLVRQ:
LOCK:
PAR:
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CHAPTER 18 IEBus CONTROLLER (V850/SC2)
(a) When received control data is AH, BH, EH, FH
Lock status Master unit
(LOCK) judgment
Locked = 1 (match with PAR)
Unlocked = 0 Lock request unit =
1
Other = 0
0 don't care
1 1
Other than above
(b) When received control data is 0H, 3H, 4H, 5H, 6H, 7H
Lock status Master unit
(LOCK) judgment
Locked = 1 (match with PAR)
Unlocked = 0 Lock request unit =
1
Other = 0
0 don't care
1
1
Other than above
Bit 6 of IEBus unit status register (USR)
Bit 2 of IEBus unit status register (USR)
IEBus partner address register
User's Manual U15109EJ3V0UD
Slave Slave reception
transmission enable
(ENSLVRX)
enable
(ENSLVTX)
don't care 1
Slave Slave
transmission reception
enable enable
(ENSLVTX) (ENSLVRX)
0 don't care
1
don't care
1
Received control data
AH BH EH FH
×
Received control data
0H 3H 4H 5H 6H 7H
× × × ×
× ×
× × ×
× ×
×