NEC V850/SB1 User Manual page 285

(2) IIC status registers 0, 1 (IICS0, IICS1)
IICSn indicates the status of the I
IICSn can be set by an 8-bit or 1-bit memory manipulation instruction. IICSn is a read-only register (n = 0, 1).
RESET input sets IICSn to 00H.
After reset: 00H R
<7> <6>
IICSn MSTSn ALDn
(n = 0, 1)
MSTSn
0 Slave device status or communication standby status
1 Master device communication status
Condition for clearing (MSTSn = 0)
• When a stop condition is detected
• When ALDn = 1
• Cleared by LRELn = 1
• When IICEn changes from 1 to 0
• When RESET is input
ALDn
0 This status means either that there was no arbitration or that the arbitration result was a "win".
1 This status indicates the arbitration result was a "loss". MSTSn is cleared.
Condition for clearing (ALDn = 0)
• Automatically cleared after IICSn is read
• When IICEn changes from 1 to 0
• When RESET is input
Note This register is also cleared when a bit manipulation instruction is executed for bits other than IICSn.
Remark LRELn: Bit 6 of IIC control register n (IICCn)
IICEn:
CHAPTER 10 SERIAL INTERFACE FUNCTION
2
Cn bus.
Address: FFFFF342H, FFFFF352H
<5> <4>
EXCn COIn
Note
Bit 7 of IIC control register n (IICCn)
User's Manual U13850EJ6V0UD
<3> <2> <1>
TRCn ACKDn STDn
Master device status
Condition for setting (MSTSn = 1)
• When a start condition is generated
Detection of arbitration loss
Condition for setting (ALDn = 1)
• When the arbitration result is a "loss".
(1/3)
<0>
SPDn
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