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M16C/64C Group
25.3.6
Arbitration Lost
When all of the conditions below are met, the SDAMM pin signal level becomes low by an external
device and the I
(a) Transmit/receive (one of the following)
•
Slave address transmit (not an ACK clock) in master transmit mode or master receive mode
•
Data transmit (not an ACK clock) in master transmit mode
•
Start condition generated in master transmit mode or master receive mode
•
Stop condition generated in master transmit mode or master receive mode
(b) Internal SDA output: High
(c) SDAMM pin level: Low (sampling at the rising edge of the clock of SCLMM pin.)
Figure 25.12 shows Operation Example When Arbitration Lost is Detected.
During slave address transmission for example:
SCLMM
SDAMM
Internal SDA
AL bit in the S10 register
PIN bit in the S10 register
TRX bit in the S10 register
MST bit in the S10 register
IR bit in the IICIC register
Figure 25.12 Operation Example When Arbitration Lost is Detected
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
2
C interface determines that it has lost arbitration.
1
output
Levels matched
Slave address
2
3
4
5
SDA line open
Levels not matched
Arbitration lost detected
Set to 0 by interrupt request acceptance or by a program
2
25. Multi-master I
ACK
clock
6
7
9
Page 567 of 807
C-bus Interface
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