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User’s Manual U11969EJ3V0UM00
CHAPTER 8 SERIAL INTERFACE FUNCTION
Figure 8-21. Example of Arbitration Timing
Status when Arbitration Occurs
Interrupt Request Issue Timing
Address transmitting
Fall of the eighth or ninth clock after byte transfer
Note 1
Read/write information after address transmission
Transferring extension code
Read/write information after extension code transmission
Transmitting data
ACK transfer period after data transmission
Transferring data, restart condition detection
Transferring data, stop condition detection
Stop condition output (SPIE = 1)
Note 2
Attempted to output restart condition but data is low level
Fall of the eighth or ninth clock after byte transfer
Note 1
Attempted to output restart condition but stop condition is detected
Stop condition output (SPIE = 1)
Note 2
Attempted to output stop condition but data is low level
Fall of the eighth or ninth clock after byte transfer
Attempted to restart condition but SCL is low level
Notes 1. When WTIM (bit 3 of the IIC control register (IICC)) = 1, interrupt generates at the fall of the ninth clock.
When WTIM = 0 and when slave address of extension code is received, interrupt generates at the fall
of the eighth clock.
2. If arbitration may occur, set SPIE = 1 in master operation.
Hi-Z
Hi-Z
Master 1 arbitration defeat
Master 1
SCL
SDA
SCL
SDA
SCL
SDA
Master 2
Transfer line
Содержание V854 UPD703006
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