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CHAPTER 19 I
2
C BUS
572
User’s Manual U16890EJ1V0UD
Table 19-5. Status During Arbitration and Interrupt Request Generation Timing
Status During Arbitration
Interrupt Request Generation Timing
During address transmission
Read/write data after address transmission
During extension code transmission
Read/write data after extension code transmission
During data transmission
During ACK signal transfer period after data reception
When restart condition is detected during data transfer
At falling edge of eighth or ninth clock following byte transfer
Note 1
When stop condition is detected during data transfer
When stop condition is output (when IICC0.SPIE0 bit = 1)
Note 2
When the SDA0 pin is at low level while attempting to
output a restart condition
At falling edge of eighth or ninth clock following byte transfer
Note 1
When stop condition is detected while attempting to output
a restart condition
When stop condition is output (when SPIE0 bit = 1)
Note 2
When the SDA0 pin is at low level while attempting to
output a stop condition
When the SCL0 pin is at low level while attempting to
output a restart condition
At falling edge of eighth or ninth clock following byte transfer
Note 1
Notes 1.
When the IICC0.WTIM0 bit = 1, an interrupt request occurs at the falling edge of the ninth clock. When
the WTIM0 bit = 0 and the extension code’s slave address is received, an interrupt request occurs at
the falling edge of the eighth clock.
2.
When there is a possibility that arbitration will occur, set the SPIE0 bit = 1 for master device operation.
19.12 Wakeup Function
The I
extension code has been received.
This function makes processing more efficient by preventing unnecessary interrupt requests from occurring when
addresses do not match.
When a start condition is detected, wakeup standby mode is set. This wakeup standby mode is in effect while
addresses are transmitted due to the possibility that an arbitration loss may change the master device (which has
output a start condition) to a slave device.
However, when a stop condition is detected, the IICC0.SPIE0 bit is set regardless of the wake up function, and this
determines whether interrupt requests are enabled or disabled.
2
C bus slave function is a function that generates an interrupt request signal (INTIIC0) when a local address or