CHAPTER 16 I 2C BUSUser’s Manual U16896EJ2V0UD510Table 16-5. Status During Arbitration and Interrupt Request Generation TimingStatus During Arbitration Interrupt Request Generation TimingDuring address transmissionRead/write data after address transmissionDuring extension code transmissionRead/write data after extension code transmissionDuring data transmissionDuring acknowledgment transfer period after datareceptionWhen restart condition is detected during data transferAt falling edge of eighth or ninth clock following byte transfer Note 1When stop condition is detected during data transfer When stop condition is generated (when IICC0.SPIE0 bit = 1)Note 2When the SDA0 pin is at low level while attempting togenerate a restart conditionAt falling edge of eighth or ninth clock following byte transferNote 1When stop condition is detected while attempting togenerate a restart conditionWhen stop condition is generated (when SPIE0 bit = 1)Note 2When the SDA0 pin is at low level while attempting togenerate a stop conditionWhen the SCL0 pin is at low level while attempting togenerate a restart conditionAt falling edge of eighth or ninth clock following byte transferNote 1Notes 1. When the IICC0.WTIM0 bit = 1, an INTIIC0 signal occurs at the falling edge of the ninth clock. Whenthe WTIM0 bit = 0 and the extension code’s slave address is received, an INTIIC0 signal occurs at thefalling edge of the eighth clock.2. When there is a possibility that arbitration will occur, set the SPIE0 bit = 1 for master device operation.16.12 Wakeup FunctionThe I 2 C bus slave function is a function that generates an interrupt request signal (INTIIC0) when a local address orextension code has been received. This function makes processing more efficient by preventing the unnecessaryINTIIC0 signal 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 whileaddresses are transmitted due to the possibility that an arbitration loss may change the master device (which hasgenerated a start condition) to a slave device.However, when a stop condition is detected, the IICC0.SPIE0 bit is set regardless of the wakeup function, and thisdetermines whether the INTIIC0 signal is enabled or disabled.
