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12.5.9 Interrupt request (INTIIC0) generation timing and wait control
The setting of bit 3 (WTIM0) of IIC control register 0 (IICC0) determines the timing by which INTIIC0 is generated
and the corresponding wait control, as shown in Table 12-4.
WTIM0
During Slave Device Operation
Address
Notes 1, 2
0
9
Notes 1, 2
1
9
Notes 1. The slave device's INTIIC0 signal and wait period occurs at the falling edge of the ninth clock only when
there is a match with the address set to slave address register 0 (SVA0).
At this point, ACK is generated regardless of the value set to IICC0's bit 2 (ACKE0). For a slave device
that has received an extension code, INTIIC0 occurs at the falling edge of the eighth clock.
However, if the address does not match after restart, INTIIC0 is generated at the falling edge of the 9th
clock, but wait does not occur.
2. If the received address does not match the contents of slave address register 0 (SVA0) and extension
code is not received, neither INTIIC0 nor a wait occurs.
Remark
The numbers in the table indicate the number of the serial clock's clock signals. Interrupt requests and
wait control are both synchronized with the falling edge of these clock signals.
(1) During address transmission/reception
• Slave device operation:
• Master device operation: Interrupt and wait timing occur at the falling edge of the ninth clock regardless of
(2) During data reception
• Master/slave device operation: Interrupt and wait timing are determined according to the WTIM0 bit.
(3) During data transmission
• Master/slave device operation: Interrupt and wait timing are determined according to the WTIM0 bit.
(4) Wait cancellation method
The four wait cancellation methods are as follows.
• Writing data to IIC shift register 0 (IIC0)
• Setting bit 5 (WREL0) of IIC control register 0 (IICC0) (canceling wait)
• Setting bit 1 (STT0) of IIC0 register (generating start condition)
• Setting bit 0 (SPT0) of IIC0 register (generating stop condition)
Note Master only.
When an 8-clock wait has been selected (WTIM0 = 0), the presence/absence of ACK generation must be
determined prior to wait cancellation.
(5) Stop condition detection
INTIIC0 is generated when a stop condition is detected (only when SPIE0 = 1).
CHAPTER 12 SERIAL INTERFACE IIC0
Table 12-4. INTIIC0 Generation Timing and Wait Control
Data Reception
Data Transmission
Note 2
Note 2
8
8
Note 2
Note 2
9
9
Interrupt and wait timing are determined depending on the conditions described in
Notes 1 and 2 above, regardless of the WTIM0 bit.
the WTIM0 bit.
User's Manual U17854EJ9V0UD
During Master Device Operation
Address
Data Reception
9
8
9
9
Note
Note
Data Transmission
8
9
501
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