CHAPTER 16 I
2
C BUS
User’s Manual U16896EJ2V0UD
514
16.13.2 When communication reservation function is disabled (IICF0.IICRSV0 bit = 1)
When the IICC0.STT0 bit is set when the bus is not used in a communication during bus communication, this
request is rejected and a start condition is not generated. The following two statuses are included in the status where
bus is not used.
•
When arbitration results in neither master nor slave operation
•
When an extension code is received and slave operation is disabled (ACK is not returned and the bus was
released when the IICC0.LREL0 bit was set to 1)
To confirm whether the start condition was generated or request was rejected, check the IICF0.STCF0 flag. The
time shown in Table 16-7 is required until the STCF0 flag is set after setting the STT0 bit = 1. Therefore, secure the
time by software.
Table 16-7. Wait Periods
CL01
CL00
Selected Clock
Wait Period
0 0
f
XX
/2 6
clocks
0 1
f
XX
/2 6
clocks
1 0
f
XX
3
clocks
1 1
f
XX
/3 9
clocks
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