Datasheet

V850ES/JG3 CHAPTER 17 I
2
C BUS
R01UH0015EJ0300 Rev.3.00 Page 595 of 870
Sep 30, 2010
17.14.2 When communication reservation function is disabled (IICFn.IICRSVn bit = 1)
When the IICCn.STTn 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. There are two modes in which the 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 IICCn.LRELn bit was set to 1) (n = 0 to 2).
To confirm whether the start condition was generated or request was rejected, check the IICFn.STCFn flag. The time
shown in Table 17-7 is required until the STCFn flag is set after setting the STTn bit to 1. Therefore, secure the time by
software.
Table 17-7. Wait Periods
OCKSENm OCKSm1 OCKSm0 CLn1 CLn0 Wait Period
1 0 0 0 × 10 clocks
1 0 1 0 × 15 clocks
1 1 0 0 × 20 clocks
1 1 1 0 × 25 clocks
0 0 0 1 0 5 clocks
Remarks 1. ×: don’t care
2. n = 0 to 2
m = 0, 1