Datasheet
V850ES/JG3-H, V850ES/JH3-H CHAPTER 19 I
2
C BUS
R01UH0042EJ0500 Rev.5.00 Page 875 of 1513
Aug 12, 2011
19.14.2 When communication reservation function is disabled (IICFn.IICRSVn bit = 1)
When the IICCn.STTn bit is set when the bus is not being used for 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 the request was rejected, check the IICFn.STCFn flag. The
time shown in Table 19-7 is required until the STCFn flag is set after setting the STTn bit to 1. Therefore, secure the time
by software.
Table 19-7. Wait Periods
OCKSENm OCKSm1 OCKSm0 CLn1 CLn0 Wait Period
1 0 0 0 × 20 clocks
1 0 1 0 × 30 clocks
1 1 0 0 × 40 clocks
1 1 1 0 × 50 clocks
0 0 0 1 0 10 clocks
Remarks 1. ×: don’t care
2. n = 0 to 2
m = 0, 1