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