Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 19 I

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