UPD70F3793GC-UEU-AX Datasheet, PDF (743/1113 Pages) Renesas Technology Corp – RENESAS MCU V850ES/Jx3-L Microcontrollers

V850ES/JG3-L
CHAPTER 19 I²C BUS
19.14.2 When communication reservation function is disabled (IICFn.IICRSVn bit = 1)
If the IICCn.STTn bit is set when the bus is not being used by the V850ES/JG3-L in a bus communication, this
request is rejected and a start condition is not generated. There are two modes in which the bus is not used by the
V850ES/JG3-L.
• When arbitration results in the V850ES/JG3-L being neither the master nor a slave
• 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 19-7 is required until the STCFn flag is set after setting the STTn bit to 1. Therefore, secure the
time by software.
OCKSENm
1
1
1
1
0
OCKSm1
0
0
1
1
0
Table 19-7. Wait Periods
OCKSm0
0
1
0
1
0
CLn1
0
0
0
0
1
CLn0
×
×
×
×
0
Wait Period
10 clocks
15 clocks
20 clocks
25 clocks
5 clocks
Remarks 1. ×: don’t care
2. n = 0 to 2
m = 0, 1
R01UH0165EJ0700 Rev.7.00
Sep 22, 2011
Page 743 of 1113