NEC 78K0R/KE3 User Manual page 466

Here is an example of setting an IIC transfer rate where MCK = f
IIC Transfer Mode
(Desired Transfer Rate)
100 kHz
400 kHz
466
CHAPTER 11 SERIAL ARRAY UNIT
Operation Clock (MCK) SDR02[15:9]
f 99
CLK
f 24
CLK
User's Manual U17854EJ9V0UD
= 20 MHz.
CLK
f = 20 MHz
CLK
Calculated Error from Desired Transfer
Transfer Rate
100 kHz 0.0%
400 kHz 0.0%
Rate