Renesas Hitachi H8S/2194 Series Hardware Manual page 593

In order to avoid these troubles, the following procedures must be observed in initialization of
2
I C.
(1) Implement initialization of internal state by setting IICRST bit or ICE bit.
(2) Execute the stop condition issue instruction (setting BBSY = 0 and SCP = 0 to write) and
wait for a duration equivalent to 2 clocks of the transfer rate.
(3) Execute initialization of internal state again by setting IICRST bit or ICE bit.
2
(4) Initialize each I C register (re-setting).
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