SCCB:
a. 写操作，三个阶段：ID Address、Sub-address、Write Data
b. 读操作，2阶段的写+2阶段的读
I2C:
a. 写操作
b.
参考文档：
1. OmniVision Serial Camera Control Bus (SCCB) Functional Specification
2. I2C-bus specification and user manual Application
3. TW2867 4-Channel Video Decoders and Audio Codecs For Security