Sony CXD5602 User Manual page 253

3.9.4.6 Clock Control from Internal Sequencers
To reduce power consumption, the firmware of the internal sequencers attempts to stop as many as clocks as
possible during Sleep. Also, since SPI, I2C0, and I2C1 are master devices, each of their clocks are controlled by
the internal sequencers so they operate only during data transfer (Table SCU (Sensor Control Unit)-94). The
CK_SCU_32K and CK_SCU_SCU_SC clocks are required for operation of the internal sequencers but since they
are not controlled by the internal sequencers, they must be turned ON from the CPU for operation of the SCU.
Table SCU (Sensor Control Unit)-86 Clock Control from the Internal Sequencers
SCU Clock Name
CK_SCU_SCU
CK_SCU_SCU_SC
CK_SCU_SCU_SPI
CK_SCU_SCU_I2C0
CK_SCU_SCU_I2C1
CK_SCU_SCU_SEQ
CK_SCU_32K
3.9.4.7 Clock Control from CPU
When viewed from the SYSCPU, the ON/OFF control of the internal sequencer clocks change automatically
during the operation of the internal sequencers. During the operation of the internal sequencers, ON/OFF
switching of the internal sequencer clocks cannot be controlled by the SYSCPU, and is automatically performed.
The CPU must supply the clocks so that the ON/OFF control of internal sequencer clocks can be properly
performed (Table SCU (Sensor Control Unit)-95).
During Internal Sequencer
Sleep
OFF
Not controlled
OFF
OFF
OFF
OFF
Not controlled
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During Internal Sequencer Active
ON
ON only during SPI transfer, OFF all other times
ON only during I2C0 transfer, OFF all other times
ON only during I2C1 transfer, OFF all other times
ON
CXD5602 User Manual