Sony CXD5602 User Manual page 219

3.7.4.3 Clock Supply Start and Stop
3.7.4.3.1 Clock Supply Start
The following describes the method to start clock supply to the I2C4.
1. Clock supply start (internal circuit initialization).
PMU_CORE_CKEN.RTC_PCLK = 1'b1
PMU_CORE_CKEN.PMU_RTC_PCLK = 1'b1
Reads the address 0x04106000 of I2C4 (dummy read to wait for completion of preceding setting)
2. Clock stop
PMU_CORE_CKEN.RTC_PCLK = 1'b0
PMU_CORE_CKEN.PMU_RTC_PCLK = 1'b0
Reads the address 0x04106000 of I2C4 (dummy read to wait for completion of preceding setting)
3. Reset release
SWRESET_BUS.XRST_PMU_I2CM = 1'b1
4. Clock supply start
PMU_CORE_CKEN.RTC_PCLK = 1'b1
PMU_CORE_CKEN.PMU_RTC_PCLK = 1'b1
3.7.4.3.2 Clock Supply Stop
The following describes the method to stop the clock supply to the I2C4.
1. Clock stop
PMU_CORE_CKEN.RTC_PCLK = 1'b0
PMU_CORE_CKEN.PMU_RTC_PCLK = 1'b0
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CXD5602 User Manual