Espressif ESP32 Technical Reference Manual page 684

30 ULP Coprocessor (ULP)
31
0 0 0 0 0 0 0
RTC_I2C_SCL_LOW_PERIOD Number of RTC_FAST_CLK cycles when SCL == 0. (R/W)
31
0 0 0 0 0 0 0
RTC_I2C_RX_LSB_FIRST Receive LSB first. (R/W)
RTC_I2C_TX_LSB_FIRST Send LSB first. (R/W)
RTC_I2C_TRANS_START Force to generate a start condition. (R/W)
RTC_I2C_MS_MODE Master (1), or slave (0). (R/W)
RTC_I2C_SCL_FORCE_OUT SCL is push-pull (1) or open-drain (0). (R/W)
RTC_I2C_SDA_FORCE_OUT SDA is push-pull (1) or open-drain (0). (R/W)
Espressif Systems
Register 30.8. RTC_I2C_SCL_LOW_PERIOD_REG (0x000)
19 18
0 0 0 0 0 0 0 0
Register 30.9. RTC_I2C_CTRL_REG (0x004)
0 0 0 0 0 0 0 0
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0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
684
0 0 0 0 0 0 0 0
8 7 6 5 4 3 2 1
0 0 0 0 0 0 0 0
ESP32 TRM (Version 5.2)
0
0 Reset
0
0
Reset