Transmission setting
| SDA_FORCE_OUT | SDA output mode. 0: open drain. 1: push pull. |
| SCL_FORCE_OUT | SCL output mode. 0: open drain. 1: push pull. |
| MS_MODE | Set this bit to configure RTC I²C as a master. |
| TRANS_START | Set this bit to 1, RTC I2C starts sending data. |
| TX_LSB_FIRST | This bit is used to control the sending mode. 0: send data from the most significant bit. 1: send data from the least significant bit. |
| RX_LSB_FIRST | This bit is used to control the storage mode for received data. 0: receive data from the most significant bit. 1: receive data from the least significant bit. |
| CLK_GATE_EN | RTC I²C controller clock gate. |
| RESET | RTC I²C software reset. |
| CLK_EN | rtc i2c reg clk gating |