UART sleep configure register 2
| ACTIVE_THRESHOLD | The uart is activated from light sleeping mode when the input rxd edge changes more times than this register value. |
| RX_WAKE_UP_THRHD | In wake up mode 1 this field is used to set the received data number threshold to wake up chip. |
| WK_CHAR_NUM | This register is used to select number of wake up char. |
| WK_CHAR_MASK | This register is used to mask wake up char. |
| WK_MODE_SEL | This register is used to select wake up mode. 0: RXD toggling to wake up. 1: received data number larger than |