UHCI Escapes Sequence Configuration Register3
ESC_SEQ2 | Configures the char needing encoding, which is 0x13 as flow control char by default. |
ESC_SEQ2_CHAR0 | Configures the first char of SLIP escape character, default value is 0xDB. |
ESC_SEQ2_CHAR1 | Configures the second char of SLIP escape character, default value is 0xDF. |