UHCI Escapes Sequence Configuration Register1
ESC_SEQ0 | Configures the char needing encoding, which is 0xDB as flow control char by default. |
ESC_SEQ0_CHAR0 | Configures the first char of SLIP escape character, default value is 0xDB. |
ESC_SEQ0_CHAR1 | Configures the second char of SLIP escape character, default value is 0xDD. |