RX_IDLE_THRHD | when receiver takes more time than this register value to receive a byte data. it will produce frame end signal for uhci to stop receiving data. |
TX_IDLE_NUM | This register is used to configure the duration time between transfers. |
TX_BRK_NUM | This register is used to configure the num of 0 send after the process of sending data is done. it is active when txd_brk is set to 1. |