rtc configure register
| SWD_RESET_FLAG | swd reset flag |
| SWD_FEED_INT | swd interrupt for feeding |
| SWD_BYPASS_RST | Bypass swd rst |
| SWD_SIGNAL_WIDTH | adjust signal width send to swd |
| SWD_RST_FLAG_CLR | reset swd reset flag |
| SWD_FEED | Sw feed swd |
| SWD_DISABLE | disabel SWD |
| SWD_AUTO_FEED_EN | automatically feed swd when int comes |