????????????
??????(Boud Rate)?????????????????????????λ??(bits/second)??MCS-51???ж????????????????в???????????????????У???0????2???????????;??1????3????????????????????????????1????????????????????????
????ж?????????1?????????????/??????1???????????????????????????2(????????)?????????????????????
??????=(1+SMOD)*???????/(384*(256-TH1))
???У?SMOD——?????PCON???7λ??????????????λ;
TH1——??????????????
?????????????????????????????????????????????????????????????????????????Χ???????????????䶮???????????????????????????????????????к?????????????????????????????????????С????????????
???????????????????????
??????????????????20000bit/s?????????????12MHz??????SMOD=1(???????????)????
TH1=256-62500/??????
????????????????????????????????????У?1200??2400??4800??9600??19200???м?????????????????????±???
| ?????? | ??????????? | ????????? |
| 1200 | 204 | 0.16% |
| 2400 | 230 | 0.16% |
| 4800 | 243 | 0.16% |
| 9600 | 249 | 6.99% |
| 19200 | 253 | 8.51% |
??????????У??????ò??????1200??2400??4800?е??????
????admin ?????????2018-05-18
