1、1|忄卜T9!4H(0o n o v|1o Lt0|r“】卩E阝T卩p 卩=I!l HE M点机9l Fm t l q Ti f 卩:ET丿汇=H1 NT卩i Ni|=|1|:1:t G卩VD 1Tr 凵B0卩刚EF Lx TE”01t a b Ie 1,Pu Up a n d LED Dr i Ve Re s i s t o r sPARtR1(亠)R2(l)R3(2)R4(!)R5(J)R6l 2)MAX|400A20o200104:o)(a201,MA1480B200丐103(j()022003i Df)()200MA14a 0C2002003()o3(C0:0)i 2|(!2.2.3R
2、s 232接旦采用 砂J32实现Tt L电平到Rs 232接电平的转换 去r 典I!电路如 卜 图:2.3.2波特率由BRL重胃值 BDRc 0N寄存器的s P。位和PCo N寄存器的s M。D1位i J k 定算公式如 卜:Ba 11d Rm e=2s MD1X FPER6 1s PDl X32256-(BRL)J(BRL)=256-2s MD1FPER6s PD 32X Ba u d Ra t eUs e s e r i a 1 Po r t Mo d e 3;s MO=1 s M1=1氵To s e t s MO C1e a r s M0D0 n p c 0N r e g i s t e
3、 rEn a b e m L1 土p r o c e s s o r Co In u n c a t 土o n:s M2=1串口中断发生时 检查s Bu F(99h)是否为39h 若是 清s M2 按收 卜 面的39个字节 否则忽略EXa m p l e f c o m p u t 合d v a l u e w h e n X2=,s MOD】=1,$PD=1Bt n u d Ra$F$GA=1心,各勘各s Hz罗。s GA玄24,f l i zBRL琶r r o r(q。)8REr r 0叫%1152002471232435 60020812323l l01F,38400匚一123217o 162880000亠123204016i 920勹一Jb0178960l l149031f.l G480043123