/usr/share/doc/HOWTO/ja-html/Modem-HOWTO-15.html

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<H2><A NAME="uart_"></A> <A NAME="s15">15.</A> <A HREF="Modem-HOWTO.html#toc15">UART $B$C$F2?$G$9$+(B? $B@-G=$K$I$s$J1F6A$rM?$($^$9$+(B? </A></H2>

<H2><A NAME="ss15.1">15.1</A> <A HREF="Modem-HOWTO.html#toc15.1">UART $B$N35MW(B</A>
</H2>

<P> ($B$3$N@a$O(B Serial-HOWTO $B$K$b$"$j$^$9(B)</P>

<P>UART (<B>U</B>niversal <B>A</B>synchronous <B>R</B>eceiver <B>T</B>ransmitter) 
$B$H$O!"(BPC $B$N%^%6!<%\!<%I(B($B$"$k$$$OFbB"%b%G%`%\!<%I(B)$B$K:\$C$F$$$k%7%j%"%k(B
$BMQ%A%C%W$N$3$H$G$9!#B>$NMQES$N%A%C%W$,7sMQ$G(B UART $B$N5!G=$r<B8=$7$F$$(B 
$B$k$3$H$b$"$j$^$9!#B?$/$N(B 486 $B%^%7%s$N$h$&$J8E$$%3%s%T%e!<%?$G$O!"$3$N(B 
$B%A%C%W$O%G%#%9%/(B I/O $B%3%s%H%m!<%i%\!<%I$K:\$C$F$$$^$7$?!#Hf3SE*8E$$%3(B 
$B%s%T%e!<%?$NCf$K$O!"$^$@@lMQ$N%7%j%"%k%\!<%I$r:\$;$F$$$k$b$N$b$"$j$^$9!#(B</P>

<P>UART $B$NL\E*$O(B PC $B$N%Q%i%l%k%P%9$+$i$d$C$F$/$k%P%$%H%G!<%?$r!"%7%j%"%k$N(B
$B%S%C%H%9%H%j!<%`$KJQ49$9$k$3$H$G$9!#%7%j%"%k%]!<%H$+$i=P$F$$$k%1!<%V%k(B
$B$O%G!<%?$r%7%j%"%k$KAw$k$h$&$K$J$C$F$*$j!"%G!<%?$,N.$l$kJ}8~$=$l$>$l(B
$B$K$D$$$F(B 1 $B$D$7$+@~$,$"$j$^$;$s!#%7%j%"%k%]!<%H$O0lEY$K(B 1 $B%S%C%H$:$D(B
$B%S%C%H%9%H%j!<%`$rAw$j$^$9!#5U$K!"30IU$1%1!<%V%k$r7PM3$7$F%7%j%"%k%]!<(B
$B%H$KF~$C$F$-$?%S%C%H%9%H%j!<%`$O!"%3%s%T%e!<%?$,=hM}$G$-$k%Q%i%l%k$J(B
$B%P%$%H%G!<%?$KJQ49$5$l$^$9!#(BUART $B$O%G!<%?$r%P%$%HC10L$G07$$$^$9!#$3$N(B
$BC10L$OET9g$,$$$$$3$H$K(B ASCII $BJ8;z$NBg$-$5$G$b$"$j$^$9!#(B</P>

<P>PC $B$K$V$i2<$,$C$F$$$kC<Kv$,$"$k$b$N$H$7$^$9!#%f!<%6$,J8;z$rF~NO$9$k$H!"(B
$BC<Kv$O$=$NJ8;z$r%H%i%s%9%_%C%?$K(B (UART $B$K$b(B)$BAw$j$^$9!#%H%i%s%9%_%C%?$O(B
$B$=$N%P%$%H%G!<%?$r%7%j%"%k2s@~$KAw$j!"Aw?.$O(B 1 $B%P%$%H$:$D!"FCDj$NB.EY(B
$B$G9T$$$^$9!#(BPC $BB&$G$O!"<u?.$r9T$&(B UART $B$,%S%C%HNs$rA4$F<u$1<h$j!"(B($B%Q%i(B
$B%l%k$N(B)$B%P%$%H%G!<%?$KI|85$7!"$3$l$r%P%C%U%!$KF~$l$^$9!#(B</P>

<P>$B%7%j%"%k$H%Q%i%l%k$NJQ49$K2C$($F!"(BUART $B$O<g$J=hM}$NI{;:J*(B($BI{:nMQ(B)$B$H$7(B 
$B$FB>$N=hM}$b$$$/$D$+9T$$$^$9!#%S%C%HNs$rI=$9$?$a$K;H$&EE05$bJQ49(B($BJQ99(B) 
$B$7$^$9!#%P%$%H%G!<%?$rAw?.$9$kA0$K!"$=$l$>$l$N%P%$%H$KBP$7$FDI2C$N%S%C(B
$B%H(B($B$$$o$f$k%9%?!<%H%S%C%H$H%9%H%C%W%S%C%H(B)$B$r2C$($^$9!#>\$7$/$O(B 
Serial-HOWTO $B$N!VEE05$NGH7A!W$N@a$r8+$F$/$@$5$$!#$^$?!"%3%s%T%e!<%?Fb(B
$BIt$N%Q%i%l%k%P%9>e$N%U%m!<%l!<%H(B($B%P%$%H(B/$BIC(B)$B$O(B $BHs>o$K9b$/!"%7%j%"%k%]!<(B
$B%HB&$N(B UART $B$+$i=P$k%U%m!<%l!<%H$O$3$l$h$j$b$:$C$HCY$$$G$9!#(BUART $B$O$$(B
$B$/$D$+$N7h$a$i$l$?%U%m!<%l!<%H(B($BB.EY(B)$B$NAH$r;}$C$F$$$F!"$3$l$r%7%j%"%k%]!<(B
$B%H%$%s%?%U%'!<%9$G;H$&$3$H$,$G$-$^$9!#(B</P>
<P>[ $BLuCm(B : JF $B%W%m%8%'%/%H$K$h$kF|K\8lLu(B 
<A HREF="http://www.linux.or.jp/JF/JFdocs/Serial-HOWTO.html">Serial-HOWTO</A> ]</P>


<H2><A NAME="ss15.2">15.2</A> <A HREF="Modem-HOWTO.html#toc15.2">2 $B<oN`$N(B UART</A>
</H2>

<P> UART $B$N4pK\E*$J<oN`$O(B 2 $B$D(B($B%@%`(B UART $B$H(B FIFO UART) $B$"$j$^$9!#%@%`(B 
UART $B$O(B 8250, 16450, $B=i4|7?(B 16550, $B=i4|7?(B 16650 $B$G$9!#$3$l$i$O;~BeCY$l(B 
$B$N$b$N$G$9$,!"$3$l$i$NF0:n$N;EAH$_$,$o$+$l$P!"(BFIFO UART ($B:G6a$N(B 16550,
16550A, 16c552, $B:G6a$N(B 16650, 16750, 16950) $B$NF0:n$rM}2r$9$k$N$bMF0W$G(B 
$B$9!#(B</P>

<P>16550 $B$K$D$$$F$OJ6$i$o$7$$E@$,$$$/$D$+$"$j$^$9!#=i4|%b%G%k$K$O%P%0$,$"(B
$B$j!"(B(FIFO $B$r;}$?$J$$(B) 16450 $B$H$7$F$7$+@5$7$/F0:n$7$^$;$s!#%P%0$,=$@5$5(B
$B$l$?:G6a$N%b%G%k$K$O(B 16550A $B$H$$$&L>A0$,IU$$$F$$$^$9$,!"B?$/$N%a!<%+!<(B
$B$OL>A0$rJQ99$7$F$*$i$:!"(B16550 $B$H8F$SB3$1$F$$$^$9!#8=:_;H$o$l$F$$$k(B
16550 $B$NBgItJ,$O(B 16550 $B$N$h$&$G$9!#%O!<%I%&%'%"$N%^%K%e%"%k$K(B 16550 $B$G(B
$B$"$k$H=q$+$l$F$$$F$b(B($B$"$k$$$O%i%Y%k$K$=$N$h$&$K9o0u$5$l$F$$$F$b(B)$B!"(B
Linux $B$O(B 16550A $B$G$"$k$HG'<1$7$F$/$l$^$9!#F1MM$N;v>p$,(B 16650 $B$K$b$"$j(B
$B$^$9(B($B$3$A$i$NJ}$,?<9o$G$9!#$H$$$&$N$b!"J9$$$?OC$G$O%a!<%+!<$,%P%0$rG'(B
$B$a$J$+$C$?$+$i$G$9(B)$B!#(BLinux $B$O:G6a$N(B 16650 $B$r(B 16650V2 $B$H$7$FG'<1$7$^$9!#(B
16650 $B$HG'<1$5$l$?>l9g$K$O;DG0$J$,$i!"(B1 $B%P%$%H$N%P%C%U%!$7$+;}$C$F$$(B
$B$J$$$h$&$KF0:n$7$^$9!#(B</P>


<H2><A NAME="fifo_"></A> <A NAME="ss15.3">15.3</A> <A HREF="Modem-HOWTO.html#toc15.3">FIFO </A>
</H2>

<P> $B%@%`$H(B FIFO ($B%-%e!<$NF0:n$,%U%!!<%9%H%$%s!&%U%!!<%9%H%"%&%H(B (First
In, First Out) $B$G$"$k(B)$B$N0c$$$r@bL@$9$k$?$a$K!"$^$:$O(B UART $B$,(B 1 $B%P%$%H(B
$B$N%G!<%?$rAw<u?.$7$?>l9g$N$3$H$rD4$Y$F$_$^$7$g$&!#(BUART $BK\BN$O<+J,$rDL(B
$B$k%G!<%?$K4X$7$F$O2?$b9T$o$:!"C1$K%G!<%?$rAw<u?.$9$k$@$1$G$9!#85!9$N%@(B
$B%`(B UART $B$N>l9g$O!"%P%$%H%G!<%?$,Aw<u?.$5$l$kEY$K(B CPU $B$,%7%j%"%k%G%P%$(B
$B%9$+$i3d9~$_$r<u$1<h$j$^$9!#(BCPU $B$O$3$l$r<u$1$F!"<u?.$7$?%P%$%H%G!<%?(B
$B$r(B UART $B$N%P%C%U%!$+$i<h$j=P$7$F%a%b%j>e$N$I$3$+$KCV$/$+!"Aw?.$9$Y$-<!(B
$B$N%P%$%H%G!<%?$r(B UART $B$KEO$9$+$N!"$I$A$i$+F0:n$r9T$$$^$9!#(B8250 $B$H(B 
16450 UART $B$K$O(B 1 $B%P%$%H$7$+%P%C%U%!$,$"$j$^$;$s!#$D$^$j!"(B1 $B%P%$%H$N%G!<(B
$B%?$rAw<u?.$9$kEY$K(B CPU $B$K3d9~$_$,$+$+$j$^$9!#E>AwB.EY$,Dc$1$l$P$3$l(B
$B$G$bBg>fIW$G$9!#$7$+$7!"E>AwB.EY$,9bB.$G$"$k>l9g$K$O!"(BUART $B$N=hM}$NIi(B
$B2Y$,(B CPU $B$K$+$+$j$9$.$k$?$a!"B>$N=hM}$r$&$^$/9T$($k$@$1$N;~4V$,$J$/$J$C(B
$B$F$7$^$$$^$9!#>l9g$K$h$C$F$O!"(BCPU $B$N3d9~$_=hM}$,4V$K9g$o$J$/$J$C$F$7(B
$B$^$$!"%P%$%H%G!<%?$,>e=q$-$5$l$F$7$^$$$^$9!#$J$<$J$i!"%G!<%?$,F~$C$F$/(B
$B$k$N$,B.2a$.$k$+$i$G$9!#$3$l$O!V%*!<%P!<%i%s(B (overrun)$B!W$"$k$$$O!V%*!<(B
$B%P!<%U%m!<(B (overflow)$B!W$H8F$P$l$^$9!#(B</P>

<P>$B$3$l$,(B FIFO UART $B$,LrN)$DM}M3$G$9!#(B16550A ($B$"$k$$$O(B 16550) $B$N(B FIFO $B%A%C(B
$B%W$K$O(B 16 $B%P%$%H$N(B FIFO $B%P%C%U%!$,IU$$$F$$$^$9!#$D$^$j!"(BCPU $B$K3d9~$_(B
$B$,$+$+$k$^$G$K(B 16 $B%P%$%H$^$G$r<u$1<h$k(B($BAw$k(B)$B$3$H$,$G$-$k$N$G$9!#$?$/$5(B
$B$s$N%P%$%H%G!<%?$rBT$D$3$H$,$G$-$k$@$1$G$O$J$/!"(BCPU $B$O(B 14 $B%P%$%H(B($B$^$?(B
$B$O$=$l0J>e(B)$B$N%P%$%H%G!<%?$rF1;~$KE>Aw$G$-$^$9!#$3$l$O!"%P%C%U%!$r(B 1 $B%P(B
$B%$%H$7$+;}$C$F$$$J$$B>$N(B UART $B$KBP$7$FFC$KM%$l$F$$$kE@$G$9!#(BCPU $B$,<u$1(B
$B$k3d9~$_$b>/$J$/B>$N=hM}$K2s$;$^$9$7!"%G!<%?$,$J$/$J$k$3$H$b$J$/3'9,(B
$B$;$K$J$l$^$9!#(BFIFO $B%P%C%U%!$N3d9~$_$NogCM(B($B%H%j%,%l%Y%k(B)$B$K$O(B 14 $B0J2<(B
$B$NCM$,@_Dj$G$-$kE@$KCm0U$7$F$/$@$5$$!#$3$NB>$K$O(B 1, 4, 8 $B$,A*$Y$^$9!#(B</P>

<P>$BBgDq$N(B PC $B$K$O(B 16 $B%P%$%H$N%P%C%U%!$r;}$D(B 16550 $B$7$+IU$$$F$$$^$;$s$,!"(B
$B9b5i$J(B UART $B$K$O$b$C$HBg$-$J%P%C%U%!$,$"$j$^$9!#3d9~$_$O%P%C%U%!$,$$$C(B
$B$Q$$$K$J$kD>A0(B (16 $B%P%$%H$N%P%C%U%!$G$O(B 14 $B%P%$%H$N$$$o$f$k!V%H%j%,%l(B
$B%Y%k!W$N;~E@(B)$B$KH/9T$5$l$kE@$KCm0U$7$F$/$@$5$$!#$3$&$9$k$3$H$K$h$j!"3d(B
$B9~$_%5!<%S%9$,<B9T$5$l$k4V$K$b2?%P%$%H$+$N%G!<%?$r<u$1<h$l$kM>M5$,;D$j(B
$B$^$9!#$3$N%H%j%,%l%Y%k$K$O!"%+!<%M%k$N%=%U%H%&%'%"$,5v2D$7$??'!9$JCM$r(B
$B@_Dj$9$k$3$H$,$G$-$^$9!#%H%j%,%l%Y%k$r(B 1 $B$K$9$k$H!"%@%`(B UART $B$H$[$\F1(B
$BEy$K$J$j$^$9(B ($B$?$@$7!"3d9~$_$rH/9T$7$?8e$K$b$5$i$K(B 15 $B%P%$%H$r<u$1<h$k(B
$B6u$-$,;D$C$F$$$kE@$,0[$J$j$^$9(B)$B!#(B</P>

<P>BBS $B$KF~$C$F$$$k$H$-$K2?$+J8;z$rF~NO$7$?>l9g!"F~NO$7$?J8;z$O%7%j%"%k%]!<(B
$B%H7PM3$GAw$j=P$5$l$^$9!#F~NO$7$?J8;z$,2hLL$KI=<($5$l$k$N$O!"$=$NJ8;z$,(B
$BEEOC2s@~!&%b%G%`!&%7%j%"%k%]!<%H7PM3$G2hLL$K%(%3!<%P%C%/$5$l$F$$$k$+$i(B
$B$G$9!#%7%j%"%k%]!<%H$K(B 16 $B%P%$%H$N%P%C%U%!$,IU$$$F$$$k>l9g(B($B$3$l$O(B 14 
$B%P%$%H=8$^$k$^$GJ8;z$rAw$C$F$/$l$^$;$s(B)$B!"F~NO$7$?J8;z$,I=<($5$l$k$^$G(B
$B$K$OJ8;z$r$?$/$5$sF~NO$7$J$1$l$P$J$i$J$$$G$7$g$&!#$H$F$bJ6$i$o$7$$$N$G(B
$B$9$,!"$3$l$rKI$0$?$a$N!V%?%$%`%"%&%H!W$,$"$j$^$9!#=>$C$F!"IaDL$OJ8;z$r(B
$BF~NO$9$k$H!"$=$NJ8;z$O$9$0$K2hLL$KI=<($5$l$^$9!#(B</P>

<P>UART $B$N<u?.%P%C%U%!$N>l9g!"$3$N!V%?%$%`%"%&%H!W$O(B $B0J2<$N$h$&$KF0:n$7$^(B
$B$9(B : $BJ8;z$,<!!9$H$d$C$F$-$F$b!"3d9~$_$OH/9T$5$l$k$N$O!"%P%C%U%!$KNc$((B
$B$P(B 14 $B8DJ8;z$,$?$^$C$?$H$-$@$1$G$9!#$7$+$7!"$"$kJ8;z$,FO$$$?8e$K$7$P$i$/(B
$B<!$NJ8;z$,FO$+$J$/$F$b3d9~$_$,H/9T$5$l$^$9!#$3$N3d9~$_$O$?$H$(%P%C(B
$B%U%!$K(B 14 $B8DJ8;z$,F~$C$F$$$J$/$F$bH/9T$5$l$^$9(B (1 $BJ8;z$G$bF~$C$F$$$l$P(B
$BH/9T$5$l$^$9(B)$B!#$7$?$,$C$F!"$3$N%P%C%U%!$rDL$7$FJ8;z$rF~NO$9$k$H!"%P%C(B
$B%U%!$NBg$-$5$,<B:]$K$O(B 16 $B%P%$%H$G$"$C$F$b(B($B$"$J$?$,J8;z$rBG$A9~$`B.$5(B
$B$,IaDL$N(B 100 $BG\$G$J$1$l$P(B) 1 $B%P%$%H$N%P%C%U%!$N$h$&$KF0:n$7$^$9!#F1MM(B
$B$N!V%?%$%`%"%&%H!W$,Aw?.%P%C%U%!$K$b$"$j$^$9!#(B</P>


<H2><A NAME="ss15.4">15.4</A> <A HREF="Modem-HOWTO.html#toc15.4">UART $B$N%b%G%kHV9f(B</A>
</H2>

<P> $B0J2<$N(B UART $B$N0lMw$r<($7$^$9!#(B<EM>TL</EM> $B$O%H%j%,%l%Y%k(B(<EM>T</EM>rigger
<EM>L</EM>evel) $B$G$9!#(B</P>
<P>
<UL>
<LI> 8250, 16450, $B=i4|$N(B 16550: $B%P%C%U%!$NBg$-$5$,(B 1 $B%P%$%H$G$"$k;~BeCY$l$N(B UART $B$G$9(B</LI>
<LI> 16550, 16550A, 16c552: 16 $B%P%$%H$N%P%C%U%!$,$"$j$^$9(B (TL=1,4,8,14)</LI>
<LI> 16650: 32 $B%P%$%H$N%P%C%U%!$,$"$j$^$9!#(B460.8 Kbps $B$^$G$NB.EY$KBP(B
$B1~$7$F$$$^$9(B</LI>
<LI> 16750: 16750: 64 $B%P%$%H$NAw?.%P%C%U%!!"(B56 $B%P%$%H$N<u?.%P%C%U%!(B
$B$,$"$j(B $B$^$9!#(B921.6 kbps $B$^$G$NB.EY$KBP1~$7$F$$$^$9(B</LI>
<LI> Hayes ESP: 1K $B%P%$%H$N%P%C%U%!$,$"$j$^$9(B</LI>
</UL>
</P>

<P>$B;~BeCY$l$N(B UART $B$,$&$^$/F0:n$9$k$N$O(B 14.4k $B$h$jCY$$%b%G%`(B (DTE $BB.EY$O(B 
38400 bps $B$^$G(B)$B$N>l9g$@$1$G$9!#:G6a$N%b%G%`$G$O!">/$J$/$H$b(B 16550 ($B=i(B
$B4|7?(B 16550 $B$O4^$_$^$;$s(B)$B$,I,MW$G$9!#(BV.90 $B5,3J$N(B 56k $B%b%G%`$N>l9g$K(B $B$O!"(B
16650 $B$r;H$&$H?t%Q!<%;%s%HB.$/$J$k$3$H$,$"$j$^$9(B($BFC$K05=L$5$l$F$$$J$$(B
$B%U%!%$%k$r%@%&%s%m!<%I$9$k$H$-(B)$B!#(B16650 $B$r;H$&<g$JMxE@$O%P%C%U%!$N%5%$%:(B
$B$,Bg$-$$$3$H$G$"$j!"%b%G%`$N05=LHf$,9b$/$J$1$l$PI,MW0J>e$NB.EY$,I,MW(B
$B$J$$E@$G$9!#0lIt$N(B 56k $BFbB"%b%G%`$K$O(B 16650 $B$,:\$C$F$$$J$$$b$N$,$"$j(B
$B$^$9(B($BI.<T$O3N$+$a$F$$$^$;$s(B)$B!#(B</P>

<P>UART $B$G$J$/%$%s%F%j%8%'%s%H$J%^%k%A%]!<%H%\!<%I$G$O!"(BDSP $B%A%C%W$r;H$C(B
$B$F$5$i$J$k%P%C%U%!%j%s%0$H@)8f$r9T$C$F$$$^$9!#$7$?$,$C$F!"(BCPU $B$NIi2Y$O(B
$B$5$i$K7Z$/$J$C$F$$$^$9!#Nc$($P!"(BCyclades $B<R@=$N(B Cyclom $B$d(B Stallion $B<R(B
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