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Date: Mon, 19 Aug 1996 01:41:06 +0800
From: Mitsuru IWASAKI <iwasaki@pc.jaring.my>
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Subject: [doc-jp 388] Few more questions on uart.sgml
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$B4wOA:754(B@$B$?$^$K$OK=AvB2$U$&(B $B$$$o$5$-$G$9!#(B

$BFb@n$5$s!"@u8+$5$s$N$*=u$1$K$h$j!"(Buart.sgml$B$N8eH>$O$[$\40@.$H$J$j$^$7$?!#(B
# $BL5M}LpM}$7$^$7$?(B :-)

$B!V(Berattas$B!W$O!V(Berraras$B!W$N(Btypo$B$H2r<a$7!"<h$j4:$($:!V@58mI=!W$H$7$F$*$-$^$9!#(B
$B$$$$Lu0F$,;W$$$D$$$?$i$*CN$i$;$7$FD:$1$l$P9,$$$G$9!#(B

# $B$=$&$$$dA0$N%a!<%k$N%5%V%8%'%/%H$r!V(B[Q] What's ``erarras'' in uart.sgml$B!W(B
# $B$C$F$7$A$c$C$?(B(^^;)$B!#(Btypo$B<h$j$,(Btypo$B$K$J$C$?(B...   ^^^^^^^

$B$*Fs?M$+$i8f;XE&$N$"$C$?!V%J%7%g%J%k!W$OA42U=j!V%J%7%g%J%k!&%;%_%3%s%@%/%?!W(B
$B$H$7$^$7$?!#A0$NJ}$G>JN,$J$7$G5-=R$7$F$"$C$?$s$G!"$3$NItJ,$O$^$"(BOK$B$+$J$H(B
$B;W$C$F$?$s$G$9$,!"8m2r$r>7$/$*$=$l$,$"$k$N$GD>$7$^$7$?!#(B

$B$=$l$G!"%5%V%8%'%/%H$K$"$k$h$&$K:G8e$A$g$C$H$@$1J,$+$i$J$$$H$3$m$,;D$C$F$^$9!#(B
$B$?$9$1$F!<!<!<(B!!

(1) bin$B$C$F$J$"$K(B?
$B86J8(B:
	It is important to understand that in some stores, you may pay
	&dollar;15(US) for a NS16550AFN made in 1990 and in the next bin are the
	new PC16550DN parts with minor fixes that National has made since the
	AFN part was in production, the PC16550DN was probably made in the
	past six months and it costs half (as low as &dollar;5(US) in volume) as
	much as the NS16550AFN because they are readily available.

$BLuJ8(B:
	$B<!$N$3$H$rM}2r$7$F$$$k$3$H$,=EMW$G$9!#$"$k$*E9$G$O(B1990$BG/$K@=B$$5(B
	$B$l$?(B NS16550AFN $B$O(B&dollar;15 (US) $B0L$9$k$G$7$g$&!#<!$N(Bbin$B$K@=B$(B
	$B$5$l$?$b$N$O(B AFN $BItIJ$,@=B$Cf$K$J$C$F$+$i%J%7%g%J%k!&%;%_%3%s%@(B
	$B%/%?$,;\$7$?%^%$%J!<%U%#%C%/%9$,$J$5$l$??7$7$$(B PC16550DN $B$NItIJ(B
	$B$G$9!#(BPC16550DN $B$OB?J,2a5n(B6$B%v7n$K@=B$$5$l$?$b$N$G$"$j!"4JC1$KF~(B
	$B<j$G$-$k$?$a(B NS16550AFN $B$NH>3[DxEY(B(&dollar;5 (US) $B0L$N0B$5(B)$B$G$7$g(B
	$B$&!#(B

$B86J8(B2$B9TL\$N(B``in the next bin''$B$J$s$G$9$,!"$J$s$J$s$G$7$g$&(B? 
$B;d$N4*$O!V<!$NH>G/$8$c$"!W$H:,5r$b$J$/8@$C$H$k$s$G$9$+(B...
$B$^$?!"$3$NCJMn$O%$%^%$%A<+?.$,$J$$$N$GA4J8$N$;$F$*$j$^$9!#(B
$B$*$+$7$J$H$3$m$,$"$C$?$i!"$^$?$b$C$HNI$$Lu$,$"$l$P$*4j$$$7$^$9!#(B

(2) QFP? DIP? LPCC? $B$X$C(B?
$B86J8(B:
	"F"	QFP	(quad flat pack) L lead type
	"N"	DIP	(dual inline package) through hole straight lead type
	"V"	LPCC	(lead plastic chip carrier) J lead type

$BLuJ8(B:
	$B$J$7(B

$B$o$C$+$i!<!<$s!#$3$l$O%J%7%g%J%k!&%;%_%3%s%@%/%?$NItIJHV9f$K$D$$$F$N(B
$B@bL@$K$G$F$/$k!"%Q%C%1!<%8%?%$%W$N0lMw$G$9!#EvJ}!"H>F3BN%A%C%W$K$D$$$F$O(B
$B$"$^$jL@$k$/$J$$$N$G$*<j>e$2$G$9!#(B
$BFC$K3g8LFb$H(B``through hole straight lead type''$B$NItJ,$G$9!#(B

(3) ``be divided from''$B$H$O(B
$B86J8(B:
	This value will be divided from the master
	input clock (in the IBM PC, the master
	clock is 1.8432MHz) and the resulting clock
	will determine the baud rate of the UART.
	This register holds bits 0 thru 7 of the
	divisor.

$BLuJ8(B:
	$B$3$NCM$O%^%9%?F~NO%/%m%C%/(B (IBM PC$B$G$O!"%^%9%?(B
	$B%/%m%C%/$O(B1.8432MHz) $B$+$i=|;;$5$l!"$=$7$F7k2L$N(B
	$B%/%m%C%/$O(B UART $B$N%\!<%l!<%H$r7hDj$9$k$G$7$g$&!#(B
	$B$3$N%l%8%9%?$O=|?t$N(B7$B$rDL$7$F%S%C%H(B0$B$rJ];}$7$^(B
	$B$9!#(B

$B!V$J$s$H$J$/$3$s$J46$8!W$GLu$7$F$_$^$7$?!#<+?.$"$j$^$;$s$G$9!#(B
$BB?J,!"0c$C$H$j$^$9!#(B

(4) ``at what point the receiver is''? $B$J$s$8$c$3$j$c$"(B?
$B86J8(B:
	These two bits control at what point the
	receiver is to generate an interrupt when
	the FIFO is active.

$BLuJ8(B:
	$B$3$N(B2$B$D$N%S%C%H$O(B FIFO $B$,5!G=$7$F$$$k>l9g(B
	$B$K%l%7!<%P$,$I$N%]%$%s%H$G3d$j9~$_$r@8@.$9(B
	$B$k$+$r@)8f$7$^$9!#(B

$BF1$8$/!V$J$s$H$J$/$3$s$J46$8!W$G$9!#(B


$B$H$$$&$3$H$G:4Gl$5$s!"$b$&>/$7$7$?$i$=$A$i$KAw$l$k$H;W$$$^$9!#(B

BTW, 9$B7n2<=\$+(B10$B7n>e=\$K!"%O%s%I%V%C%/F|K\8l2=%W%m%8%'%/%H$N(B
$B0l1~$N@.2L$r=K$$!"BG$A>e$2$N%*%U%i%$%s%_!<%F%#%s%0$d$j$^$;$L$+(B?
# $B$J$<(B9$B7n2<=\$+(B10$B7n>e=\$+$C$F(B? $B$=$l$OKM$,F|K\$K0l;~5"9q$9$k$+$i$C$9!#(B
# $B$"$5$_$5$s!"$$$DF|K\$X5"$C$F$-$^$9(B?

--
                               o
                         [=]   O
                        (.~.)_P
+==================oooO==( )//Oooo=================+
|Mitsuru Iwasaki                                   |
|15A-1-3, Scots Tower, MONT' KIARA CONDOMINIUM,    |
|Jalan 1/70C, Off Bikit Kiara, 50480 Kuala Lumpur  |
|TEL: 03-253-8579                    _/_/_/    _/  |
|FAX: 03-253-8579                   _/_/_/    _/   |
|e-mail: iwasaki@sirim.my(OFFICE)  _/  _/ _/ _/    |
|        iwasaki@pc.jaring.my(HOME)                |
|        JAA03673@niftyserve.or.jp(JAPAN)          |
+==================================================+
