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<DIV><FONT face=Tahoma><SPAN class=440031116-11072003></SPAN><FONT size=2><FONT
face=Arial><FONT color=#0000ff>B<SPAN
class=440031116-11072003>ert,</SPAN></FONT></FONT></FONT></FONT></DIV>
<DIV><FONT face=Tahoma><FONT size=2><FONT face=Arial><FONT color=#0000ff><SPAN
class=440031116-11072003></SPAN></FONT></FONT></FONT></FONT> </DIV>
<DIV><FONT face=Tahoma><FONT size=2><FONT face=Arial><FONT color=#0000ff><SPAN
class=440031116-11072003>Sorry, for dropping the link in prev. email. Also
if you are buffering MIDI (instead of interpreting it as it comes in) you
should be able to interleave the key and LED activity
nicely.</SPAN></FONT></FONT></FONT></FONT></DIV>
<DIV><SPAN class=530334315-11072003><FONT face=Arial><FONT color=#0000ff><FONT
size=2><SPAN
class=440031116-11072003> </SPAN></FONT></FONT></FONT></SPAN></DIV>
<DIV><SPAN class=530334315-11072003><FONT face=Arial><FONT color=#0000ff><FONT
size=2><SPAN class=440031116-11072003> </SPAN>You might want to take a look
at this Maxim product page.<SPAN
class=440031116-11072003> </SPAN></FONT></FONT></FONT></SPAN></DIV>
<DIV><SPAN class=530334315-11072003><FONT face=Arial><FONT color=#0000ff><FONT
size=2><SPAN
class=440031116-11072003> </SPAN></FONT></FONT></FONT></SPAN></DIV>
<DIV><FONT color=#0000ff><SPAN class=530334315-11072003><A
href="http://www.maxim-ic.com/MaximProducts/DisplayDrivers/led-drivers.htm"><FONT
face=Arial
size=2>http://www.maxim-ic.com/MaximProducts/DisplayDrivers/led-drivers.htm</FONT></A><SPAN
class=440031116-11072003><FONT face=Arial
size=2> </FONT></SPAN></SPAN></FONT></DIV>
<DIV><FONT color=#0000ff><SPAN class=530334315-11072003><SPAN
class=440031116-11072003> </SPAN></SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=530334315-11072003>regards,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=530334315-11072003>p</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=530334315-11072003></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=530334315-11072003></SPAN></FONT> </DIV>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
owner-synth-diy@dropmix.xs4all.nl
[mailto:owner-synth-diy@dropmix.xs4all.nl]<B>On Behalf Of </B>Bert
Schiettecatte<BR><B>Sent:</B> Friday, July 11, 2003 1:36 AM<BR><B>To:</B>
synth-diy@dropmix.xs4all.nl<BR><B>Subject:</B> RE: [sdiy] I/O
trouble...<BR><BR></FONT></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Hi
laurie,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Thanks
for your email! I checked those parts on <SPAN class=SpellE>digikey</SPAN> and
they are all obsolete. I’d also like to be able to adjust brightness
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><SPAN class=GramE><FONT face=Arial color=navy size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">through</SPAN></FONT></SPAN><FONT
face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">
PWM … <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">I’m
actually not sure what will happen if I try to do PWM on the <SPAN
class=SpellE>LEDs</SPAN> from my MCU and the MCU gets interrupted now and
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Then
by the UART for </SPAN></FONT><st1:place><FONT face=Arial color=navy
size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">MIDI</SPAN></FONT></st1:place><FONT
face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">
communications<SPAN class=GramE>… ?</SPAN><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Thanks,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><SPAN class=SpellE><SPAN class=GramE><FONT face=Arial
color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">bert</SPAN></FONT></SPAN></SPAN><FONT
face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Tahoma size=2><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma; mso-ansi-language: EN-US">-----Original
Message-----<BR><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Elby Designs
[mailto:elby_designs@ozemail.com.au<SPAN class=GramE>] <BR><B><SPAN
style="FONT-WEIGHT: bold">Sent</SPAN></B></SPAN><B><SPAN
style="FONT-WEIGHT: bold">:</SPAN></B> vrijdag 11 juli 2003 9:55<BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> Bert Schiettecatte<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [sdiy] I/O
trouble...</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">The MM5484 (there are others that
are similar) is a 16-segment LED driver that uses Nationals MicroWire for
communications. That is a 3-wire communications path for 16-segments and 4-wires
for 32 segments.</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Also check out there MM5450 and
MM5451 chips.</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"><BR>Best Regards<BR>Laurie Biddulph<BR><A
href="http://www.ozemail.com.au/~boobies">http://www.ozemail.com.au/~boobies</A><BR>Mobile:
0404 846 943<o:p></o:p></SPAN></FONT></P></DIV>
<BLOCKQUOTE
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: medium none; PADDING-LEFT: 4pt; PADDING-BOTTOM: 0cm; MARGIN: 5pt 0cm 5pt 3.75pt; BORDER-LEFT: black 1.5pt solid; PADDING-TOP: 0cm; BORDER-BOTTOM: medium none">
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">----- Original Message -----
<o:p></o:p></SPAN></FONT></P></DIV>
<DIV style="font-color: black">
<P class=MsoNormal style="BACKGROUND: #e4e4e4; MARGIN-LEFT: 35.4pt"><B><FONT
face=Arial size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">From:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <A
title=bert.schiettecatte@esat.kuleuven.ac.be
href="mailto:bert.schiettecatte@esat.kuleuven.ac.be">Bert Schiettecatte</A>
<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><B><FONT face=Arial
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">To:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <A
title=synth-diy@dropmix.xs4all.nl
href="mailto:synth-diy@dropmix.xs4all.nl">synth-diy@dropmix.xs4all.nl</A>
<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><B><FONT face=Arial
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Sent:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> Friday,
July 11, 2003 9:09 AM<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><B><FONT face=Arial
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Subject:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> [sdiy]
I/O trouble...<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></DIV>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi
All,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">On my
daily adventures with microcontrollers I am faced with another I/O problem.
Please forgive me my silly questions since I’m not an electronics expert.
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Here
goes:<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">I have a
MCU with 2 8-bit ports available, one of them is the A/D. Since I’m connecting
an LCD to the MCU as well, I need one port as the LCD’s data bus.
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">So that
leaves me without any pins to light my LED matrix (32 leds = 4x8) and scan my
key matrix (up to 32 keys). <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">I
thought about putting an SN74CBT16233 on the 2 8-bit ports, this will give me
another 16 I/O lines. This IC is a 16-bit 1-of-2 FET multiplexer. So I would
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">put the
A/D and LCD data bus on one output of the multiplexer and the key matrix + led
matrix on the other output of the multiplexer. The key and led matrix
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">would be
8 rows which I want to put power on sequentially, and then use 4 columns to
light the LEDs and 4 columns to scan the keys. Does this make
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">any
sense? I’m just trying to find a way to hook up all this I/O. Argh!
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">It’s ok
if I lose some brightness by multiplexing, as long as they have a decent
visibility I’m happy. I’m also concerned that the MCU might go to heaven if I
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">make it
source and sink the current for the LEDs (even when only one LED gets lit at a
time for a very short period). <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Thanks
for any suggestions…<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB">Bert
(very tired and going to bed now)<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 35.4pt"><FONT face=Arial size=2><SPAN
lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-ansi-language: EN-GB"><o:p> </o:p></SPAN></FONT></P></BLOCKQUOTE></DIV></BODY></HTML>