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<p class=MsoNormal><a name=""><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Thanks John.<o:p></o:p></span></font></a></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>What is the reason for
RXD0 resistor? Haven’t heard about this one before.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>How did you end up with the
1K value?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p><font size=3 color=navy face="Times New Roman"><span style='font-size:12.0pt;
color:navy'>Med venlig hilsen / Best regards / mit freundlichen Grüßen</span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p><b><font size=3 color=navy face="Times New Roman"><span style='font-size:
12.0pt;color:navy;font-weight:bold'>EC POWER A/S</span></font></b><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p><b><font size=3 color=navy face="Times New Roman"><span style='font-size:
12.0pt;color:navy;font-weight:bold'>Steven Lose</span></font></b><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p><font size=3 color=navy face="Times New Roman"><span style='font-size:12.0pt;
color:navy'>Software Ingeniør<o:p></o:p></span></font></p>
<p><font size=3 color=navy face="Times New Roman"><span style='font-size:12.0pt;
color:navy'>Tlf.: +45 87434100<o:p></o:p></span></font></p>
<p><font size=3 color=navy face="Times New Roman"><span style='font-size:12.0pt;
color:navy'>Direkte tlf. +45 58286608<o:p></o:p></span></font></p>
<p><font size=3 color=navy face="Times New Roman"><span style='font-size:12.0pt;
color:navy'>Email: <a href="blocked::mailto:bsl@ecpower.dk">sl@ecpower.dk</a><o:p></o:p></span></font></p>
<p><font size=3 color=navy face="Times New Roman"><span style='font-size:12.0pt;
color:navy'><a href="http://www.ecpower.dk">www.ecpower.dk</a></span></font><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>Fra:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> icc-avr-bounces@imagecraft.com
[mailto:icc-avr-bounces@imagecraft.com] <b><span style='font-weight:bold'>På
vegne af </span></b>John Baraclough<br>
<b><span style='font-weight:bold'>Sendt:</span></b> 12. marts 2007 16:42<br>
<b><span style='font-weight:bold'>Til:</span></b> Discussion list for ICCAVR
and ICCtiny Users. You do NOT need tosubscribe to icc-announce if you are a
member of this.<br>
<b><span style='font-weight:bold'>Emne:</span></b> Re: [Icc-avr] SPI master and
slave</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Connect the ISP header pins for the slave directly to the mega8 MISO,
MOSI & SCK and isolate these from the other processor with 1k resistors.<br>
<br>
You should do the same with the RXD0 pin on the mega128. TXD0 is OK without a
resistor and SCK will be isolated by the resistor that goes to the mega8 pins.<br>
<br>
A picture is worth 1k words so view this in a fixed pitch font such as Courier.<br>
<br>
</span></font><font face="Courier New"><span style='font-family:"Courier New"'>
ISP ISP<br>
<br>
___ | |
| | | |<br>
RXD0 -|___|-------)-)-+ |
| |<br>
| | | | |<br>
TXD0
-------------)-+ |
| |<br>
| | | |<br>
| ___ | | |<br>
MOSI -------------)------|___|--)-o-)---- MISO<br>
|
| |<br>
| ___ | |<br>
M128 MISO
-------------)------|___|--)---o---- MOSI M8<br>
| |<br>
| ___ |<br>
SCK -------------o------|___|--o-------- SCK<br>
<br>
<br>
(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)<br>
<br>
<br>
</span></font>All the best for now,<br>
John<br>
<br>
<br>
At 13:14 12/03/2007, you wrote:<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Content-class: urn:content-classes:message<br>
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boundary="----_=_NextPart_001_01C764A8.57BB54C1"<br>
<br>
</span></font><font size=2><span style='font-size:10.0pt'>Hi.<br>
<br>
In a new design, I want a Master (atmega 128) to talk to a Slave (atmega8).<br>
But do I run into problems during programming with the ISP?<br>
For example if I want to program the Slave and the master is talking on the SPI
port, I probably run into trouble.<br>
Do I need resistors on the wires? How big?<br>
I would expect Atmel to have some application notes on this, but did not find
any.<br>
<br>
</span></font><br>
Med venlig hilsen / Best regards / mit freundlichen Grüßen<br>
<br>
<b><font color=navy><span style='color:navy;font-weight:bold'>EC POWER A/S<br>
</span></font></b><br>
<b><font color=navy><span style='color:navy;font-weight:bold'>Steven Lose<br>
</span></font></b><br>
Software Ingeniør<br>
<br>
Tlf.: +45 87434100<br>
<br>
Direkte tlf. +45 58286608<br>
<br>
Email: <a href="blocked::mailto:bsl@ecpower.dk">sl@ecpower.dk</a><br>
<br>
<a href="http://www.ecpower.dk/" eudora=autourl>www.ecpower.dk</a><br>
<br>
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