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<title>ring oscillator timing tests</title>
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<div style="margin-left:2.5%;margin-right:2.5%">
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<b>Ring Oscillators</b>
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<p>
This page collects ring oscillator timing tests for embedded systems (the prior page is <a href=prior/index.html>here</a>).
<p>
<center>
<b>GPIO</b>
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<p>
The GPIO test measures how quickly pins can communicate with a processor core. Two pins are connected; a bit is output on one, read on the other, and inverted in software, with the frequency of the resulting oscillation reported.
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<table border="1" style="text-align:center">
<tr>
<th>frequency (MHz)</th>
<th>processor/board</th>
<th>description</th>
<th>code</th>
<th>date</th>
</tr>
<tr>
<td>2.528</td>
<td>SAMD11C</td>
<td>IOBUS</td>
<td><a href=GPIO/SAMD11C/ring.D11C.ino>ring.D11C.ino</a></td>
<td>November 13, 2020</td>
</tr>
<tr>
<td>1.818</td>
<td>ATtiny412</td>
<td>VPORT</td>
<td><a href=GPIO/ATtiny412/ring.t412.ino>ring.t412.ino</a></td>
<td>November 13, 2020</td>
</tr>
<tr>
<td>1.171</td>
<td>SAMD11C</td>
<td>PORT</td>
<td><a href=GPIO/SAMD11C/ring.D11C.ino>ring.D11C.ino</a></td>
<td>November 13, 2020</td>
</tr>
<tr>
<td>1.056</td>
<td>ATtiny412</td>
<td>PORT</td>
<td><a href=GPIO/ATtiny412/ring.t412.ino>ring.t412.ino</a></td>
<td>November 13, 2020</td>
</tr>
<tr>
<td>0.358</td>
<td>ATtiny412</td>
<td>digitalRead/Write</td>
<td><a href=GPIO/ATtiny412/ring.t412.ino>ring.t412.ino</a></td>
<td>November 13, 2020</td>
</tr>
</table>
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