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-<table class="head">
- <tr>
- <td class="head-ltitle">DS1307(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">DS1307(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">ds1307</code> &#x2014; <span class="Nd">64 x 8,
- serial, i2c real-time clock (RTC)</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Cd">device iic</code>
- <br/>
- <code class="Cd">device iicbus</code>
- <br/>
- <code class="Cd">device ds1307</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">ds1307</code> serial real-time clock (RTC) is
- a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of
- NV SRAM.</p>
-<p class="Pp">The <code class="Nm">ds1307</code> has a built-in power-sense
- circuit that detects power failures and automatically switches to the backup
- supply. Timekeeping operation continues while the part operates from the
- backup supply.</p>
-<p class="Pp">Access to <code class="Nm">ds1307</code> settings is made with the
- <a class="Xr">sysctl(8)</a> interface:</p>
-<div class="Bd Pp Li">
-<pre>dev.ds1307.0.%desc: Maxim DS1307 RTC
-dev.ds1307.0.%driver: ds1307
-dev.ds1307.0.%location: addr=0xd0
-dev.ds1307.0.%pnpinfo: name=rtc compat=maxim,ds1307
-dev.ds1307.0.%parent: iicbus1
-dev.ds1307.0.sqwe: 1
-dev.ds1307.0.sqw_freq: 32768
-dev.ds1307.0.sqw_out: 0</pre>
-</div>
-<dl class="Bl-tag">
- <dt id="dev.ds1307._d.sqwe"><var class="Va">dev.ds1307.%d.sqwe</var></dt>
- <dd>If set to 1, the SQW pin drives a square-wave of
- <var class="Va">dev.ds1307.%d.sqw_freq</var> frequency. If set to 0, the
- output level of SQW pin is controlled by
- <var class="Va">dev.ds1307.%d.sqw_out</var>.</dd>
- <dt id="dev.ds1307._d.sqw_freq"><var class="Va">dev.ds1307.%d.sqw_freq</var></dt>
- <dd>Select the frequency of the SQW pin when the square-wave output is enabled
- on <var class="Va">dev.ds1307.%d.sqwe</var>. It can be set to 1, 4096,
- 8192 and 32768.</dd>
- <dt id="dev.ds1307._d.sqw_out"><var class="Va">dev.ds1307.%d.sqw_out</var></dt>
- <dd>Set the output level of the SQW pin when
- <var class="Va">dev.ds1307.%d.sqwe</var> is set to 0.</dd>
-</dl>
-<p class="Pp">Please check the <code class="Nm">ds1307</code> datasheet for more
- details.</p>
-<p class="Pp">On a <a class="Xr">device.hints(5)</a> based system, such as
- <code class="Li">MIPS</code>, these values are configurable for
- <code class="Nm">ds1307</code>:</p>
-<dl class="Bl-tag">
- <dt id="hint.ds1307._d.at"><var class="Va">hint.ds1307.%d.at</var></dt>
- <dd>The <a class="Xr">iicbus(4)</a> that the <code class="Nm">ds1307</code> is
- connected to.</dd>
- <dt id="hint.ds1307._d.addr"><var class="Va">hint.ds1307.%d.addr</var></dt>
- <dd>The i2c address of <code class="Nm">ds1307</code>.</dd>
-</dl>
-<p class="Pp">On a <a class="Xr">FDT(4)</a> based system the following
- properties must be set:</p>
-<dl class="Bl-tag">
- <dt id="compatible"><var class="Va">compatible</var></dt>
- <dd>Must always be set to &quot;dallas,ds1307&quot; or
- &quot;maxim,ds1307&quot;.</dd>
- <dt id="reg"><var class="Va">reg</var></dt>
- <dd>The i2c address of <code class="Nm">ds1307</code>. The default address for
- <code class="Nm">ds1307</code> is 0xd0.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">fdt(4)</a>, <a class="Xr">iic(4)</a>,
- <a class="Xr">iicbus(4)</a>, <a class="Xr">sysctl(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">ds1307</code> driver first appeared in
- <span class="Ux">FreeBSD 11.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">ds1307</code> driver and this manual page
- were written by <span class="An">Luiz Otavio O Souza</span>
- &lt;<a class="Mt" href="mailto:loos@FreeBSD.org">loos@FreeBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">December 10, 2024</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>