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<title>µCsim: CPU types</title>
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<h1>Select type of CPU</h1>
The simulator supports following type of microprocessors from MCS51 family:
<p><a href="#51">8051/8031</a> <br>
<a href="#52">8052/8032</a> <br>
<a href="#ds390">DS390</a> <br>
<a href="#51r">8051R</a> <br>
<a href="#89c51r">89C51R</a> <br>
<a href="#251">80251</a> </p>
<h3><a name="51">8051/8031</a></h3>
You can select this type of microcontroller using one of the following
parameter for -t option:
<ul>
<li>51 (HMOS type) </li>
<li>8051 (HMOS type) </li>
<li>8751 (HMOS type) </li>
<li>C51 (CMOS type) </li>
<li>80C51 (CMOS type) </li>
<li>87C51 (CMOS type) </li>
<li>31 (HMOS type) </li>
<li>8031 (HMOS type) </li>
<li>C31 (CMOS type) </li>
<li>80C31 (CMOS type) </li>
</ul>
It includes core 51 features:
<ul>
<li>64k external RAM </li>
<li>64k ROM </li>
<li>128 byte internal RAM </li>
<li>2 timers (timer #0, timer #1) </li>
<li>Serial interface </li>
<li>4 8-bit quasi bi-directional ports </li>
</ul>
CMOS types also include:
<ul>
<li>Idle mode </li>
<li>Power down mode </li>
</ul>
<h3><a name="52">8052/8032</a></h3>
You can select this type of microcontroller using one of the following
parameter for -t option:
<ul>
<li>52 (HMOS type) </li>
<li>8052 (HMOS type) </li>
<li>8752 (HMOS type) </li>
<li>C52 (CMOS type) </li>
<li>80C52 (CMOS type) </li>
<li>87C52 (CMOS type) </li>
<li>32 (HMOS type) </li>
<li>8032 (HMOS type) </li>
<li>C32 (CMOS type) </li>
<li>80C32 (CMOS type) </li>
</ul>
It includes same features as <a href="#51">8051/8031</a> microcontrollers
and additionally:
<ul>
<li>3 timers (timer #0, timer #1, timer #2) </li>
<li>256 bytes of internal RAM </li>
</ul>
<h3><a name="ds320">DS320</a></h3>
You can select this type of microcontroller using <b>DS320</b> as parameter
for -t option (this is a CMOS type). It includes same features as <a href="#52">8052</a>
and adds:
<ul>
<li>support for dual DPTR register </li>
</ul>
<h3><a name="ds390">DS390</a></h3>
You can select this type of microcontroller using <b>DS390</b> as parameter
for -t option (this is a CMOS type). It includes same features as <a href="#52">8052</a>
and adds:
<ul>
<li>24 bit flat mode </li>
<li>support for dual DPTR register </li>
<li>128k external RAM </li>
<li>128k ROM </li>
<li>4k internal SRAM usable </li>
<li>10 bit stack mode </li>
<li>"timed access" of SFRs </li>
</ul>
<h3><a name="51r">8051R</a></h3>
You can select this type of microcontroller using one of the following
parameter for -t option (all are CMOS types):
<ul>
<li>51R </li>
<li>51RA </li>
<li>51RB </li>
<li>51RC </li>
<li>C51RA </li>
<li>C51RB </li>
<li>C51RC </li>
</ul>
It includes all features that <a href="#52">8052/8032</a> does and
additionally:
<ul>
<li>Extended interrupt priority system (4 priority levels) </li>
<li>Extended serial line interface (automatic address recognition) </li>
<li>Watchdog timer </li>
</ul>
<h3><a name="89c51r">89C51R</a></h3>
You can select this type of microcontroller using <tt>89C51R</tt> parameter
for -t option (this CPU is always CMOS). This is a Philips clone, excluding
duplicated DPTR it is similar to 8051XR from Intel.
<p>It includes all features that <a href="#51r">8051R</a> does and
additionally: </p>
<ul>
<li>PCA (Programmable Counter Array): 5 16-bit counter, one of them can
act as watchdog timer. </li>
<li>Duplicated DPTR. </li>
</ul>
<h3><a name="251">80251</a></h3>
You can select this type of microcontroller using one of the following
parameter for -t option (all are CMOS types):
<ul>
<li>251 </li>
<li>C251 </li>
</ul>
<p>It includes all features that <a href="#89c51r">89C51R</a> does and
additionally: </p>
<ul>
<li>Nothing implemented yet. </li>
</ul>
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