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<title>1.1 ST20-C1 features</title>
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<a name="1102066"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">1.1 ST20-C1 features</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1102068"> </a>It is implemented as a 2-way superscalar, 3-stage pipeline, with an internal 16-word register cache. This architecture can sustain 4 instructions in progress, with a maximum of 2 instructions completing per cycle.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1102069"> </a>It uses a variable length instruction coding scheme based on 8-bit units which gives excellent static and dynamic code size. Instructions take between 1 and 8 units to code, with an average of 1.25 units (10 bits) per instruction.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1102070"> </a>It provides flexible prioritized vectored interrupt capabilities. The worst case interrupt latency is 120ns (at 133 MHz operating frequency).</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1102071"> </a>It provides extensive instruction level support for 16-bit digital signal processing (DSP) algorithms.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1102072"> </a>It is particularly suitable for low power and battery-powered applications, with low core operating power, and sophisticated power management facilities.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1102073"> </a>It provides extensive real-time debugging capability through the optional ST20 diagnostic controller unit (DCU) macro-cell, which supports fully non-intrusive breakpoints, watchpoints and code tracing.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1102074"> </a>It has a flexible and powerful built-in hardware scheduler. This is a light-weight real-time operating system (RTOS) directly implemented in the microcode of the ST20-C1 processor. The hardware scheduler can be customized and provides support for software schedulers.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1102075"> </a>It provides a built-in user-programmable 32-bit input/output register providing system control and communication capability directly from the CPU.</font></p>
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