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<h2>
<a name="1142963"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D.3 All HCMOS5 chips</font>
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<h3>
<a name="1142964"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D.3.1 Breakpoint traphandler re-entering</font>
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<a name="1142965"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The breakpoint trap handler can re-enter if a DCU match condition (hardware code or data breakpoint) occurs while a software code breakpoint or a DCU data breakpoint is being handled.</font>
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<h5>
<a name="1142966"> </a><i><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">Work-arounds</font></i>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142967"> </a>Avoid setting breakpoints that cover the breakpoint trap handler workspace.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142968"> </a>Avoid writing breakpoint instructions into the breakpoint trap handler code.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142969"> </a>Avoid setting software breakpoints that occur immediately after a data breakpoint has occurred.</font></p>
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<a name="1142970"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D.3.2 Incorrect jumptrace</font>
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<a name="1142971"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">If two jumps happen in quick succession, there is a possibility that the second jump is not recorded in the jumptrace buffer.</font>
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<a name="1142972"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D.3.3 Ranged breakpoint problems</font>
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<a name="1142973"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The comparison logic in breakrange is incorrect. If code is being executed in a break range then there is also a match for the address equal to the upper; the match should be for greater than or equal to the lower and less than the upper).</font>
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<a name="1142974"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">On restart from a breakpoint on the first location of a break range the breakpoint trap handler will be re-entered.</font>
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<a name="1142975"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">If a ranged breakpoint is set on the instruction following a call to a subroutine, the breakpoint is sometimes missed on return from the call.</font>
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<a name="1142976"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D.3.4 Breakpoint problem</font>
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<a name="1142977"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Breakpoints do not work in certain circumstances related to a conditional jump. instruction <strong>cj</strong>. The breakpoint will not work if there is a combination of:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142978"> </a>a breakpoint set on the target of a <strong>cj</strong>, and </font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142979"> </a>a breakpoint set on the instruction following the <strong>cj</strong>, and </font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1142980"> </a>the jump is taken.</font></p>
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<a name="1142981"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">D.3.5 Traps and interrupts when processor is idle</font>
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<a name="1142982"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">On HCMOS5 versions of the ST20-C2 core, if the processor is idle and a trap or interrupt occurs and the processor returns from the trap or interrupt back to its idle state then the DCU will become disabled.</font>
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<a name="1142983"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">The <font size=2 face=Courier><strong>stop</strong></font> command cannot interrupt the target while the DCU is disabled, and therefore it has no effect in this case. The DCU is re-enabled when the processor becomes busy.</font>
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<a name="1142984"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">With toolsets R1.8.1 and later, there are software work-arounds in the breakpoint traphandler and the scheduler trap handler within OS20. Other traps and interrupts will still have the same effect.</font>
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