except8.htm

来自「ST20 Embedded Toolset R2.0.5用于开发基于ST20芯片」· HTM 代码 · 共 49 行

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  <a name="1102417"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">6.7 	 Traps</font>
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<p>
  <a name="1102418"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The ST20-C1 has a system of traps which act as software generated interrupts. Any level of exception can be called as a user exception using <strong>ecall</strong>. This mechanism can be used for system calls to an operating system. In addition, some special exception levels are reserved for system use to provide for the trapping of breakpoints, scheduling events, illegal operations and the machine becoming idle. The reserved `system' exception levels are described in <a href="except2.htm#1102122"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Section

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