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<H2><A NAME="SECTION00492000000000000000">
3.9.2 MCS51/DS390 Interrupt Service Routines</A>
</H2>

<P>
Interrupt<A NAME="1729"></A> numbers and the corresponding address
&amp; descriptions for the Standard 8051/8052 are listed below. SDCC
will automatically adjust the <A NAME="1730"></A> to the
maximum interrupt number specified.
<BR>
<P>
<DIV ALIGN="CENTER">
<TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="CENTER">Interrupt #</TD>
<TD ALIGN="LEFT">Description</TD>
<TD ALIGN="LEFT">Vector Address</TD>
</TR>
<TR><TD ALIGN="CENTER">0</TD>
<TD ALIGN="LEFT">External 0</TD>
<TD ALIGN="LEFT">0x0003</TD>
</TR>
<TR><TD ALIGN="CENTER">1</TD>
<TD ALIGN="LEFT">Timer 0</TD>
<TD ALIGN="LEFT">0x000b</TD>
</TR>
<TR><TD ALIGN="CENTER">2</TD>
<TD ALIGN="LEFT">External 1</TD>
<TD ALIGN="LEFT">0x0013</TD>
</TR>
<TR><TD ALIGN="CENTER">3</TD>
<TD ALIGN="LEFT">Timer 1</TD>
<TD ALIGN="LEFT">0x001b</TD>
</TR>
<TR><TD ALIGN="CENTER">4</TD>
<TD ALIGN="LEFT">Serial</TD>
<TD ALIGN="LEFT">0x0023</TD>
</TR>
<TR><TD ALIGN="CENTER" COLSPAN=1>5</TD>
<TD ALIGN="LEFT">Timer 2 (8052)</TD>
<TD ALIGN="LEFT">0x002b</TD>
</TR>
<TR><TD ALIGN="CENTER">...</TD>
<TD ALIGN="LEFT">&nbsp;</TD>
<TD ALIGN="LEFT">...</TD>
</TR>
<TR><TD ALIGN="CENTER">n</TD>
<TD ALIGN="LEFT">&nbsp;</TD>
<TD ALIGN="LEFT">0x0003 + 8*n</TD>
</TR>
</TABLE>
<BR></DIV>
<P>
<DIV ALIGN="CENTER">
</DIV>

<P>
If the interrupt service routine is defined without <I>using<A NAME="1740"></A><A NAME="1741"></A></I>
a register bank or with register bank 0 (<I>using</I> 0), the compiler
will save the registers used by itself on the stack upon entry and
restore them at exit, however if such an interrupt service routine
calls another function then the entire register bank will be saved
on the stack. This scheme may be advantageous for small interrupt
service routines which have low register usage.

<P>
If the interrupt service routine is defined to be using a specific
register bank then only <I>a, b, dptr</I> &amp; psw are saved and restored,
if such an interrupt service routine calls another function (using
another register bank) then the entire register bank of the called
function will be saved on the stack<A NAME="1744"></A>. This scheme is
recommended for larger interrupt service routines.
<P><P>
<BR>


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2011-03-20
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