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<TITLE>Mappy VM SDK - Interrupts</TITLE>
<META NAME="Author" CONTENT="Michael Noland">
<META NAME="Copyright" CONTENT="(C) 2001-2002 Bottled Light, Inc.">
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<H1>title</H1>

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desc
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<A NAME="regname">
<H2>regname</H2>
<TABLE BORDER="1" SUMMARY="regname">
<TR ALIGN="CENTER" BGCOLOR="#FFD050">
	<TD>Offset</TD><TD>Name</TD><TD>Type</TD>
	<TD>F</TD><TD>E</TD><TD>D</TD><TD>C</TD><TD>B</TD><TD>A</TD><TD>9</TD><TD>8</TD>
	<TD>7</TD><TD>6</TD><TD>5</TD><TD>4</TD><TD>3</TD><TD>2</TD><TD>1</TD><TD>0</TD>
</TR>
<TR ALIGN="CENTER"  BGCOLOR="#FFD050">
	<TD>$200</TD>
	<TD>IE</TD>
	<TD BGCOLOR="#C0FF70">Read Write</TD>
	<TD BGCOLOR="#000000" COLSPAN="2">&nbsp</TD>
	<TD BGCOLOR="#C0FF70">Cartridge</TD>
	<TD BGCOLOR="#C0FF70"><A HREF="joypad.html">Joypad</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="dma.html">DMA 3</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="dma.html">DMA 2</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="dma.html">DMA 1</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="dma.html">DMA 0</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="networking.html">Network</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="timers.html">Timer 3</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="timers.html">Timer 2</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="timers.html">Timer 1</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="timers.html">Timer 0</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="video.html">Y-trigger</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="video.html">H-blank</A></TD>
	<TD BGCOLOR="#C0FF70"><A HREF="video.html">V-blank</A></TD>
</TR>
</TABLE>

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<P>
<H3>Details</H3>
<UL>
<LI>Each bit in IE controls whether an <A HREF="glossary.html#irq">IRQ</A> will trigger an interrupt, in combination with IME.</LI>
<LI>All of the possible interrupts also have a seperate enable bit in respective registers that governs the generation of IRQs.</LI>
<LI>The constants in order are: <CODE>IRQ_VBLANK, IRQ_HBLANK, IRQ_YTRIGGER, IRQ_TIMER0, IRQ_TIMER1, IRQ_TIMER2, IRQ_TIMER3, IRQ_NETWORK, IRQ_DMA0, IRQ_DMA1, IRQ_DMA2, IRQ_DMA3, IRQ_JOYPAD, and IRQ_CARTRIDGE</CODE></LI>
</UL>
</P>


<P>
<H3>Details</H3>
<UL>
<LI>Each bit in IF indicates that an IRQ enabled with the corresponding bit in IE has occured.</LI>
<LI>The hardware never clears the IF register, this must be done by the user's interrupt handler writing back the bits that it has acknowledged (writing a zero will not alter the bit in IF, a 1 must be written to reset bits in IF).</LI>
</UL>
</P>

<P>
<H3>Uses and examples</H3>
<UL>
<LI>writeme fixme todo findme</LI>
</UL>
</P>

<BLOCKQUOTE>
<EM>Example: A very simple interrupt handler.</EM>
<HR><TABLE BORDER="1" BGCOLOR="#FFFFFF"><TR><TD><PRE>

// have occured by looking at the IF register.
</PRE></TD></TR></TABLE></BLOCKQUOTE>

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<P ALIGN="center">Copyright &copy; 2001 to 2002, Bottled Light, Inc.</P>

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