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<H2><A NAME="SECTION005611000000000000000">
4.6.11 Memory Models</A>
</H2>

<P>
The following memory models are supported by the PIC16 port:

<UL>
<LI>small model
</LI>
<LI>large model
</LI>
</UL>
Memory model affects the default size of pointers within the source.
The sizes are shown in the next table:

<P>
<DIV ALIGN="CENTER">
<TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="CENTER">Pointer sizes according to memory model</TD>
<TD ALIGN="CENTER">small model</TD>
<TD ALIGN="CENTER">large model</TD>
</TR>
<TR><TD ALIGN="CENTER">code pointers</TD>
<TD ALIGN="CENTER" COLSPAN=1>16-bits</TD>
<TD ALIGN="CENTER">24-bits</TD>
</TR>
<TR><TD ALIGN="CENTER">data pointers</TD>
<TD ALIGN="CENTER" COLSPAN=1>16-bits</TD>
<TD ALIGN="CENTER">16-bits</TD>
</TR>
</TABLE>
</DIV>
<P>
<DIV ALIGN="CENTER">
</DIV>

<P>
It is advisable that all sources within a project are compiled with
the same memory model. If one wants to override the default memory
model, this can be done by declaring a pointer as <B>far</B> or
<B>near</B>. Far selects large memory model's pointers, while near
selects small memory model's pointers.

<P>
The standard device libraries (see <A HREF="node127.html#sub:PIC16_Header-Files">4.6.8</A>)
contain no reference to pointers, so they can be used with both memory
models.

<P>
<BR><HR>
<ADDRESS>

2011-03-20
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