Microchip Technology SW006022-2N Data Sheet

Page of 338
MPLAB
®
 XC16 C Compiler User’s Guide
DS52071B-page 142
 2012 Microchip Technology Inc.
7.12
MEMORY MODELS
The compiler supports several memory models. Command-line options are available 
for selecting the optimum memory model for your application, based on the specific 
dsPIC DSC device part that you are using and the type of memory usage.
TABLE 7-1:
MEMORY MODEL COMMAND LINE OPTIONS 
The command-line options apply globally to the modules being compiled. Individual 
variables and functions can be declared as near, far or in eds to better control the 
code generation. For information on setting individual variable or function attributes, 
see Section 6.11 “Variable Attributes” and Section 10.2.1 “Function Specifiers”.
Option
Memory Definition
Description
-msmall-data
Up to 8 KB of data memory.
This is the default.
Permits use of PIC18 like instructions 
for accessing data memory.
-msmall-scalar
Up to 8 KB of data memory.
This is the default.
Permits use of PIC18 like instructions 
for accessing scalars in data memory.
-mlarge-data
Greater than 8 KB of data 
memory.
Uses indirection for data references.
-msmall-code
Up to 32 kWords of program 
memory. This is the default.
Function pointers will not go through a 
jump table. Function calls use RCALL 
instruction.
-mlarge-code
Greater than 32 kWords of 
program memory.
Function pointers might go through a 
jump table. Function calls use CALL 
instruction.
-mconst-in-data
Constants located in data 
memory.
Values copied from program memory 
by startup code.
-mconst-in-code
Constants located in program 
memory. This is the default.
Values are accessed via Program 
Space Visibility (PSV) data window.
-mconst-in-aux-
flash
Constants in auxiliary FLASH
Values are accessed via Program 
Space visibility window.