Microchip Technology SW006022-2N Data Sheet

 2012 Microchip Technology Inc.

DS52071B-page 305

Configuration Settings macros are provided that can be used to set configuration bits. 
For example, to set the FOSC bit using a macro, the following line of code can be 
inserted before the beginning of your C source code:

  _FOSC(CSW_FSCM_ON & EC_PLL16);

This would enable the external clock with the PLL set to 16x and enable clock switching 
and fail-safe clock monitoring.

Similarly, to set the FBORPOR bit:

  _FBORPOR(PBOR_ON & BORV_27 & PWRT_ON_64 & MCLR_DIS);

This would enable Brown-out Reset at 2.7 Volts and initialize the Power-up timer to 64 
milliseconds and configure the use of the MCLR pin for I/O.

Configuration Settings macros are defined in compiler header files for each device. 
Please refer to your device’s header files for a complete listing of related macros. 
Header files are located, by default, in:

C:\Program Files\Microchip\mplabxc16\v1.0\support\device\h

where device is the 16-bit device family you are using.

/*-----------------------------------------------------------------

 * MPLAB-Cxx  dsPIC33FJ128MC510 processor header

 *

 * (c) Copyright 1999-2010 Microchip Technology, All rights reserved

 *-----------------------------------------------------------------*/

   :

   :

/* Register FWDT (0xf8000a)                               */

extern __attribute__((space(prog))) int _FWDT;

#define _FWDT(x) __attribute__((section("__FWDT.sec"),space(prog))) 

int _FWDT = (x);

/*

** Only one invocation of FWDT should appear in a project,

** at the top of a C source file (outside of any function).

**

** The following constants can be used to set FWDT.

** Multiple options may be combined, as shown:

**

** _FWDT( OPT1_ON & OPT2_OFF & OPT3_PLL )

**

**   Watchdog Timer:

**     FWDTEN_OFF           Disabled

**     FWDTEN_ON            Enabled

**

**   Windowed WDT:

**     WINDIS_ON            Enabled