SW006015【PDF 57/120 页】C COMPILER MPLAB C32

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Low Level Processor Control

4.6

4.7

SPECIAL FUNCTION REGISTER ACCESS

There are three steps to follow when using SFRs in an application.

1. Include either the generic processor header file (i.e., p32xxxx.h ) or the

processor-specific header file for the appropriate device (e.g.,

proc/p32mx360f512l.h ).

#include <p32xxxx.h>

2. Access SFRs like any other C variables. The source code can write to and/or

read from the SFRs. For example, the following statement clears all the bits to

zero in the special function register for Timer 1:

TMR1 = 0;

The next statement enables the Watchdog Timer:

WDTCONbits.ON = 1;

3. Link with the default linker script or include the processor.o file for the

appropriate processor in your project.

CP0 REGISTER ACCESS

4.7.1

CP0 Register Definitions Header File

The CP0 register definitions header file ( cp0defs.h ) is a file that contains definitions

for the CP0 registers and their fields. In addition, it contains macros for accessing the

CP0 registers. The CP0 register definitions header file is located in

c:\Program Files\Microchip\MPLAB C32\pic32mx\include , where

c:\Program Files\Microchip\MPLAB C32 is the directory in which the MPLAB

C32 toolchain was installed. The CP0 register definitions header file was designed to

work with either Assembly or C files.

The CP0 register definitions header file is dependent on macros defined within the

processor generic header file (See Section 4.3 “Generic Processor Header File” ).

To include the CP0 register definitions header file, use the following from within your

source code:

#include <p32xxxx.h>

4.7.2

CP0 Register Definitions

When the CP0 register definitions header file is included from an Assembly file, the

CP0 registers are defined as:

#define _CP0_ REGISTER _ NAME $register_number, select_number

For example, the IntCtl register is defined as:

#define _CP0_INTCTL $12, 1

When the CP0 register definitions header file is included from a C file, the CP0 registers

and selects are defined as:

#define _CP0_ REGISTER _ NAME register_number

#define _CP0_ REGISTER _ NAME _SELECT select_number

For example, the IntCtl register is defined as:

#define _CP0_INTCTL 12

#define _CP0_INTCTL_SELECT 1

4.7.3

CP0 Register Field Definitions

When the CP0 register definitions header file is included from either an Assembly or a

C file, three #defines exist for each of the CP0 register fields.

_CP0_ REGISTER _ NAME _ FIELD _ NAME _POSITION – the starting bit location

? 2007 Microchip Technology Inc.

DS51686A-page 53

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