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MPLAB ? C32 C Compiler User’s Guide
_CP0_ REGISTER _ NAME _ FIELD _ NAME _MASK – the bits that are part of this field are set
_CP0_ REGISTER _ NAME _ FIELD _ NAME _LENGTH – the number of bits that this field occupies
For example the vector spacing field of the IntCtl register has the following defines:
#define _CP0_INTCTL_VS_POSITION 0x00000005
#define _CP0_INTCTL_VS_MASK 0x000003E0
#define _CP0_INTCTL_VS_LENGTH 0x00000005
4.7.4
CP0 Access Macros
When the CP0 register definitions header file is included from a C file, CP0 access
macros are defined. Each CP0 register may have up to six different access macros
defined:
_CP0_GET_ REGISTER _ NAME ()
_CP0_SET_ REGISTER _ NAME (val)
_CP0_XCH_ REGISTER _ NAME (val)
_CP0_BIS_ REGISTER _ NAME (set)
_CP0_BIC_ REGISTER _ NAME (clr)
_CP0_BCS_ REGISTER _ NAME (clr, set)
Returns the value for register, REGISTER _ NAME .
Sets the register, REGISTER _ NAME , to val, and
returns void. Only defined for registers that
contain a writable field.
Sets the register, REGISTER _ NAME , to val, and
returns the previous register value. Only
defined for registers that contain a writable
field.
Sets the register, REGISTER _ NAME , to
(reg |= set), and returns the previous register
value. Only defined for registers that contain
writable bit fields.
Sets the register, REGISTER _ NAME , to
(reg &= ~clr), and returns the previous
register value. Only defined for registers that
contain writable bit fields.
Sets the register, REGISTER _ NAME , to
(reg = (reg & ~clr) | set), and returns the
previous register value. Only defined for
registers that contain writable bit fields.
4.8
CONFIGURATION BIT ACCESS
4.8.1
#pragma config
The #pragma config directive specifies the processor-specific configuration settings
(i.e., configuration bits) to be used by the application. Refer to the “ PIC32MX
Configuration Settings ” on-line help for more information.
Configuration settings may be specified with multiple #pragma config directives.
MPLAB C32 C compiler verifies that the configuration settings specified are valid for
the processor for which it is compiling. If a given setting in the configuration word has
not been specified in any #pragma config directive, the bits associated with that
setting default to the unprogrammed value.
For each configuration word for which a setting is specified with the #pragma config
directive, the compiler generates a read-only data section named .config_ address ,
where address is the hexadecimal representation of the address of the configuration
word. For example, if a configuration setting was specified for the configuration word
located at address 0xBFC02FFC , a read-only data section named
. config_BFC02FFC would be created.
DS51686A-page 54
? 2007 Microchip Technology Inc.
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