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MPLAB ? C32 C Compiler User’s Guide
variable are named _ramfunc_length . In addition, the linker script provides three
variables that contain the address of the bus matrix registers. These variables are
named _bmxdkpba_address , _bmxdudba_address , and _bmxdupba_address .
The following calculations are used to calculate these addresses:
_bmxdkpba_address = _ramfunc_begin -
ORIGIN(${DATA_MEMORY_LOCATION}) ;
_bmxdudba_address = LENGTH(${DATA_MEMORY_LOCATION}) ;
_bmxdupba_address = LENGTH(${DATA_MEMORY_LOCATION}) ;
The linker script ensures that RAM functions are aligned to a 2K alignment boundary
as is required by the BMXDKPBA register.
FIGURE 5-9:
BUS MATRIX INITIALIZATION
5.7.2.9
INITIALIZE CP0 REGISTERS
The CP0 registers are initialized in the following order:
1.
2.
3.
4.
5.
6.
Count register
Compare register
EBase register
IntCtl register
Cause register
Status register
5.7.2.9.1
Hardware Enable Register ( HWREna – CP0 Register 7, Select 0)
This register contains a bit mask that determines which hardware registers are
accessible via the RDHWR instruction. Privileged software may determine which of the
hardware registers are accessible by the RDHWR instruction. In doing so, a register may
be virtualized at the cost of handling a Reserved Instruction Exception, interpreting the
instruction, and returning the virtualized value. For example, if it is not desirable to
provide direct access to the Count register, access to the register may be individually
disabled and the return value can be virtualized by the operating system.
No initialization is performed on this register in the PIC32MX startup code.
DS51686A-page 66
? 2007 Microchip Technology Inc.
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相关PDF资料
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
SY87729LHI-EVAL
BOARD EVAL N SY87729 EXPERIMENT
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