SW006012 Microchip Technology, SW006012 Datasheet - Page 95

• Manufacturer Part Number: SW006012
• Description: C COMPILER FOR DSPIC30F FAMILY
• Manufacturer: Microchip Technology
• Type: MPLAB® C30 Compilerr
• Series: PIC24 & DsPICr

Specifications of SW006012

• Supported Families: PIC24, DsPIC30F And DsPIC33F
• Core Architecture: PIC, DsPIC
• Kit Contents: Software And Docs
• Mcu Supported Families: PIC24 MCUs And DsPIC DSCs
• Tool Type: Compiler
• Processor Series: PIC24, dsPIC
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: dsPIC30F
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2007 Microchip Technology Inc.
EXAMPLE 6-2:
#include <p30fxxxx.h>
int main(void) {
These steps need only be done once. Unless PSVPAG is changed, variables in EE
data space may be read by referring to them as normal C variables, as shown in the
example.
6.7.2
The TBLRDx instructions are not directly supported by the compiler, but they can be
used via inline assembly. Like PSV accesses, a 23-bit address is formed from an SFR
value and the address encoded as part of the instruction. To access the same memory
as given in the previous example, the following code may be used:
To use the TBLRDx instructions:
• The TBLPAG register must be set to the appropriate address for the program
• The TBLRDx instruction can only be accessed from an __asm__ statement; refer
EXAMPLE 6-3:
#include <p30fxxxx.h>
#define eedata_read(src, dest) {
int main(void) {
memory to be accessed. For EE data, this will be 0x7F, but it is best to use the
__builtin_tblpage() function.
to the “dsPIC30F/33F Programmer’s Reference Manual” (DS70157) for
information on this instruction.
PSVPAG =
CORCONbits.PSV = 1;
/* ... */
if (user_data[2]) ;/* do something */
}
register int eedata_addr;
register int eedata_val;
eedata_addr =
__
dest = eedata_val;
}
int value;
TBLPAG =
eedata_read(user_data[2], value);
if (value) ; /* do something */
}
Note:
asm
__
Accessing EEDATA using TBLRDx instructions
This access model is not compatible with the compiler-managed PSV
(-mconst-in-code) model. You should be careful to prevent conflict.
("tblrdl [%1], %0" : "=r"(eedata_val) : "r"(eedata_addr)); \
__
__
builtin_psvpage(&user_data);
builtin_tblpage(&user_data);
__
EEDATA ACCESS VIA PSV
EEDATA ACCESS VIA TABLE READ
builtin_tbloffset(&src); \
\
\
\
\
\
Device Support Files
DS51284F-page 89