How can I allocate a variable in program memory?

You can use MPLAB® XC32 compiler specific qualifiers as described in section 8.11 of the "MPLAB XC32 C/C++ Compiler User's Guide".

For example, in main.c, uint32_t attribute((space(prog), address(0x9D07FFF8))) hw_version = 0X12345678; void main(void) { uint32_t tmp = 0; tmp = hw_version;. After this statement is executed, the variable tmp value is 0x12345678. Note that the address 0x9D07FFF8 is a physical address and its equivalent virtual address is 0x1D07FFF8.

  Return to Top

© 2025 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.