C51: Reserving Space in Code Memory

QUESTION

My target hardware has ROM from 0000h to 7FFFh and from C000h to FFFFh. I need to reserve the memory from 8000h to BFFFh. How do I tell the linker not to place any program code in that area?

ANSWER

The easiest way to do this is to declare a 16K character array in code space as shown below:

code char dummy_block [0x4000] _at_ 0x8000;

This will declare a 16K array at address 0x8000 in the code space. The linker won't place code there. You program code will "flow" around this dummy array.

MORE INFORMATION

• C51: Reserving Code Space
• C51: Accessing Specific Memory Bytes
• C51: Reserving Space in Code Banks

Last Reviewed: Thursday, February 25, 2021