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| XCROM Compiler Directive| Abbreviation | | XC | | Arguments | | None. | | Default | | All xdata variables are initialized during the execution of the startup code. | | µVision | | Options — C51 — Misc controls. | | Description | | The XCROM directive causes the compiler to store initialization for const xdata variables directly in ROM memory rather than using a table entry in ?C?INITSEG. This allows you to use xdata memory for constants and frees up code memory for your application program. Note - Some new 8051 devices provide memory management units that can map ROM space into the xdata memory area.
- For classic 8051 devices, you may use a ROM device instead of a RAM for the xdata space.
| | See Also | | STRING | | Example | |
// "Hello World\n" is stored in a ROM that
// is addressed in the xdata memory space.
#pragma XCROM // Enable const xdata ROM
const char xdata text [] = "Hello World\n";
void main (void) {
printf (text);
}
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