Cx51 User's Guide

FARRAY

The FARRAY macro accesses an array of a specified type in the far memory area (the HDATA memory class). You may use this macro in your programs as follows:

#include <absacc.h>    /* Include Macro Definitions */
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int i;
long l;

l = FARRAY (long, 0x8000)[i];
FARRAY (long, 0x8000)[10] = 0x12345678;

#define DualPortRam FARRAY (int, 0x24000)
DualPortRam [i] = 0x1234;
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This macro scales the index by the size of the specified type and adds the result to specified address. The result is the memory address used.

Note

• With Dallas Contiguous Mode you may only address the memory area X:0 - X:0x7EFFFF.
• Objects accessed using this macro may not cross a 64KB segment boundary. For example, you cannot access a long array that starts at address 0xFFFE.