C166 User's Guide

MVAR

The MVAR macro accesses absolute memory addresses in the far memory area (in segmented mode) or in the standard near memory area (in Tiny model or non-segmented mode). You may use this macro in your programs as follows:

#include <absacc.h>    /* Include Macro Definitions */
.
.
.
#define IOVAL MVAR (long, 0x4FFE)  /* long at 0x4FFE */

var = IOVAL;                       /* read */
IOVAL = 0x10;                      /* write */

var = MVAR (int, 0x4002)           /* read int from 0x4002 */
.
.
.

Note

• Objects accessed using this macro may not cross a 64KB segment boundary. For example, you cannot access a long variable at address 0x00FFFE.