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Far Memory

The far memory area represents the full address range of the 251. The far memory area is represented at the assembly language level with the memory classes HDATA or HCONST.

Variables defined with memory type far are accessed using indirect addressing. The address calculation is 16 bits only and limits therefore the data object size of far objects to 64KB. However, far variables may reside anywhere in the memory which allows a total size of up to 16 Mbytes.

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