The INDFn registers
are not physical registers. Any instruction that accesses an INDFn register actually
accesses the register at the address specified by the File Select Registers (FSR). If the
FSRn address specifies one of the two INDFn registers, the read will return
‘0’ and the write will not occur (though Status bits may be
affected). The FSRn register value is created by the pair FSRnH and FSRnL.
The FSR registers form a 16-bit address that allows an addressing space with 65536
locations. These locations are divided into three memory regions:
- Traditional/Banked Data Memory
- Linear Data Memory
- Program Flash Memory
Figure 1. Indirect Addressing