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Reading the INDF register itself, indirectly (FSR = ’0’), will read 00h. Writing to the INDF register indirectly, results in a no operation.
...и чуть далее...
If INDF0, INDF1 or INDF2 are read indirectly via an
FSR, all ’0’s are read (zero bit is set). Similarly, if
INDF0, INDF1 or INDF2 are written to indirectly, the
operation will be equivalent to a NOP instruction and the
STATUS bits are not affected.
...
(PIC18CXX2 Data Sheet DS39026C-page 50)
в общем случае nop никому не помешает, но если обрабатывается вычисляемый переход, то зависание почти всегда гарантировано.
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