Purpose: To understand the restrictions related with data shifting.
Problem
Shift a block of 8 bytes of data, presently located from 50H to 57H, 1 byte up, so that the data is available
from 51H to 58H.
Solution
e diff erence between copy block and shift block is that there is no overlapping in former, which exists in
the latter. Moreover, shift-up and shift-down are to be treated in a slightly diff erent manner. Otherwise, the
usage of pointers and the counter is identical (refer to Fig. 7.2) in both cases. Here also R0 and R1 are used as
pointers and R7 is used as the counter. Following ar
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