To conclude the discussions about communication between the external data memory and the accumulator,
it may be pointed out that the operation becomes more straightforward when the DPTR is used. However,
DPTR may only be incremented and cannot be decremented by 16-bit. On the other hand, usage of R0 or
R1 would demand a prior use of another port other than P0 to hold the higher byte of the 16-bit address.
However, in this case, the registers off er both incrementing and decrementing features, which might be
appropriate for some data transactions within a limit of 256 bytes. Otherwise, both types of instructions need ...
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