What is the meaning of each of the P, U, B, W, and L bits in the encoding of an ARM memory reference instruction?
What will be an ideal response?
The figure illustrates the use of these bits in a memory reference instruction.
P determines the indexing mode (pre?indexed or post?indexed); that is, whether register updating occurs before
or after its use.
U is the up/down bit and indicates which way the pointer is to be moved (up or down).
B determines whether the data to be moved is an unsigned word or byte.
W determines whether the register is written back after use (i.e., autoindexing)
L is the load/store bit and determines the direction of data transfer (to or from memory)
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