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)

Computer Science & Information Technology

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