This format is similar to register to register transfer. The difference is in MOD field.

For register to register, MOD = 11

For register to/from memory with no displacement, MOD = 00.

When MOD= 0 0, the r/m fields indicates the address to memory location.

As for example r/m = 1 1 1 indicates ( BX)

The instruction

1 0 0 0 1 0 1 0 0 0 0 0 0 1 1 1 indicates the instruction MOV AX, [BX]

In hexadecimal, the instruction is

Here the data is present in a memory location in DS whose offset address is in BX . The effective address of the data is given as