Question $4$

$\frac{0}{7}$

A $16-$bit microprocessor instruction that uses indexed $($displacement$)$ addressing has $5$ bits for the opcode, $3$ bits to specify the register used and the remaining bits provide the index for the required memory address.

The binary code for the instruction is:

$1011010111001010$

The instruction must read data from memory address $2$B$5$FH$.$

Determine the decimal value of the number that needs to be in the register that is used.