Write a code in the appropriate assembly language for the PIC$16$F$877$ that receives the data from the button matrix, that will read the two operands and the OP CODE

Here is a general sketch of the required code:

Initial settings: setting the input and output legs, the starting zero, and other settings that are required to work with the button matrix.

Receiving the data: writing a loop that checks which key was pressed and reading the value from the corresponding key.

Decoding the data: after receiving the operands and the OP CODE, the received command must be decoded and the system prepared to perform the required operation.

Performing the operation: writing the logic for each of the commands according to the OP CODE.

Write code for each step above