This project focuses on designing a processor architecture for a basic calculator. The calculator supports both arithmetic and logical operations and interacts with input and output devices. Phase 1 involves the processor design, block diagram, hardware description, and interaction with I/O devices.

The processor includes the following components:

• Arithmetic Logic Unit (ALU): Handles arithmetic and logical operations (e.g., addition, subtraction, AND, OR).
• Control Unit (CU): Decodes instructions and manages control signals.
• Registers: Temporary storage for operands and results.
• Memory: Stores program instructions and data.
• I/O Interface: Interfaces with input (keypad) and output (LCD display) devices.

• ALU: Performs arithmetic and logical operations using basic logic gates and combinational circuits.
• Control Unit: Decodes keypad instructions and generates control signals.
• Registers: Stores operands, operator, and result.
• Memory: Stores program data for operations.

• User inputs numbers, operators, and commands.
• Includes a reset button.

• Displays intermediate and final results, including error messages.

The processor supports the following instructions:

• Load, Store, Add, Sub, Multiply, Divide, AND, OR, XOR, NOT, Exit.

This calculator operates in two modes:

1. Arithmetic Mode: Basic operations (+, -, *, /).
2. Logical Mode: Bitwise operations (AND, OR, XOR, NOT).

The program reads user inputs (two operands and an operator), performs the appropriate operation, and displays the result or error messages.

• LM016L LCD: 16x2 character LCD for displaying results.
• PIC16LF877 Microcontroller: Controls the calculator logic and manages I/O.
• 4x4 Matrix Keypad: Used for user input.
• Reset Button: Resets the calculator.

• LM016L LCD: Requires control and data lines for interfacing with the microcontroller.
• PIC16LF877: Manages input/output operations with peripherals like the keypad and LCD.

This project implements a simple calculator with both arithmetic and logical operation modes. It supports user input through a keypad and displays results on an LCD. The design includes an ALU, control unit, and memory, all integrated with the PIC16LF877 microcontroller.