Design and Implementation of a Unified Digital Clock and Stopwatch System Using FSM and Multiplexed Seven-Segment Display

Source : Verilog HDL

Proposed Abstract:

Digital clocks and stopwatches are widely used in daily applications such as consumer electronics, embedded devices, portable medical instruments, and time monitoring systems, as they provide simple and accurate time tracking functions. These systems offer advantages like low cost, user-friendly operation, and high reliability; however, they often face disadvantages such as hardware redundancy, higher power consumption, and limited integration when clock and stopwatch functions are implemented separately. The main problem addressed in this work is the lack of a unified architecture that can perform both digital clock and stopwatch operations using shared resources, which leads to inefficient hardware utilization and increased complexity in existing designs. Conventional systems generally use independent controllers and dedicated display drivers, resulting in additional overhead. To overcome this limitation, we propose a finite state machine based architecture that integrates both digital clock and stopwatch modules into a single design with common display hardware. The system employs multiplexers and control signals to switch seamlessly between clock and stopwatch modes, while states such as idle, hour, minute, second, and pause are clearly managed through FSM logic. The novelty of this work lies in the resource-sharing approach where a common seven-segment display is driven by multiplexed outputs, thereby reducing area, power, and switching complexity without compromising accuracy. The proposed design is implemented and tested using hardware description language coding and simulated on FPGA-based platforms, ensuring precise timing, functional correctness, and display reliability. Performance evaluation confirms that the system achieves efficient utilization of logic resources, accurate real-time operation, and flexibility for future extension in low-power VLSI and IoT-based applications.

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