D82C54: Based on working principles, functions and applications

The D82C54 is a programmable interval timer/counter (PIT) integrated circuit manufactured by Rochester Electronics. It is a versatile timer and counter device designed to be interfaced with microprocessors or embedded systems to facilitate precise timekeeping, timing functions, and event counting. Here’s an overview of its working principles, functions, and typical applications:


Working Principles:

The D82C54 is based on the principle of a counter and timer. It contains three 16-bit programmable interval timers, each of which can be configured to operate independently in either timer or event counter mode. The device is designed to be programmed by the host system to perform specific timing operations based on the provided instructions.


  1. Programmable Timing: The D82C54 can be programmed to generate precise timing intervals, making it suitable for a wide range of time-dependent applications.

  2. Counter Operations: It can also function as a versatile counter, registering and managing event occurrences or frequency measurements.

  3. Three Independent Timers: The chip contains three independent 16-bit interval timers, allowing multiple timing functions to be performed simultaneously.

  4. Clock Inputs: The D82C54 can accept an external clock signal, enabling synchronous operations based on an external time reference.

  5. Control and Status Registers: The device includes control and status registers that allow it to be configured and monitored by the host system.

  6. Cascade Mode: It supports cascade mode, where multiple D82C54 chips can be linked together to extend timer functionality through chaining.


  1. Real-time Clocks: The D82C54 can be used in systems that require real-time clock functionality, such as event scheduling, time-stamping, and synchronization.

  2. Industrial Automation: It has applications in industrial automation systems for managing precise timing operations, synchronization of equipment, and event tracking.

  3. Embedded Systems: Employed in embedded systems for applications such as timing critical tasks, scheduling, and generating time-based interrupts.

  4. Communication Systems: Used in communication systems for controlling protocol timing, data transmission/reception timing, and synchronization in networking equipment.

  5. Test and Measurement Equipment: It’s utilized in test and measurement instruments for generating accurate time bases, event timing, and frequency measurements.

  6. Control Systems: Integrated into control systems in various industries to manage and synchronize processes, control equipment, and coordinate events accurately.

  7. Military and Aerospace Applications: Found in military and aerospace systems for managing timing functions, synchronization, and event triggering in critical operations.

Additional Considerations:

When using the D82C54 in a design, it’s important to refer to the datasheet and technical reference materials provided by the manufacturer to ensure proper interfacing, signal timing, and operating characteristics. Careful consideration of clock sources, input/output configurations, and programmable settings is necessary to achieve accurate and reliable timing and counting operations tailored to the specific application requirements.

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