8259

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The 8259 programmable interrupt controller (PIC) is a type of chip that enables line by line line prioritization, masking of external sources, and vector fetching of interrupts, allowing for higher performance computing and better utilization of system resources. The 8259 PIC has been employed in many types of computer systems, from embedded systems to large distributed systems. This article will discuss the application fields of the 8259 PIC and its working principle.

Application Fields of 8259

The 8259 PIC has been widely used in many application fields. One of its primary uses has been in embedded systems, such as microcontrollers and industrial machines. The 8259 PIC can provide reliable and understandable connection point between the microcontroller and the external hardware. It can also provide interrupts to microcontrollers, allowing applications to respond quickly and reliably to external signals.

The 8259 PIC has also been used in large distributed systems such as networks. As a programmable interrupt controller, the 8259 PIC can provide a way of partitioning a distributed system into smaller logical parts. This way, different tasks can be logically split up and allocated its own segment of memory and resources. This allows for improved performance by distributing tasks and resources to multiple nodes in the network.

The 8259 PIC has also been used in computer peripherals, such as keyboards, mice, and printers. It can be used to detect when a peripheral signal is about to be sent or received. It also provides a means for controlling the devices and the peripherals connected to them. As a result, it allows for better utilization of system resources and a smoother functioning of the device.

Working Principle of 8259

The 8259 PIC works by enabling line by line prioritization, masking of external sources, and vector fetching of interrupts. This is accomplished by using a priority encoder. The encoder assigns each device connected to the PIC with a priority from highest to lowest. This ensures that all devices receive the interrupts they need in the order that they are placed in the specific set of instructions.

Once this is programmed, the 8259 PIC can be used to detect when inputs are sent to the device. When this happens, the PIC interrupts the CPU with a specific vector that indicates the device to be serviced. The vector is specified by the encoding of the specific instruction set.

The 8259 PIC can also be used to mask certain external signals. This can be useful in certain situations where specific signals need to not be serviced. As such, the 8259 PIC determines which signals should or should not be serviced, allowing for greater control over the process.

Finally, the 8259 PIC can be used for vector fetching of interrupts. This is accomplished by using a vector-based table lookup. This allows for quick and efficient communication between the PIC and the CPU, resulting in quicker and more efficient servicing of the device.

Conclusion

The 8259 PIC is a powerful tool for controlling and managing computer peripherals, embedded systems, and distributed systems. Its ability to enable prioritization, mask external signals, and fetch interrupt vectors makes it an invaluable tool for managing device hardware and improving system performance. As such, it is one of the most widely used programmable interrupt controllers in the industry.

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