Microprocessors and Microcontrollers

8253 Programmable Interval Timer

8253 Programmable Interval Timer: 8253 Programmable Interval Timer – In the process control system or automation industry, a number of operations are generally performed sequen­tially. Between two operations, a fixed time delay is specified. In a microprocessor-based system, time delay can be generated using software. Sequences of operations are also performed based on software. Therefore …

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8259A Programmable Interrupt Controller

8259A Programmable Interrupt Controller: 8259A Programmable Interrupt Controller – Microprocessor-based system design requires many I/O devices such as keyboards, displays, sensors and other components. These devices should receive servicing in an efficient manner from the CPU. The most common method of servicing such devices is known as the polled approach. In this approach, the processor …

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