Question

Name the ic which is used for communication purpose and why in 8259

Answer 1

Answer:

Here we see how can we use Programmable Peripheral Interface (PPI) IC 8255 for data transfer? As we know Programmable Peripheral Interface (PPI) IC 8255 is used to interface input and output device with microprocessor. The various methods of data transfer from the microprocessor to output devices or vice-versa has already been discussed in my earlier posts. Now we come to discuss a special interface circuits, known as peripheral interface circuits are to be used for this purpose. The interfacing devices (IC 8255) may be classified into two categories namely general purpose peripherals and special purpose peripherals.

Answer 2

Answer:

MAC232 Is the special integrated chip used for communication purpose. The reason why it is used in 8259 micro-controller is that it can be directly linked to the memory and can be easily accessed and therefore have a great variety of applications.

Other than communication, this integrated chip can also be used as a counter, computer memory, oscillator, timer. Since MAC232 can be used to convert signals such as RX, RTS, so it is also called dual receiver

Explanation: