Unlock The Mysteries Of 8255: Learn How To Connect Pins Of A Microcontroller

Unlock the Mysteries of 8255: Learn How to Connect Pins of a Microcontroller

Have you ever wondered which pins of a microcontroller are directly connected with 8255? If so, you’ve come to the right place! 8255 is a device used in microprocessor-based systems to provide additional input/output ports. In this article, we’ll explore the 8255 chip and discuss which pins of a microcontroller are directly connected with it.

What is 8255?

8255 is an independent input-output device that is used to expand the I/O capabilities of a microcomputer. It is an important part of a microcomputer system and is used in many embedded applications. It is a programmable peripheral interface (PPI) which can be used to access multiple ports and can interface with various external devices. 8255 is a 40-pin integrated circuit that can be connected to a microprocessor using an 8-bit bus. It can be used to control several ports, each with 8-bit I/O capability.

Working of 8255

The 8255 chip is composed of three 8-bit ports, each of which can be used for data input/output. It is a programmable device, which means that it can be programmed to perform certain operations such as input, output, and timing. The 8255 chip has a control register, which contains instructions for the chip. The control register is used to select the type of operation that the chip should perform. The chip also has two 8-bit ports (Port A and Port B), which are used to connect to external devices.

Which Pins of a Microcontroller are Directly Connected with 8255?

The 8255 chip has a total of 40 pins, which are divided into four groups. The first group consists of 8 pins which are used for data input/output. These pins are connected directly to the microcontroller's I/O bus. The second group of 8 pins are used to control the chip's various operations. The third group of 8 pins is used to provide power to the chip. Finally, the last group of 16 pins is used to connect to external devices.

Conclusion

In this article, we have discussed the 8255 chip and which pins of a microcontroller are directly connected with it. 8255 is a programmable device which can be used to expand the I/O capabilities of a microcomputer. It has three 8-bit ports and a control register, which can be used to select the type of operation that the chip should perform. The 8255 chip has a total of 40 pins, which are divided into four groups. Finally, the first group of 8 pins is connected directly to the microcontroller's I/O bus.

Electronics