What is the function of the ports in a microprocessor?

The port connects the CPU to a peripheral device via a hardware interface or to the network via a network interface.

What is the function of 8255 in microprocessor?

Function. The 8255 gives a CPU or digital system access to programmable parallel I/O. The 8255 has 24 input/output pins. These are divided into three 8-bit ports (A, B, C).

What are the functions of port in 8255 PPI?

PPI 8255 is a general purpose programmable I/O device designed to interface the CPU with its outside world such as ADC, DAC, keyboard etc. We can program it according to the given condition. It can be used with almost any microprocessor. It consists of three 8-bit bidirectional I/O ports i.e. PORT A, PORT B and PORT C.

What are the uses of 8255?

8255 is a popularly used parallel, programmable input-output device. It can be used to transfer data under various condition from simple input-output to interrupt input-output.

How many ports are there in 8085 microprocessor?

256
The 8085 supports up to 256 input/output (I/O) ports, accessed via dedicated Input/Output instructions—taking port addresses as operands.

What are the alternate functions of the I O ports of 8051?

8051 microcontrollers have 4 I/O ports each of 8-bit, which can be configured as input or output. Hence, total 32 input/output pins allow the microcontroller to be connected with the peripheral devices. Pin configuration, i.e. the pin can be configured as 1 for input and 0 for output as per the logic state.

What ports are available in Group A of 8255?

8255A has three ports, i.e., PORT A, PORT B, and PORT C. Port A contains one 8-bit output latch/buffer and one 8-bit input buffer.

In which mode do all the ports of 8255?

I/O mode
Solution: In the I/O mode, the 8255 ports work as programmable I/O ports.

Which signal of 8255 is used for the selection of port?

A port inside the 8255 is selected for communication by the 8085 by the address-input pins A1 and A0, as shown in the above table. The direction of data transfer is dictated by the RD* and WR* input signals.

How many ports are there in microprocessor?

Thus we can have 2 8 = 256 input ports and 256 output ports are possible in 8085-based microcomputer. IN and OUT both are 2-Bytes instructions….Addressing of I/O Ports in 8085 Microprocessor.

Mnemonics, Operand	Opcode (in HEX)	Bytes
IN Port-address	DB	2
OUT Port-Address	D3	2

What is Port address in microprocessor?

Alternatively referred to as I/O address, I/O port, and I/O port address, the input/output port is a memory address used by software to communicate with hardware on your computer. In your computer there are 65,536 memory ports that are numbered from 0000h to FFFFh.

What is the importance of ports in a microcontroller?

The microcontroller has five sets of I/O pins (16 pins per set) called ports to be used as inputs or outputs for electrical signals. Each I/O pin can have different properties to accommodate the desired type of a signal. In addition, each I/O pin can have one from a set of 16 predefined alternative functions.

What are the operating modes of 8255 microprocessor?

8255 microprocessor operating modes Bits Function D3 1 when higher nibble of port C is taking D2 It tells the mode of Port B. For 0, it i D1 1 when port B is taking input, 0 when po D0 1 when lower nibble of port C is taking

What is Programmable Peripheral Interface 8255?

Programmable peripheral interface 8255. PPI 8255 is a general purpose programmable I/O device designed to interface the CPU with its outside world such as ADC, DAC, keyboard etc. We can program it according to the given condition. It can be used with almost any microprocessor. It consists of three 8-bit bidirectional I/O ports i.e.

How many I/O ports are there in 8255A?

It consists of three 8-bit bidirectional I/O ports (24I/O lines) which can be configured as per the requirement. Ports of 8255A 8255A has three ports, i.e., PORT A, PORT B, and PORT C. Port A contains one 8-bit output latch/buffer and one 8-bit input buffer.

What is the function of 8255?

The 8255 is a general purpose programmable IO device. It is designed to interface the CPU with some external devices like ADC, DAC, keyboard etc. We can program the device according to the given condition. There are three 8-bit bi-directional IO ports. The Port-A, Port-B and Port-C. These ports are assigned as input or output port.