How 8255 programmable peripheral interface can operate, Electrical Engineering

Assignment Help:

What are the different modes in which 8255 Programmable Peripheral Interface (PPI) can operate?

Twenty Four I/O lines in 38-bit port groups - A, B and C
A and B can be 8-bit input/output ports
C can serve as twenty four-bit input /output ports
3 modes of operation:

- Mode 0: A, B, C simple input / output level sensitive ports

- Mode 1: A, B input / output ports along with strobe control in C

- Mode 2: A is bidirectional along with control/handshake in B and C

A, B can only modify 1 byte at a time
C has individual bit set/reset ability
Improvement is non-dedicated circuit can change port configuration along with software and no "glue logic"
Ports A, B and C are utilized for I/O data.
The control register is programmed to choose the operation mode of the three ports A, B and C.
Mode 0: simple I/O mode
Any of the ports A, B, CL and CU can be programmed as input / output.
No control of individual bits (all bits are out or in

Related Discussions:- How 8255 programmable peripheral interface can operate

Express the storedmagnetic energy, A relay is essentially an electromechani...

A relay is essentially an electromechanical switch that opens and closes electrical contacts. A simplified relay is represented in Figure. It is required to keep the fenomagnetic p

Microprocessor, Write a program to count how many from your data set called...

Write a program to count how many from your data set called MYDATA, which is a set of signed single-byte numbers, has positive value and are odd numbers. Save the result in POSOD

Dielectric heating - stepper motor , Dielectric Heating Dielectric l...

Dielectric Heating Dielectric losses occur in insulating materials. These are same as hysteresis losses in magnetic materials. When an alternating electric field is a

Lc filter, LC Filter To the load resistance R L the ripple factor i...

LC Filter To the load resistance R L the ripple factor is directly proportional in the inductor filter and inversely proportional to R L in the capacitor filter. Hence i

Common-drain jfet amplifier, Q. Common-Drain JFET Amplifier? Figure (a)...

Q. Common-Drain JFET Amplifier? Figure (a) shows a CD JFET amplifier in which resistors R 1 , R 2 , and R SS are selected by the bias design, and capacitors CG and CS are chos

Determine the input resistance between terminals of circuit, Q. Consider Fi...

Q. Consider Figure of the weighted differencing amplifier. Let R 3 = R 1 and R 4 = R 2 . Determine the input resistance between terminals a and b of the circuit.

Find the effective noise temperature, Q. An antenna with an effective noise...

Q. An antenna with an effective noise temperature of 130 K couples through a waveguide that has a loss of 0.8 dB to a receiver. Find the effective noise temperature presented by th

4-bit magnetude converter thyory, 4-bit magnetude converter thyory

4-bit magnetude converter thyory

Advantages and disadvantages of direct coupled coupling, Q. Mention the adv...

Q. Mention the advantages and disadvantages of direct coupled coupling? Advantages: 1.Simple circuit due to minimum use of resistor 2.Low

Nand gate - introduction to microprocessors , NAND Gate NAND means NO...

NAND Gate NAND means NOT AND it complements the output of an AND gate. The symbol of NAND by a NOT gate. Generally Not operation is represented by a bubble as shown

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages