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

Example of high resistivity material, Example of high resistivity material ...

Example of high resistivity material is (A) Nichrome (B) Silver (C) Gold (D) Copper Ans: Nichrome is example of high resistivity

Explain internal data bus, Q. Explain Internal Data Bus? Internal Data ...

Q. Explain Internal Data Bus? Internal Data Bus: A bus which operates only within internal circuitry of the CPU, communicating among internal caches of memory which are part of

Design of a p only controller, For an operating point half way up the paral...

For an operating point half way up the parallel section and the discharge valve and the discharge fully open, design a proportional only controller which will give closed loop dyna

Advanced mobile phone system, Q. Advanced Mobile Phone System? Cellular...

Q. Advanced Mobile Phone System? Cellular systems employed cells with a radius in the range of 5-18 km. The base station usually transmitted at a power level of 35 W or less, a

Give a brief description of integrating circuits, Q. Give a brief descripti...

Q. Give a brief description of integrating circuits ? Integration is a summation of area. An integrating circuit produces an output voltage which is proportional to the area en

Explain ionic polarisation, Explain ionic polarisation. Ionic Polaris...

Explain ionic polarisation. Ionic Polarisation: It takes account of the fact that while some of the atoms in a molecule contain an excess positive or negative charge that of

In what way is program control superior to wired control, Q. Classify switc...

Q. Classify switching systems. In what way is stored program control superior to hard wired control? Ans: Classifications of switching systems are givenin block diagram belo

What is the function of mode set register in 8257, What is the function of ...

What is the function of mode set register in 8257? The mode set register is used for programming the 8257 as per the needs of the system. The function of the mode set register

Draw the logic diagram of an sr latch, Q. Draw the logic diagram of an SR l...

Q. Draw the logic diagram of an SR latch using only NAND gates, and obtain the truth table for that implementation.

Define flash analog to digital converters, Define Flash Analog to Digital C...

Define Flash Analog to Digital Converters? Parallel flash ADCs transform the analog input voltage faster as compared to other types of ADCs. They compare the voltage in parall

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages