Illustrate about 8259, Computer Engineering

Assignment Help:

Illustrate about 8259

8259A adds 8 vectored priority encoded interrupts to the microprocessor. We can expand it to 64 interrupt requests by using one master 8259A and 8 slave units. CS and WR should be decoded. Other connections are direct to microprocessor. 

Pins D7 - D0: the bidirectional data connection, IR7 - IR0: Interrupt request, used to request an interrupt and connect to a slave in a system with multiple 8259A.

WR:-Connects to a write strobe signal (upper or lower in a 16 bit system), RD: - Connects to IORC signal, INT: - Connects to INTR pin on the microprocessor from the master and is connected to an IR pin on a slave and INTA: - Connects to INTA pin on the microprocessor.  In a system only master INTA signal is connected A0:- Selects different command words with in the 8259A, CS: - Chip select - enables 8259A for programming and control, SP/EN: - Slave Program (1 for master, 0 for slave)/Enable Buffer (controls data bus transceivers in a large microprocessor based system when in buffered mode) and CAS2-CAS0:- Used as outputs from the master to slaves in cascaded systems. 

 

2064_micro.png

                                                            Figure: 8259 Block Diagram


Related Discussions:- Illustrate about 8259

What is the advantages for linux, What is the advantages for Linux? ...

What is the advantages for Linux? Runs on old Hardware Low-Cost Linux is fully customizable in all its components Powerful Linux runs on low-end, cheap hardware

Microprocessor, illustration of Z80 instruction set Computer

illustration of Z80 instruction set Computer

State about the machine language programs, State about the machine language...

State about the machine language programs The computer can run only machine language programs, one needs to translate above programs to machine language programs. To translate

Define virtual memory, Normal 0 false false false EN-IN...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

What will be its digital output of an 8-bit ADC, An 8-bit successive approx...

An 8-bit successive approximation ADC has a resolution of 20mV.  What will be its digital output for an analog input of 2.17V? Ans: Given data Resolution =20mv Analog input =2.

What is CRC, In a frame transmission, CRC stands for? CRC stands for Cy...

In a frame transmission, CRC stands for? CRC stands for Cyclic Redundancy Check, in a frame transmission.

Variable or compound expression - unification algorithm, Variable or compou...

Variable or compound expression - Unification algorithm: Here some things to note regarding this method are:  (i) There if really trying to match a constant to a different

Cohesion assignments, what can be different assignments given on this topic...

what can be different assignments given on this topic?

Cn, What is the basic requirement for establishing VLANs?

What is the basic requirement for establishing VLANs?

Three different types of convergences, Three dissimilar types of convergenc...

Three dissimilar types of convergences are: 1.  The convergence of e-commerce and wireless technology  2.  The Convergence of E-Commerce and IP Business-Grade Messaging 3

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd