Explain the 8259 microprocessor, Electrical Engineering

Assignment Help:

Explain the 8259 microprocessor.

8259:

The 8259A adds 8 vectored priority encoded interrupts to the microprocessor. This can be expanded to 64 interrupt requests with using one master 8259A and 8 slave units. CS and WR should be decoded. Other connections are direct to microprocessor.  The workings of pins are given here:

Pins D7 to D0: bidirectional data connection pins,

IR7 to IR0: Interrupt request, utilized to request an interrupt and connect to a slave in a system along with multiple 8259A.

WR: It connects to a write strobe signal (upper or lower in a 16 bit system) , 

RD: It connects to the IORC signal, 

INT: it Connects to the INTR pin on the microprocessor by the master and it is connected to a IR pin on a slave and 

INTA: It connects to the INTA pin on the microprocessor.  Within a system only the master INTA signal is associated

A0: it selects different command words along with in the 8259A,

CS: Chip select - It enables the 8259A for programming and control, 

SP/EN: Slave Program (that is 1 for master, 0 for slave)/Enable Buffer (as controls the data bus transceivers into a large microprocessor based system while in buffered mode) and 

CAS2-CAS0: It used as outputs from the master to the slaves in cascaded systems.

1564_8259.png

Figure: 8259 Block Diagram


Related Discussions:- Explain the 8259 microprocessor

What is the procedure of binary division, Q. What is the procedure of Binar...

Q. What is the procedure of Binary Division? The Binary division is the repeated process of subtraction, just as in decimal division. Signed Numbers Representation If w

Determine the regulation of three-phase, A three-phase, six-pole, wye-conne...

A three-phase, six-pole, wye-connected synchronous generator is rated at 550 V and has a synchronous reactance Xs = 2 . When the generator supplies 50 kVA at rated voltage and a p

The value of resistance in the regulator circuit, A zener regulator consume...

A zener regulator consumes a zener diode with an internal zener resistance of 5 ohm and the value of resistance in the regulator circuit is 82 ohm. If the supply voltage alters by

Dynamics of electrical machines, 1. Modeling of Armature and Field Controll...

1. Modeling of Armature and Field Controlled DC motors: Steady state and dynamic models; development of block diagrams;  assumptions used; complexity involved in realistic models;

Configured the dual processor architecture, Configured dual processor archi...

Configured dual processor architecture  In centralized SPC, dual processor architecture can be configured to operate in following one of three modes: 1.  Standby mode: In

Microprocessor, what is the function of CBW in the microprocessor

what is the function of CBW in the microprocessor

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