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

#kinetic energy, how does the increase in the kinetic energy of a proton co...

how does the increase in the kinetic energy of a proton compare with the increase in kinetic energy of the alpha particle in part?

Power distribution, Determine the current through each parallel branch of t...

Determine the current through each parallel branch of the system

Lhld load hl pair direct instruction, LHLD  Load  HL Pair Direct  Instru...

LHLD  Load  HL Pair Direct  Instruction This  instruction is used to copy the  content  of memory  location specified  by opened  in register L  and copy the content of next  m

Determine downink of a cdma system, Consider the point-to-point radio link ...

Consider the point-to-point radio link introduced in problem 9. By how much must transmit power be increased to maintain the maximum BER of 10-5 if the channel is flat Rayleigh-fad

Explain direct data addressing mode, Direct data addressing mode (with exam...

Direct data addressing mode (with examples) available in microprocessors. Direct Mode: Instruction comprises memory access. CPU accesses which location into memo

Switching, With neat diagrams explain the configuration of a step-by-step s...

With neat diagrams explain the configuration of a step-by-step switching system

Find transmission bandwidth required of telemetry system, Find the transmis...

Find the transmission bandwidth required of a data telemetry system that is to handle three different signals with bandwidths W 1 = 1 kHz, W 2 = 2 kHz, and W 3 = 3 kHz, by emplo

Control systems, Hi, What is the time response for a closed loop transfer f...

Hi, What is the time response for a closed loop transfer function:H(s) = 10/(s^2 +s +1) to delta function input?

Determine the h-parameters for the network., Q. A negative impedance conver...

Q. A negative impedance converter circuit shown in Figure is used in some applications where inductors cannot be utilized or where negative resistance is beneficial. (a) Determi

Program analysis , Program Analysis We have to find the greater of two...

Program Analysis We have to find the greater of two given  number. We  can store the given  numbers  in two  different  registers ( suppose register A and B). Then we will com

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