Explain the operation of 8279, Electrical Engineering

Assignment Help:

Explain the operation of 8279.  Explain the following terms:

(i)  N key Roll over.

(ii)  Key board debounce.

(iii)  FIFO RAM.

Ans

The 8279 microprocessor is a programmable keyboard and display interfacing component which scans and encodes up to a 64-key keyboard and controls up to a 16-digit numerical display. This keyboard interface has built in first-in first-out buffer which allows this store up to eight keystrokes before the microprocessor should retrieve a character. There display section controls up to 16 numeric displays by an internal 16 X 8 RAM which stores the coded display information.

The keyboard sections contain eight lines which can be connected to eight columns of a keyboard, and also two additional lines with to shift and CNTL/STB keys. These key pressed are automatically debounced and the keyboard can function in two modes two key lock out or n-key rollover. When two keys in the two -key lock out mode are pressed concurrently, only first key is identified. In the N-key roll over mode, concurrent key are recognized and their codes are stored into the internal buffer.


Related Discussions:- Explain the operation of 8279

Determine the output voltage increment, (a) Design a 6-bit R-2 R ladder D/A...

(a) Design a 6-bit R-2 R ladder D/A converter. (b) For V ref = 10 V, find the maximum output voltage. (c) Determine the output voltage increment. (d) If the output voltag

Rectifiers and inverters, Normal 0 false false false EN...

Normal 0 false false false EN-IN X-NONE X-NONE RECTIFIERS AND INVERTERS

Thermal Transducers, what is the working of thermal transducers?

what is the working of thermal transducers?

Intrinsic material, Int r insic Material A perfect semicon...

Int r insic Material A perfect semiconductor crystal with no impurities or lattice defects. No carriers at 0 K, since the valence band is completely full and t

Why equalizing connection are used in lap winding dummy coil, Q.   Explain ...

Q.   Explain why equalizing connection are used in lap winding and dummy coils are some time used in wave winding. Sol.  For batteies operating in parallel, the circulating c

What do you understand by breakdown diodes, (a) Draw and illustrate the V-I...

(a) Draw and illustrate the V-I characteristics of PN junction diode. How the characteristics reflected with change in temperature? (b) Describe physically why a PN junction dio

If a single phase motor fails to run, Q. If a single phase motor fails to r...

Q. If a single phase motor fails to run or start slow what action to be taken. Ans: If it is not starting check the supply and test the winding if it found normal check

Determine kva rating of the auto - transformer, Q. A 15-kVA, 2200:220-V, tw...

Q. A 15-kVA, 2200:220-V, two-winding, single- phase transformer is connected as an autotrans- former to step up voltage from 220 V to 2420 V. Without exceeding the rated current of

Voltmeter transistor, explain basic working of voltmeter transistor

explain basic working of voltmeter transistor

Dc machine, why very high resistance wire is used is field windind and low ...

why very high resistance wire is used is field windind and low resistance wire is used in armature winding in DC shunt machine?

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