Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Explain keyboard interfacing to 8088 through 8279.
The 8279 is a programmable keyboard and display interfacing component which scans and encodes up to a 64-key keyboard and controls up to a sixteen-digit numerical display.
The keyboard interface has built in first-in first-out (FIFO) buffer which allows this store up to eight keystrokes before the microprocessor should retrieve a character. The display section controls up to sixteen numeric displays from an internal 16 X 8 RAM which stores the coded display information.
The keyboard section has eight lines that can be connected to eight columns of a keyboard, in addition two additional lines including shifting and CNTL/STB keys. The key pressed are automatically de-bounced and the keyboard can operate into two modes two as: key lock out or n-key rollover. When two keys in the two as key lock out mode are pressed concurrently, only first key is known. In the N-key roll over mode, simultaneous key are known and their codes are stored into the internal buffer.
Control Word: 000DDMMM - Mode set is command with an op-code of 000 and two fields programmed to choose the mode of operation for the 8279. The DD field chooses the mode of operation for the display and the MMM field decides the mode of operation for the keyboard.
The 8279 control word summary
Q. Applications of operational amplifiers? An op amp along with a few external components (resistors and capacitors) is capable of performing many different operations-hence th
Q. The input to the differentiator circuit is a sinusoidal voltage of peak value 5mv and frequency 1kHZ. find out the output if R=100K and C=10^-6F Solution. The equation
Q Find the diameter of a circular waveguide that will have a lower cutoff frequency of 10 GHz and also specify its largest usable frequency.
Example of binary subtraction of Negative number Case 2. Negative number is more than the positive number ( i e, answer is negative) Example : Subtract 92 10 ( 101
Q. Diagram, explain the construction of a single stage RC coupled amplifier? An RC Coupled amplifier consists of a transistor connected in the emitter configuration with neces
Q For the circuit of Figure: (a) Find an expression for the power absorbed by the load as a function of R . (b) Plot the power dissipated by the load as a function of th
Q. Explain working of three-phase transformers? Transformation in three-phase systems can be accomplished in either of two ways: (1) connecting three identical single-phase tra
Q. What is meant by thermal runaway in a transistor ? When current flows through the collector circuit, it produces heat at the collector junction. This increases the temperatu
. In successive-approximation A/D converter, offset voltage equal to 1/2LSB is added to theD/A converter’s output. This is done to
Q. Determine v, i, and the power delivered to elements in the network given in Figure. Check whether conservation of power is satisfied by the circuit.
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd