Digital Circuit and Microprocessor MCQs

Choose the correct one from among the alternatives A, B, C, D after matching an item from Group 1 with the most appropriate item in Group 2.Group 1-Group 2,P: Shift register, Q : Counter,1: Frequency division,R: Recoder,2: Addressing in money chips,3: Serial to parallel,data conversion

The Boolean expression AC + BC is equivalent to

11001, 1001 and 111001 correspond to the 2's complement representation of which one of the following sets of number?

The 8255 Programmable Peripheral Interface is used as described below.(I) An A/D converter is interfaced to a microprocessor through an 8255. The conversion is initiated by a signal from the 8255 on Port C.A signal on Port C causes data to be strobed into Port A.(II) Two computers exchange data using a pair of 8255s. Port A works as a bidirectional data port supported by appropriate handshaking signals.The appropriate modes of operation of the 8255 for (I) and (II) would be

The number of memory cycles required to execute the following 8085 instructions (I) LDA 3000 H,LXI D, FOF 1 H,would be

In the modulo-6 ripple counter shown in the given figure 7.27, the output of the 2-input gate is used to clear the J-K flip-flops. Oodc inputFig. 7.27 The 2-input gate is

Consider the sequence of 8085 instructions given below. LXI H, 9258, MOV A, M, CMA, MOV M,A Which one of the following is performed by this sequence?

A Boolean function f of two variables x and y id defined as follows :f(0,0) =f(0,1) = j(1,1) = 1;f(1,0) = 0 Assuming complements of x and y are not available, a minimum cost solution for realizing f using only 2-input NOR gates and 2-input OR gates (each having unit cost) would have a total cost of

It is desired to multiply the numbers OAH by OBH and store the result in the accumulator. The numbers are available in registers B and C respectively. A Part of the 8085 program for this purpose is given below :MVIA,00H,Loop;,LILT END,The sequence of instruction to the complete the program would be