Sequential-EE

A MOD-2 and a MOD-5 up-counter when cascaded together results in a MOD _________ counter. (in integer).

The maximum clock frequency in MHz of a 4-stage ripple counter, utilizing flip-flops, with each flip-flop having a propagation delay of 20 ns, is ________. (round off to one decimal place).

A 16 -bit synchronous binary up-counter is clocked with a frequency $f_{c l k}$. The two most significant bits are ORed together to form an output $Y$. Measurements shows that $Y$ is periodic and the duration for which $...

A counter is constructed with three D flip-flops. The input-output pairs are named as $\left(D_0, Q_0\right)$, $\left(D_1, Q_1\right)$ and $\left(D_2, Q_2\right)$, where the subscript 0 denotes LSB. The output sequence i...

An $$8$$-bit, unipolar Successive Approximation Register type $$ADC$$ is used to convert $$3.5$$ $$V$$ to digital equivalent output. The reference voltage is $$+5 V.$$ The output of the $$ADC,$$ at the end of $$3$$rd clo...

A cascade of three identical modulo -$$5$$ counters has an over all modulus of

In $$8085A$$ microprocessor, the operation performed by the instruction $$LHLD$$ $${2100_H}$$ is

A portion of the main program to call a subroutine $$SUB$$ in an $$8085$$ environment is given below: $$\eqalign{ & LXI\,\,\,\,\,\,\,\,\,\,\,\,\,D\,\,\,DISP \cr & LP\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,CALL\,\,\,SUB \cr} $$ It...

When a $$''CALL$$ $$addr'$$ instruction is executed, the $$CPU$$ carries out the following sequential operations internally. Note: $$(R)$$ means content of register $$R$$ $$\left( {\left( R \right)} \right)$$ means conte...

In $$8085$$ microprocessor, the contents of the Accumulator, after the following instructions are executed will become $$\eqalign{ & XRA\,\,\,A \cr & MVI\,\,\,B\,\,\,F0\,\,\,H \cr & SUB\,\,\,B \cr} $$

An input device is interfaced with Intel $$8085$$ $$A$$ microprocessor as memory mapped $${\rm I}/O,$$ the address of the device is $$2500H.$$ In order to input data from the device to accumulator, the sequence of instru...

Which one of the following statements regarding the $$INT$$ (interrupt) and the $$BRQ$$ (bus request) pins in a $$CPU$$ is true?

In an $$8085$$ $$A$$ microprocessor based system, it is desired to increment the contents of memory location whose address is available in $$(D,E)$$ register pair and store the result in same location. The sequence of in...

The $$8085$$ assembly language instruction that stores the content of $$H$$ and $$L$$ registers into the memory locations $$2050H$$ and $$2051H,$$ respectively, is

The following program is written for an $$8085$$ microprocessor to add two bytes located at memory addresses $$1FFE$$ and $$1FFF$$ $$\eqalign{ & LXI\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,H,\,\,\,1FFE \cr &...

When a program is being executed in an $$8085$$ microprocessor, its Program Counter contains

An Intel $$8085$$ processor is executing the program given below. $$\eqalign{ & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,MVIA,\,\,10H \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\...

Among the following four, the slowest $$ADC$$ (analog-to-digital converter) is

Which one of the following is not a vected interrupt?

A dual-slope analog-to-digital converter uses an $$N$$-bit counter. When the input signal $${V_a}$$ is being integrated, the counter is allowed to count up to a value:

In a microprocessor, the address of the next instruction to be executed, is stored in

In an $$8085$$ microprocessor, after the execution of $$XRA$$ $$A$$ instruction

For a $$J$$-$$K$$ flip-flop its $$J$$ input is tied to its own $$Q$$ output and its $$K$$ input is connected to its own $$Q$$ output. If the flip-flop is fed with a clock of frequency $$1$$ $$MHz,$$ its $$Q$$ output freq...

The stack pointer of a microprocessor is at $$A001H.$$ At the end of execution of following instructions, the value of stack pointer is _____________ $$\eqalign{ & PUSH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,PSW \cr & XTHL \cr &...

The contents of the accumulator in an $$8085$$ microprocessor is altered after the execution of the instruction.

Three devices $$A,$$ $$B$$ and $$C$$ have to be connected to a $$8085$$ microprocessor. Device $$A$$ has highest priority and device $$C$$ has the lowest priority. In this context which of the following is correct assign...

If the $$HLT$$ instruction of a $$8085$$ microprocessor is executed,