01․ The first machine cycle of an instruction is always
The first machine cycle of an instruction is always fetch cycle.
02․ The output data lines of microprocessor and memories are usually tristated because
Using tristate buffer, more than one device can transmit information over the data bus by enabling only one device at a time.
03․ The correct sequence of steps in the instruction cycle of a basic computer is
At first instruction is fetched then decoded and then read effective address and executed.
04․ Following is a 16-bit register for 8085 microprocessor
In a 8085 microprocessor Accumulator, register B & C are of 8-bit whereas stack pointer is a 16-bit register.
05․ The register which holds the information about the nature of results of arithmetic and logic operations is called as
In a microprocessor flag registers indicate status of an arithmetic and logic operation.
06․ When referring to instruction words, a mnemonic is
All instructions consist of opcode and operand where opcode indicates operation to be performed and operand is on which operation to be done. Opcode is always expressed as a short abbreviation which is nothing but mnemonic.
07․ While using a frequency counter for measuring frequency, two modes of measurement are possible:
- Period time
- Frequency mode
As we know crossover frequency is the half of oscillator frequency. i.e.
08․ In 8085 microprocessor system with memory mapped I/O, which of the following is true?
With the memory mapped I/O arithmetic and logic operations can be directly performed whereas with I/O mapped I/O it is not possible. Options A, B, C are valid for I/O mapped I/O.
09․ Consider the following statements: Arithmetic Logic Unit (ALU) 1.Performs arithmetic operations 2.Performs comparisons. 3.Communicates with I/O devices 4.Keeps watch on the system Which of these statements are correct?
ALU performs arithmetic and logical operations. Note: Comparison is a logical operation.
10․ Ready pin of microprocessor is used
Ready signal is used to provide proper wait state when processor is communicating with a slow peripheral device.