What is the role of a program counter?

The program counter (PC) is a register that manages the memory address of the instruction to be executed next. … The CPU reads the address where the instruction to be executed next is stored from the PC and executes it in sequence.

What is the use of program counter register?

A register in the control unit of the CPU that is used to keep track of the address of the current or next instruction. Typically, the program counter is advanced to the next instruction, and then the current instruction is executed.

What is the role of counter in the operation of microprocessor?

The function of the program counter is to point to the memory address of the next instruction to be executed. When an opcode is being fetched, the program counter is incremented by one to point to the next memory location.

What is the role of the program counter and the instruction register in the machine cycle?

The program counter (PC) holds the address of the next instruction to be executed, while the instruction register (IR) holds the encoded instruction.

What is the function of program counter in 8051?

The Program Counter (PC) is a 2-byte address which tells the 8051 where the next instruction to execute can be found in the memory. PC starts at 0000h when the 8051 initializes and is incremented every time after an instruction is executed.

What is the role of program counter in 8085 microprocessor?

The function of the program counter is to point to the memory address from which the next byte is to be fetched. When a byte (machine code) is being fetched, the program counter is incremented by one to point to the next memory location.

What is program counter Class 11?

A program counter (PC) is a CPU register in the computer processor which has the address of the next instruction to be executed from memory. It is a digital counter needed for faster execution of tasks as well as for tracking the current execution point.

What does the MAR do?

In a computer, the memory address register (MAR) is the CPU register that either stores the memory address from which data will be fetched to the CPU, or the address to which data will be sent and stored. … MAR holds the memory location of data that needs to be accessed.

What value does the program counter hold?

program counter – holds the memory address of the next instruction to be fetched from main memory. memory address register (MAR) – holds the address of the current instruction that is to be fetched from memory, or the address in memory to which data is to be transferred.

Which instruction affects program counter?

Usually, the PC is incremented after fetching an instruction, and holds the memory address of (“points to”) the next instruction that would be executed. Processors usually fetch instructions sequentially from memory, but control transfer instructions change the sequence by placing a new value in the PC.

What is example of program counter?

A program counter is a register in the CPU containing the address of the next instruction to be executed from memory. For example, when your computer is turned on, a signal places the decimal number F000 into the CPU. This action tells the computer to look at the first instruction on the motherboards flash memory chip.

What kind of instructions usually affect the program counter?

24. What kind of instructions usually affect the program counter?
  • Push & Pop.
  • Call & Jump.
  • Call & Return.
  • Return & Jump.

What is true about program counter?

What is true about Program counter? A. It is an 8-bit register, which holds the temporary data of arithmetic and logical operations. … Explanation: Program counter : It is a 16-bit register used to store the memory address location of the next instruction to be executed.

What is program counter in computer architecture?

A program counter (PC) is a CPU register in the computer processor which has the address of the next instruction to be executed from memory. It is a digital counter needed for faster execution of tasks as well as for tracking the current execution point.

What is the purpose of PC <- PC 1?

The Parametron Computer 1 (PC-1) was a binary, single-address computer developed at Professor Hidetosi Takahasi’s Laboratory at the Department of Physics, University of Tokyo, and was one of the first general purpose computers that used parametron components and dual frequency magnetic-core memory.

What is the function of program counter Mcq?

The program counter holds the memory address of the next instruction to be executed, whereas, the address of the instruction in execution is stored in Memory Address Register (MAR).

Why program counter is 16-bit register?

The program counter acts as a pointer to the next instruction to be executed and always contains the 16-bit address of the memory location of next instruction. It is a 16 bit register as 8085 has 16 address lines.

When STC instruction is executed?

While STC instruction executes, only carry flag will be affected. all flags will be affected. only carry and zero flags will be affected.

Why do we need a ULN2803 in driving a relay?

Why do we need a ULN2803 in driving a relay? Explanation: We need a ULN2803 for driving a relay because the relay coil requires 10mA or more current to be energized. If microcontroller pins are not able to provide sufficient current to drive relays then we need ULN2803 for driving relays.

Which of the following is true while executing data transfer instructions?

Discussion Forum
Que. Which of the following is true while executing data transfer instructions?
b. restricted bit-transfer operations are allowed
c. both operands can be direct/indirect register operands
d. all of the mentioned
Answer:both operands can be direct/indirect register operands

When the microcontroller executes some arithmetic operations then the flag bits which register are affected of?

Discussion Forum
Que. When the micro controller executes some arithmetic operations, then the flag bits of which register are affected?
b. SP
c. DPTR
d. PC
Answer:PSW

Why do we need a ULN2803 in driving a relay 1 point for switching a motor for increasing the current for increasing the power for switching the voltage?

We need a ULN2803 for driving a relay because more current is generally required for driving a relay that is generally not provided by a micro controller, so we need a ULN2803 to increase the current limit.

Why are two pins for ground available in ADC0804?

Why two pins for ground are available in ADC0804? Explanation: Two grounds are available in ADC0804 to isolate analog signal from digital signal. This isolation provides accuracy in digital output. 2.

What is the function of the SCON register?

What is the function of the SCON register? Explanation: SCON register is mainly used for programming the start bits, stop bits and data bits of framing. As it consists of bits like RB8, TB8, SM0, SM1, SM2 etc.

Which IC can be used to interface relay with 89c51?

Interfacing Relay with 8051 using Keil C – AT89C51.