What is stored by register in microprocessor?

A processor register (CPU register) is one of a small set of data holding places that are part of the computer processor. A register may hold an instruction, a storage address, or any kind of data (such as a bit sequence or individual characters). Some instructions specify registers as part of the instruction.

What happens when 8085 is reset?

RESET IN − This signal is used to reset the microprocessor by setting the program counter to zero. RESET OUT − This signal is used to reset all the connected devices when the microprocessor is reset. READY − This signal indicates that the device is ready to send or receive data.

What is used for storing results temporarily in 8085 microprocessor?

Temporary register is also an 8-bit register which the programmer can’t access at all. It is temporarily stored inside 8085 microprocessor which is 8 bit operand to the instruction set. The result is stored in the accumulator, and the flags (flip-flops) are set or reset according to the result of the operation.

How are registers used in fetch execute cycle?

The way registers are used to run programs is often known as the FETCH – DECODE – EXECUTE cycle. This is because that is all the CPU actually does. It fetches instructions, decodes them and then executes them. It does this very quickly indeed, but that is all it does.

What is fetching in microprocessor?

The processor operates by processing instructions in what is called the “fetch/execute cycle.” The processor fetches (reads from memory) an instruction and then, depending on the instruction, executes it (takes some further action with it, such as shifting bits to the right or left).

Why registers are used inside of microprocessors explain?

Registers receive binary data as input, checks the data available with them and process the input and deliver the output to the system as binary output. Now, a copy of the output is stored in the register. This helps the system to fetch the data for faster processing.

What are the various registers in 8085?

The 8085 has six general – purpose registers to store 8-bit data; these are identified as B, C, D, E, H and L as shown in the figure. They can be combined as register pairs – BC, DE, and HL – to perform some 16-bit operations.

What are different interrupts of 8085 microprocessor?

There are 5 Hardware Interrupts in 8085 microprocessor. They are – INTR, RST 7.5, RST 6.5, RST 5.5, TRAP. Software Interrupts are those which are inserted in between the program which means these are mnemonics of microprocessor.

What are the temporary registers of 8085 microprocessor and why they are used?

W and Z are two 8-bit temporary registers of 8085 microprocessor, which is not accessible to the user. They are exclusively used for the internal operation by the microprocessor.

Which register hold last fetch instruction?

Instruction Register(IR) : Holds the last instruction fetched.

How many types of registers are there in 8085 microprocessor?

Registers in 8085: (a) General Purpose Registers – The 8085 has six general-purpose registers to store 8-bit data; these are identified as- B, C, D, E, H, and L. These can be combined as register pairs – BC, DE, and HL, to perform some 16-bit operation.

What is the capacity of 8085 microprocessor?

8 bit microprocessor (8085 microprocessor can read or write or perform arithmetic and logical operations on 8-bit data at time) It has 8 data lines and 16 address lines hence capacity is 216 = 64 kB of memory Cock frequency is 3 MHz It requires +5V power supply.

What is the use of accumulator in 8085 microcontroller?

(a) Register A (Accumulator) – Register A is an 8-bit register used in 8085 to perform arithmetic, logical, I/O & LOAD/STORE operations. Register A is quite often called as an Accumulator.

What is address bus and data bus in 8085 microprocessor?

1) Address Bus (A15-A8 and AD7-AD0): The microprocessor 8085 has 16 bit address lines from A15-A8 and AD7-AD0. These lines are used to transfer 16 bit address of memory as well as 8-bit address of I/O ports. 2) Data Bus: The lower 8 lines (AD7-AD0) are often called as multiplexed data lines.