Table of Contents
- 1 What is the purpose of special function register?
- 2 How many SFR are there in 8051?
- 3 What is the difference between general purpose registers and special function registers?
- 4 Why registers are used in microprocessors?
- 5 What is special purpose register and its types?
- 6 Which of the following register is a special purpose register?
What is the purpose of special function register?
A Special Function Register (or Special Purpose Register, or simply Special Register) is a register within a microprocessor, which controls or monitors various aspects of the microprocessor’s function.
How many SFR are there in 8051?
21 SFR’s
There are 21 SFR’s (special function registers) in microcontroller 8051. The SFR is the upper area of addressable memory, from address OX80 to OXff. These SFR’s contain all peripherally related register like P0, P1, P2, P3, timers or counters, serial part and interrupt related registers.
Where are SFR stored in 8051?
The 8051 family of microcontrollers provides a distinct memory area for accessing Special Function Registers (SFRs). SFRs are used in your program to control timers, counters, serial I/Os, port I/Os, and peripherals. SFRs reside from address 0x80 to 0xFF and can be accessed as bits, bytes, and words.
What are special purpose registers give three examples?
3 Answers. Special purposes register are, as the name implies, registers which are designed for just a task. For example, cs , ds , gs and the other segment registers fall into the special purpose registers, because they exist to hold segments’ number.
What is the difference between general purpose registers and special function registers?
General purpose – These do not have side effects, can be used by most instructions. One can do arithmetic with them, use them for memory addresses, and so on. Special purpose – Registers which do not have side effects, but can only be used for certain purposes and only by certain instructions.
Why registers are used in microprocessors?
Registers are temporary storage locations inside the CPU that hold data and addresses. The register file is the component that contains all the general purpose registers of the microprocessor. A few CPUs also place special registers such as the PC and the status register in the register file.
Which is not a special function register?
Which of the following is not a special function register? Explanation: Accumulator is a general function register, which can be used for multiple functions. Explanation: SP is the short form of stack pointer which store address of stack top. 7.
Which of the following is not a special function register?
What is special purpose register and its types?
Special purpose registers ( SPR ) hold program state; they usually include the program counter (aka instruction pointer), stack pointer, and status register (aka processor status word).
Which of the following register is a special purpose register?
Flag registers: The flag register is a special purpose register and it is completely different from other registers in microprocessor. It consists of 8 bits and only 5 of them are useful.