Which are the special purpose registers?
Table of Contents
- 1 Which are the special purpose registers?
- 2 What are special purpose registers in 8086 microprocessor?
- 3 What are special purpose registers in 8085?
- 4 What are special purpose registers in 80386?
- 5 What are the general purpose registers in 8051?
- 6 What are special function registers in PIC microcontroller?
- 7 Which special purpose register determines the current state of the microprocessor?
- 8 How many general purpose registers are in the 80386?
- 9 What is the difference between special purpose registers and general purpose registers?
- 10 What are the different types of registers in CPU?
Which are the special purpose registers?
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).
What are special purpose registers in 8086 microprocessor?
There are two special purpose registers on the 8086, i.e. the instruction pointer (ip) and the flag register. The ip is sometimes referred to as the pc (program counter). These registers cannot be accessed directly, rather, they are modified by the cpu during execution.
What are special purpose registers in 8085?
In addition to the above general-purpose registers, the 8085 microprocessor has special-purpose registers, namely, Program Counter (PC), Stack Pointer (SP), Flags/Status Registers (SR), Instruction Register (IR), Memory Address Register (MAR), Temporary Register (TR), and Memory Buffer Register (MBR).
What are special function registers in 8051?
- Categories of 8051 Microcontroller Special Function Registers.
- A or Accumulator (ACC)
- B (Register B)
- Data Pointer (DPTR – DPL and DPH)
- Stack Pointer (SP)
- PCON (Power Control)
- SCON (Serial Control)
- TCON (Timer Control)
What are the special registers in a typical computer explain their purposes in detail?
Following is the list of some of the most common registers used in a basic computer:
| Register | Symbol | Function |
|---|---|---|
| Accumulator | AC | Processor register |
| Instruction register | IR | Holds instruction code |
| Program counter | PC | Holds address of the instruction |
| Temporary register | TR | Holds temporary data |
What are special purpose registers in 80386?
The six segment registers available in 80386 are CS, SS, DS, ES, FS and GS. The CS and SS are the code and the stack segment registers respectively, while DS, ES, FS, GS are 4 data segment registers. A 16 bit instruction pointer IP is available along with 32 bit counterpart EIP.
What are the general purpose registers in 8051?
The most widely used registers of the 8051 are A (accumulator), B, R0-R7, DPTR (data pointer), and PC (program counter). All these registers are of 8-bits, except DPTR and PC.
What are special function registers in PIC microcontroller?
Special Function Registers (SFR) The special function registers are also memory registers which is used for special dedicated functions. These registers perform various dedicated functions inside the PIC chip. Each special function inside this PIC chip is controlled by using these registers.
What are special purpose registers SFRS related to timer and serial port in 8051 list them with their physical addresses?
8051 Special Function Registers and Ports
| SFR | Address | Function |
|---|---|---|
| TCON | 88 | Timer control. Both bit addressing and byte addressing possible. |
| TH0 | 8C | Timer 0 counter (High). Only byte addressing is possible. |
| TL0 | 8A | Timer 0 counter (Low). Only byte addressing is possible. |
| TH1 | 8D | Timer 1 counter (High). Only byte addressing is possible. |
What are special function registers explain any four special function registers in 8051?
A special function register can have an address between 80H to FFH. These addresses are above 80H, as the addresses from 00 to 7FH are the addresses of RAM memory inside the 8051….Embedded Systems – SFR Registers.
| CY | PSW.7 | Carry Flag |
|---|---|---|
| RS0 | PSW.3 | Register Bank selector bit 0 |
| OV | PSW.2 | Overflow Flag |
| – | PSW.1 | User definable FLAG |
Which special purpose register determines the current state of the microprocessor?
As mentioned earlier, microprocessor fetches these instructions from the memory and executes them The program counter is a special purpose register which, at a given time,stores the address of the next instruction to be fetched. Program Counter acts as a pointer to the next instruction.
How many general purpose registers are in the 80386?
eight
The 80386 has eight 32 – bit general purpose registers which may be used as either 8 bit or 16 bit registers.
What is the difference between special purpose registers and general purpose registers?
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). General purpose registers (GPRs) can store both data and addresses, i.e., they are combined Data/Address registers.
What is the purpose of a register in a processor?
Data is stored in the register for a specific time and delivered to the main memory when asked for. This helps to create temporary storage and permanent storage in the system and thus proper working of the system is maintained in the processor.
What are the different types of registers in 8085 microprocessor?
Registers of 8085 Microprocessor 1 General Purpose Registers. Registers B, C, D, E, H, and L are general purpose registers in 8085 Microprocessor. 2 Temporary Registers. (a)Temporary Data Register – The ALU has two inputs. 3 Special Purpose Registers. 4 4.SixteenBit Registers.
What are the different types of registers in CPU?
Each register is wired within the CPU to perform its specific role. Registers can be divided into two categories according to their particular use: general purpose and special purpose. General purpose registers deal with a wide variety of performance. They are used to hold data values or intermediate results that will be used frequently.