basic registers in computer architecture

1. COMPUTER REGISTERS
-Jatin Grover
-BCA 3rd sem
-02021102018

2. REGISTER
A register is a group of flip-flops with each flip-flop
capable of storing one bit of information,
A processor register may hold an instruction, a
storage address, or any data,
The computer needs processor registers for
manipulating data and a register for holding a
memory address,
List of basic registers are as follows-

3. DR
 Full form- Data register
 Number of bits-16
 The Data Register (DR) contains 16 bits which hold
the operand read from the memory location.

4. AR
 Full form- Address register
 Number of bits-12
 The Memory Address Register (MAR) contains 12
bits which hold the address for the memory
location.

5. AC
 Full form- Accumulator
 Number of bits-16
 The Accumulator (AC) register is a general purpose
processing register.

6. IR
 Full form- Instruction register
 Number of bits-16
 The instruction read from memory is placed in the
Instruction register (IR)

7. PC
 Full form- Program counter
 Number of bits-12
 The Program Counter (PC) also contains 12 bits
which hold the address of the next instruction to be
read from memory after the current instruction is
executed.

8. TR
 Full form- Temporary register
 Number of bits-16
 The Temporary Register (TR) is used for holding
the temporary data during the processing

9. INPR
 Full form- Input register
 Number of bits-08
 The Input Registers (IR) holds the input characters
given by the user.

10. OUTR
 Full form- Output register
 Number of bits-08
 The Output Registers (OR) holds the output after
processing the input data.