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- Arithmetic and Logic Unit (ALU) : It is used to perform mathematical operations like: addition, multiplication, subtraction, division, decrement, increment, etc.
- Flag Register : It is an 8-bit register that stores either 0 or 1 depending upon which value is stored in the accumulator.
- Accumulator : Accumulator is used to perform I/O, arithmetic and logical operations. It is connected to ALU and internal data bus.
- General Purpose Registers : There are 6 general purpose registers. These registers can hold 8 bit values. These 8-bit registers are B,C,D,E,H,L. These registers work as 16-bit registers when they work in pair like: B-C, D-E, H-L.
- Accumulator
- Arithmetic and Logic Unit
- General Purpose Register
- Program Counter
- Stack Pointer
- Flag Register
- Instruction Register and Decoder
- Timing and Control Unit
- Interrupt Control
- Serial Input/Output Control
It is an 8-bit register used to perform arithmetic, logical, I/O & LOAD/STORE operations. It is connected to internal data bus & ALU.
As the name suggests, it performs arithmetic and logical operations like Addition, Subtraction, AND, OR, etc. on 8-bit data.
There are 6 general purpose registers in 8085 processor, i.e. B, C, D, E, H & L. Each register can hold 8-bit data. These registers can work in pair to hold 16-bit data and their pairing combination is like B-C, D-E & H-L.
It is a 16-bit register used to store the memory address location of the next instruction to be executed. Microprocessor increments the program whenever an instruction is being executed, so that the program counter points to the memory address of the next instruction that is going to be executed.
It is also a 16-bit register works like stack, which is always incremented/decremented by 2 during push & pop operations.
It is an 8-bit register having five 1-bit flip-flops, which holds either 0 or 1 depending upon the result stored in the accumulator. These are the set of 5 flip-flops − 1. Sign (S) 2. Zero (Z) 3. Auxiliary Carry (AC) 4. Parity (P) 5. Carry (C) Its bit position is shown in the following table −
It is an 8-bit register. When an instruction is fetched from memory then it is stored in the Instruction register. Instruction decoder decodes the information present in the Instruction register.
It provides timing and control signal to the microprocessor to perform operations. Following are the timing and control signals, which control external and internal circuits − 1. Control Signals: READY, RD’, WR’, ALE 2. Status Signals: S0, S1, IO/M’ 3. DMA Signals: HOLD, HLDA 4. RESET Signals: RESET IN, RESET OUT
As the name suggests it controls the interrupts during a process. When a microprocessor is executing a main program and whenever an interrupt occurs, the microprocessor shifts the control from the main program to process the incoming request. After the request is completed, the control goes back to the main program. There are 5 interrupt signals in...
It controls the serial data communication by using these two instructions: SID (Serial input data) and SOD (Serial output data).
Learn about the 8085 microprocessor, the first commercially successful microprocessor by Intel. It operates on 8-bit data and has 16-bit address bus, control unit, arithmetic logic unit, registers, buses and flags.
Learn about the 8085 microprocessor, an 8-bit Intel chip introduced in 1976. It has functional units, registers, buses, interrupts, and a pin diagram. See its instruction set and examples.
- The 8085 microprocessor is an 8-bit microprocessor developed by Intel in the 1970s. It was widely used in early personal computers and embedded sys...
- The main difference between the 8085 and 8086 microprocessors is their architecture and data bus width. The 8085 is an 8-bit microprocessor, while...
- The 8085 microprocessor is considered a CISC (Complex Instruction Set Computer) architecture, as it supports a large number of complex instructions...
- Although microprocessor 8085 is a 8-bit processor. But it has a few operations of 16-bit processor.
Learn the basics of 8085 microprocessor architecture, its technical features, functional units, registers, interrupts and block diagram. The 8085 is a 40 pin, 8 bit processor launched by Intel in 1976 that influenced early computing systems.
Feb 12, 2020 · Learn the basics of the Intel 8085 microprocessor, an 8-bit general-purpose CPU based on Von-Neumann architecture. See the components, functions and features of the 8085 and compare it with the ARM 7 architecture.
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The architecture of the 8085 microprocessor mainly includes the timing & control unit, Arithmetic and logic unit, decoder, instruction register, interrupt control, a register array, serial input/output control. The most important part of the microprocessor is the central processing unit.
