The Intel (“eighty-eighty-five”) is an 8-bit microprocessor produced by Intel and introduced in It is a software-binary compatible with the more-famous. Microprocessor: It is a programmable electronics chip (Integrated Circuit ( IC)). A single IC has computing and decision making capabilities similar to. In addition to the microprocessor, a personal computer has a keyboard for The AS/ uses the PowerPC microprocessor with its reduced instruction set.

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Push the register pair onto the stack. It is bidirectional, whereas address bus carries the location to where it should be stored microporcessor it is unidirectional.

Whenever the microprocessor receives interrupt signal. The contents of register L are stored in the memory location specified by the bit address in the operand and the contents of H register are stored into the microlrocessor memory location by incrementing the operand. In the previous articles we saw about the architecture of microprocessor.

The accumulator stores the results of arithmetic and logical operations, and the flags register bits sign, zero, auxiliary carry, parity, and carry flags are set or cleared according to the results of these operations. Among the interrupts of microprocessor, TRAP is the only non-maskable interrupt.

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Microprocessor Study notes for Electronics and Communication

The CPU is one part of a family of chips developed by Intel, for building a complete system. This is an active low signal. Also, the architecture and instruction set of the are easy for a student to understand. The contents of a memory location, specified by kicroprocessor bit address in the operand, are copied to the accumulator. In the previous article we saw how ALE helps in demultiplexing the lower order address and data bus.


A single IC has computing and decision making capabilities similar to central processing unit of a computer. They insert an internal restart function automatically. The has extensions to support new interrupts, with three maskable interrupts RST 7.

In a three byte instruction, the first byte specifies the opcode micrporocessor the following two bytes specify the bit address. Temporary store for the current instructions of a program. The result of an operation is stored in microprocessorr accumulator. The microprocessor uses this register to sequence the execution of the instructions.

Sorensen in the process of developing an assembler. Pin 39 is used as the Hold pin. Each instruction has two parts, one is task to be performed, called the operation code opcodeand the second is the data to be operated on called the operand.

These are nothing but the restart interrupts. The ALU includes five flip-flops. Adding the 0855 pointer to HL is useful for indexing variables in recursive stack frames.

8085 Microprocessor Pin Diagram Explained

Whenever INTR goes high the microprocessor completes the current instruction which is being executed and then acknowledges the INTR signal and processes it.

Comments Write a comment. MVI A,00 ; Load immediate data into accumulator. It indicates whether the HOLD signal is received or not. The uses approximately 6, microprocessir. The other six registers can be used as independent byte-registers or as three bit register pairs, BC, DE, and HL or B, D, H, as referred to in Intel documentsdepending on the particular instruction.

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MOV A, [[]] Implicit addressing: In this article let us discuss in detail about the various signals involved in transferring data and executing instructions in microprocessor. It generates timing and control signals, which are necessary for the execution of instructions. The control bus carries control signals partly unidirectional, partly bidirectional.

The ALU performs the following arithmetic and logical operations. Lastly, the carry flag is set if a carry-over from bit 7 of the accumulator the MSB occurred. Pop off stack to the register pair. Week 8 Aug 27 30 upvotes. Accepts data from input device. Operations that have to be implemented by program code subroutine libraries include comparisons of signed integers as well as multiplication and division. It provides timing and control signal to the microprocessor to perform operations.

The 8-bit mmicroprocessor is stored in the destination register or memory. Data bus carries the data to be stored.

Pin Diagram and Pin description of 8085 Microprocessor

The Address bus consists of 16 wires. Software simulators are available for the microprocessor, which allow simulated execution of opcodes in a graphical environment.

Later and support was added including ICE in-circuit emulators. Trainer kits composed of a printed circuit board,and supporting hardware are offered by various companies. The number of bits that can be stored in a register or memory element is called a memory word.