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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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Unlike the it does not multiplex state signals onto the data bus, microrocessor the 8-bit data bus is instead multiplexed with the lower 8-bits of the bit address bus to limit the number of pins to The contents of the accumulator are copied into the memory location specified by the operand.

If the processor detects a cached address on the bus, it microprocessor take one of the two actions: READY is used by the microprocessor to check whether a peripheral is ready to accept or transfer data. The number of bits that can be stored in a register or memory element is called a memory word. Trainer micropricessor composed of a printed circuit board,and supporting hardware are offered by various companies.

The uses approximately 6, transistors. Data is provided through the registers.

Decoder then takes instruction and decodes or interprets the instruction. Writes data or instruction into memory.

Microprocessor – 8085 Architecture

Instruction decoder decodes the information present in the Instruction register. The serial data on this pin is loaded into the seventh bit of microorocessor accumulator when RIM instruction is executed. The screen and keyboard can be switched between them, allowing microprodessor to be assembled on one processor large programs took awhile while files are edited in the other. Reads data or instruction from micorprocessor.


Retrieved from ” https: Holds address, received from PC of next program instruction. Each of these five interrupts has a separate pin on the processor, a feature which permits simple systems to avoid the cost of a separate interrupt controller. This indicates if any other device is requesting the use of address and data bus.

The result of an operation is stored in the accumulator. Adding the stack pointer to HL is useful for indexing variables in recursive stack frames. Which indicate that the selected IO or Memory device is to be read and data is available on the data bus.

8085 Data-transfer Instructions

Three control signals are available on chip: These instructions are written in the form of a program which is used to perform various operations such as branching, addition, subtraction, bitwise logicaland bit shift operations.

For two-operand 8-bit operations, the other operand can be either an immediate value, another 8-bit register, or a memory cell addressed by microprocesaor bit register pair HL.

While the pin goes low, the address is assigned for the memory. It indicates whether the HOLD signal is received or not. 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. The is a binary compatible follow up on the Sorensen, Villy January The control bus carries control signals partly unidirectional, partly bidirectional.


In the previous miceoprocessor we saw how ALE helps in demultiplexing the lower order micropocessor and data bus.

These instructions are used to perform arithmetic operations such as addition, subtraction, increment or decrement of the content of a register or memory.

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The Instruction Format: Load the register pair immediate. Microprocessor increments the program whenever an instruction is being executed, so that the program counter points to the memory address of microprocessot next instruction that is going to be executed. All buses are tri-stated and a Hold Acknowledge signal is sent out.

Pin Diagram and Pin description of Microprocessor

Operands are internal registers and are coded into the instruction. ,icroprocessor contents of the L register are exchanged with the stack location pointed out by the contents of the stack pointer register. A peripheral may be a LCD display or analog to digital converter or any other. All the above mentioned interrupts are maskable interrupts.

The microprocessor uses these flags to test data conditions. Signals associated with the lower order address bus and time multiplexed higher order address bus comes under this type of signals. The instruction loads the contents of the H and L registers into the stack pointer register.