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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More complex operations and other arithmetic operations must be implemented in software. Data is provided through the registers.

Microprocessor Study notes for Electronics and Communication

Copy H and L registers to the stack pointer. MVI A,00 ; Load immediate mocroprocessor into accumulator. It has the lowest priority mucroprocessor the interrupts. Load the register pair immediate. There are also eight one-byte call instructions RST for subroutines located at the fixed addresses 00h, 08h, 10h, Whenever INTR goes high the microprocessor completes the current instruction which is being executed and then acknowledges the INTR signal and processes it.

The Instruction Format: Load H and L registers direct.

The system can now continue by selecting another process for execution, thereby utilizing the CPU cycles typically lost when using PIO. Pins like Microprocesor and ground are classified under this type.


The serial data on this pin is loaded into the seventh bit of the accumulator when RIM instruction is executed.

Since microprocesso of these instructions usually relates to specific hardware features, the necessary program modification would typically be nontrivial. However, it requires less support circuitry, allowing simpler and less expensive microcomputer systems to be built.

The contents of the accumulator are copied into the memory location specified by the operand. This is an active high output signal indicating that the MPU is relinquishing the control of the buses.

When an instruction is fetched micrroprocessor memory then it is stored in the Instruction register.

The ALU performs the actual numerical and logical operations. An Intel AH processor. In a three byte instruction, microproceesor first byte specifies the opcode and the following two bytes specify the bit address.

8085 Microprocessor Pin Diagram Explained

These are the terminals which are connected to external oscillator to produce the necessary and suitable clock operation. Note that, the second byte is the low-order address and the third byte is the high-order address. Some instructions use HL as a limited bit accumulator.

The original development mjcroprocessor had an processor. Rd, data M, data.

8085 Microprocessor Study notes for Electronics and Communication

These are intended to be microprocesssor by external hardware in order to invoke a corresponding interrupt-service routine, but are also often employed as fast system calls. A surprising number of spare card cages and processors were being sold, leading to the development of the Multibus as a separate product. The microprocessor uses these flags to test data conditions.


It controls the serial data communication by using these two instructions: An immediate value can also be moved into any of the foregoing destinations, using the MVI instruction. The can also be clocked by an external oscillator making it feasible to use the in synchronous multi-processor systems using a system-wide common clock for all CPUs, or to synchronize the CPU to an external time reference such as that from a video source or a high-precision time reference.

The same is not true of the Z The stack pointer is incremented by 1 and the contents of that memory location are copied to the high-order register B, D, H, A of the operand.

The processor completes the execution of the current machine cycle; floats high impedance state the address, the data, and the control lines; and sends the Hold Acknowledge HLDA signal. Store H and L registers direct.