The 8085 is an 8-bit microprocessor. It was produced by Intel and first introduced in 1976. The 8086 is enhanced version of 8085 microprocessor. It is 16-bit processor….Differences between 8085 and 8086 microprocessor.

40

mukund kumar :(May 01, 2018) 8085 has 27 output pin and 13 input pin….Discussion Forum.

The 8085 is one of Intel’s earliest microprocessors. It has a 40 pin IC and is an 8-bit microprocessor. This means that the microprocessor has an 8-bit data bus, which indicates that the microprocessor is capable of handling 8 bits of data….Status Signals (Pins ALE, S1, and S0)

SOD (Serial output data line) − The output SOD is set/reset as specified by the SIM instruction. SID (Serial input data line) − The data on this line is loaded into accumulator whenever a RIM instruction is executed.

The 40 pins of the microprocessor can be divided into six groups such as address bus, data bus, control signals & status signals; power supply & frequency, externally started signals and serial input/output ports.

To indicate to user that the microprocessor is working and is ready for use. To provide proper WAIT states when the microprocessor is communicating with a slow peripheral device. To slow down a fast peripheral device so as to communicate at the microprocessor’s device.

The process of fetching the next instruction when the present instruction is being executed is called as pipelining. Pipelining has become possible due to the use of queue. BIU (Bus Interfacing Unit) fills in the queue until the entire queue is full. 8086 BIU normally obtains two instruction bytes per fetch.

Pipelining is a technique where multiple instructions are overlapped during execution. Pipeline is divided into stages and these stages are connected with one another to form a pipe like structure. Instructions enter from one end and exit from another end. Pipelining increases the overall instruction throughput.

Advantages of Pipelining Increase in the number of pipeline stages increases the number of instructions executed simultaneously. Faster ALU can be designed when pipelining is used. Pipelined CPU’s works at higher clock frequencies than the RAM. Pipelining increases the overall performance of the CPU.

A pipeline diagram shows the execution of a series of instructions. — The instruction sequence is shown vertically, from top to bottom. — Clock cycles are shown horizontally, from left to right. — Each instruction is divided into its component stages. — Simultaneously, the “sub” is in its Instruction Decode stage.