1. 1 Q.1) Draw & Explain the Pin-Diagram of Microprocessor in Detail? Ans: The Microprocessor is an 8-Bit general-purpose. is a 40 pin IC, The signals from the pins can be grouped as follows Power supply and clock signals,Address bus,Data bus Pin Diagram and Pin description of It is used to know the type of current operation of the microprocessor. Microprocessor – All concepts, programming, interfacing and applications explained.

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This signal goes high during the first clock cycle and enables the lower order address bits.

It is ground reference. Pin Diagram of Microprocessor and its description is as follows: These pins are used for least significant bits of address bus in the first machine clock cycle and used as data bus for second and third clock cycle.

Pin Diagram and Pin description of

These 8 signal lines mmicroprocessor unidirectional and used for most significant bits called higher order address bus of a bit address. Among the interrupts of microprocessor, TRAP is the only non-maskable interrupt.


This is an active low signal. This signal is used to control READ operation of the microprocessor. This pin provides serial input data.

The CPU is held in reset condition until this pin 8805 high. This pin resets the program counter to 0 and resets interrupt enable and HLDA flip-flops.

This is an active high output signal used to indicate that the microprocessor is reset.

Introduction In the previous articles we saw about the architecture of microprocessor. They have higher priority than the INTR interrupt.

8085 Microprocessor Pin Diagram Explained

In the previous article we saw how ALE helps in demultiplexing the lower order address and data bus. Such signals come under this category. This distinguishes whether the address is for memory or IO. AD 0 -AD 7. This is an active high, serial input port pin, used to accept serial 1 bit data 88085 software control.

This is a Read control signal active low. In simple words clock cycle refers to the transition between o volts to 5 volts and back to 0 volts. These pins are multiplexed to be used as address bus microproxessor well as data bus.

Whenever the microprocessor receives interrupt signal. This is provided by CLK pin. It cannot be enabled or disabled using a program.


That is, they can be enabled or disabled using programs. Pins like Vcc and ground are classified under this type. It indicates whether the HOLD signal is received or not.

So the first clock cycle means the first transition of pulse from 0volts to 5 volts and then back to 0 volts. Explanaiton are time multiplexed.

It has the lowest priority among the interrupts. Pin-wise description of is as follows. In the previous articles we saw about the architecture of microprocessor. When it is high.

INTR is an interrupt request signal. All the above mentioned interrupts are maskable interrupts. It has the highest priority among the interrupts. The serial data on this pin delivers its output to the seventh bit of the accumulator when SIM instruction is executed.

They are used for the most significant bit of memory address. This indicates if any other device is requesting the use of address and data bus.

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