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 pin resets the program counter to 0 and resets interrupt enable and HLDA flip-flops. These pins are multiplexed to be used as address bus as well as data bus.

Consider two peripheral devices. While the pin goes low, the address is assigned for the memory. Pins like Vcc and ground are classified under this type.

Signals associated with the lower order address bus and time multiplexed higher order address bus comes under this type of signals. READY is used by the microprocessor to check whether a peripheral is ready to accept or transfer data. It has to be acknowledged. This signal is used to reset other devices in system.

This is a non-maskable interrupt and has highest priority. Introduction In the previous articles we saw about the architecture of microprocessor. Signals associated with data bus comes under this type. That is, they can be enabled or disabled using programs.

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They diavram used for the most significant bit of memory address. Such signals come under this category. Whenever INTR goes high the microprocessor completes the current instruction which is being executed and then acknowledges the INTR signal and processes it.

Pin Diagram of Microprocessor and its description is as follows: These are nothing but the restart interrupts. That is, an operation is performed when the signal goes low.

Pin Diagram and Pin description of Microprocessor

It is ground reference. Pin are vectored interrupt that transfer the program control to specific memory location. This is provided by CLK pin. This is an active low signal. These are the terminals which are connected to external oscillator to produce the necessary and suitable clock operation.

Microprocessor Pin Configuration

The frequency is internally divided by two; therefore to operate a system at 3 MHz, the crystal should have frequency of 6 Mhz. They have higher priority than the INTR interrupt. They are time multiplexed. These signals are used for giving serial input and output data. In the previous articles we saw about the architecture of microprocessor.

Pin Diagram and Pin description of 8085 Microprocessor

It cannot be enabled or disabled using a program. Control and Status Signals: Its frequency is always same as the frequency at which the microprocessor operates.

This signal goes high during the first clock cycle and enables the lower order address bits. When it is high. In this article let us discuss in detail about the various signals involved in transferring data and executing instructions in microprocessor. This distinguishes whether the address is for memory or IO. All the above mentioned interrupts are maskable interrupts.


Exppanation which aids in supplying power and generating frequency are associated with this type. This pin provides serial input data. In the previous article we saw how ALE helps in demultiplexing the lower order address 8805 data bus.

INTR is an interrupt request signal.

Microprocessor – 8085 Pin Configuration

Classification of Signals The various signals in a microprocessor can be classified as Power supply and Frequency signals: Suppose if analog to digital converter is using the address and data bus diargam if LCD requests the use of address and data bus by giving HOLD signal, then the microprocessor transfers the control to the LCD as microprcessor as the current cycle is over.

It has the highest priority among the interrupts. This is a Read control signal active low. So the first clock cycle means the first transition of pulse from 0volts to 5 volts and then back to 0 volts.

These pins are used for least significant bits of address bus in the explaation machine clock cycle and used as data bus for second and third clock cycle.