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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They are used as lower order address bus as well as data bus. This signal is primarily used to synchronize slower peripherals with the microprocessor. The CPU is held in reset condition until this pin is high. This pin resets diagarm program counter to 0 and resets interrupt enable and HLDA flip-flops. Such signals come under this category.

This is a non-maskable interrupt and has highest priority. Control and Status Signals: Signals associated with data bus comes under this type. This is a Write control signal active low.

Pin Diagram and Pin description of

A crystal or RC, LC network is connected to these two pins. Its frequency is always same as the frequency at which the microprocessor operates.


When HOLD pin is activated by an external signal the microprocessor relinquishes control of buses and allows the external pheripheral to use them. After the LCD process explajation over, the control is transferred back to analog and digital converter.

It cannot be enabled or disabled using a program. This pin provides serial input data. The lower order address bus is added to memory or any external latch. Introduction In the previous articles we saw about the architecture of microprocessor. While the pin goes low, the address is assigned for the memory. AD 0 -AD 7.

8085 Microprocessor Pin Diagram Explained

This distinguishes whether the address is for memory or IO. This is an active high, serial output port pin, used to transfer serial 1 bit data under software control.

Signals which aids in supplying power and generating frequency are associated with this type.

Classification of Signals The various signals in a microprocessor can be classified as Power supply and Frequency signals: So the first clock cycle means the first transition of pulse from 0volts to 5 volts and then back to 0 volts. Whenever INTR goes high the microprocessor completes the current instruction which is being executed and then acknowledges the INTR signal and processes it.


That is, they can be enabled or disabled using programs. Diaggam is an active high output signal used to indicate that the microprocessor is reset. They are time multiplexed. These pins are multiplexed to be used as address bus as well as data bus.

Pin Diagram and Pin description of Microprocessor

A clock cycle is nothing but the time taken between two adjacent pulses of the oscillator. These are nothing but the restart interrupts.

Consider two peripheral devices. The pins A8-A15 denote the address bus.

Whenever the microprocessor receives interrupt signal. This is provided by CLK pin. These are the terminals which are connected to external oscillator to produce the necessary and suitable clock operation. Pin-wise description of is as follows. Among the interrupts of microprocessor, TRAP is the only non-maskable interrupt. These 8 signal lines are unidirectional and used for most significant bits called higher order address bus of a bit address.

This signal can be used as the system clock for other devices.