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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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Whenever the microprocessor receives interrupt signal. This signal can be used as the system clock for other devices.

That is, they can be enabled or disabled using programs. 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. The serial data on this pin delivers its output to the seventh bit of the accumulator when SIM instruction is executed.

These are nothing but the restart interrupts. S0 and S1 are status signals which provides different status and functions depending on their status. This is a Read control signal explanafion low. This is used to acknowledge interrupt.

Pin Diagram and Pin description of Microprocessor

In the previous articles we saw about the architecture of microprocessor. Signals associated with data bus comes microprocessro this type. This pin provides the serial output data.

When the reset pin is activated by an external key all the internal operations are suspended and the program counter is cleared and the program execution begins at zero memory address.


Among the interrupts of microprocessor, TRAP is jicroprocessor only non-maskable interrupt. That is, an operation is performed when the signal goes low.

Microprocessor Pin Diagram Explained

This is an active low signal. Whenever INTR goes high the microprocessor microprocessr the current instruction which is being executed and then acknowledges the INTR signal and processes it. In this article let us discuss in detail about the various signals involved in transferring data and executing instructions in microprocessor.

It has to be acknowledged. AD 0 -AD 7. In the previous article we saw how ALE helps in demultiplexing the lower order address and data bus. When HOLD pin is activated by an external signal the microprocessor relinquishes control of buses and allows the external pheripheral to micrporocessor them. INTR can be enabled or disabled by using software. Such signals come exlpanation this category. The frequency is internally divided by two; therefore to operate a system at 3 MHz, the crystal should have frequency of 6 Mhz.

READY is used by the microprocessor to check whether a peripheral is ready to accept or transfer data.

This signal is primarily used to synchronize slower microprocessof with the microprocessor. These 8 signal lines are unidirectional and used for most significant bits explanatiln higher order address bus of a bit address.

This is a Write control signal active low. They insert an internal restart function automatically. Consider two peripheral devices.

Control and Status Signals: These are the terminals which are connected to external oscillator to produce the necessary and suitable clock operation.

Pin Diagram and Pin description of 8085 Microprocessor

They have higher priority than the INTR interrupt. This is an active high, serial output port pin, used to transfer serial 1 bit microrpocessor under software control. Classification of Signals The various signals in a microprocessor can be classified as Power supply and Frequency signals: They are time multiplexed.

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It cannot be enabled or disabled using a program.

It indicates whether the HOLD signal is received or not. The pins A8-A15 denote the address bus. This signal goes high during the first clock cycle and enables the lower order address bits. This is an active high, serial input port pin, used to accept serial 1 bit data under software control. These signals are used for giving serial input and output data.

This is provided by CLK pin. When it is high.

Signals associated with the lower order address bus and time multiplexed higher order address bus comes under this type of signals. It has the highest priority among the interrupts. This signal is used to reset other devices in system. All the above mentioned interrupts are maskable interrupts. A clock cycle is nothing but the time taken between two adjacent pulses of the oscillator. A crystal or RC, LC network is connected to these two pins.

This is an active high output signal used to indicate that the microprocessor is reset. Consider we have an address to be processed.