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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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It indicates whether the HOLD signal is received or not. This is a Read control signal active low. This indicates if any other device is requesting the use of address and data bus. Pins like Vcc and 80855 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.

It has the lowest priority among the interrupts. Power supply and Frequency signals: Signals associated with data bus comes under this type. INTR can be enabled or disabled by using software. Whenever the microprocessor receives interrupt signal.


Pin Diagram of Microprocessor and its description is as follows: These are the terminals which are connected to external oscillator to produce the necessary and suitable clock operation.

Its frequency is always same as the frequency at which the microprocessor operates. It has the highest priority pinn the interrupts.

That is, they can be enabled or disabled using programs. This is an active high output signal used to indicate that the microprocessor is reset. A crystal or RC, LC network is connected to these two pins.

8085 Microprocessor Pin Diagram Explained

READY is used by the microprocessor to check whether a peripheral is ready to accept or transfer data. This is an active high, serial input port pin, used to accept serial 1 bit data under software control.

This is an active low signal. The serial data on this pin is loaded into the seventh bit of the accumulator when RIM instruction is executed. In the previous articles we saw about the architecture of microprocessor. Consider we have an address to be processed. This signal is used to reset other devices in system.


Microprocessor Pin Configuration

These are nothing but the restart interrupts. The pins A8-A15 denote the address bus. They insert an internal restart function automatically. These signals are used for giving serial input microprocessog output data. In this article let us discuss in detail about the various signals involved in transferring data and executing instructions in microprocessor. 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 is provided by CLK pin.

The serial data on this pin delivers its output to the seventh bit of the accumulator when SIM instruction is executed. Such signals come under this category. This pin provides serial input data. The CPU is held in reset condition until this pin is high.

This pin provides the serial output data.