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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The CPU is held in reset condition until this pin is high.

This is a non-maskable interrupt mciroprocessor has highest priority. This pin is used for hold acknowledgement. These pins are multiplexed to be used as address bus as well as data bus.

8085 Microprocessor Pin Diagram Explained

That is, they can be enabled or disabled using programs. Power supply and Frequency signals: In the previous article we saw how ALE helps in demultiplexing the lower order address and data bus. A clock cycle is nothing but the time taken between two adjacent pulses of the oscillator.

It cannot be enabled or disabled using a program. A crystal or RC, LC network is connected to these two pins. They are time multiplexed.

Whenever the microprocessor receives interrupt signal. It has to be acknowledged. This is a Read control signal active low.

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Suppose if analog to digital converter is using the address and data bus and if LCD requests the use of address and data bus by giving HOLD signal, then the microprocessor transfers the control to the LCD as soon as the current cycle is over. They are used for the most significant bit of memory address. S0 and S1 are status signals which provides different status and functions depending on their status.

This signal is primarily used to synchronize slower peripherals with the microprocessor. It is ground reference. INTR is an interrupt request signal. The pins A8-A15 denote the address bus. In simple words clock cycle refers to the transition between o volts to 5 volts and back to 0 volts. Control and Status Signals: Consider two peripheral devices. This indicates if any other device is requesting the use of address and data bus.

INTR can be enabled or disabled by using software. After the LCD process is over, the control is transferred back to analog and digital converter. This signal is used to control READ operation of the microprocessor.

Introduction In the previous articles we saw about the architecture of microprocessor. 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.


Pin Diagram and Pin description of 8085 Microprocessor

This pin resets the program counter to 0 and resets interrupt enable and HLDA flip-flops. This is a Write control signal active low. Consider we have an address to be processed. Pin Diagram of Microprocessor and its description is as follows: These are nothing but the restart interrupts. When it is high. This is used to acknowledge interrupt. The 80085 is internally divided by two; therefore to operate a system at 3 Pjn, the crystal should have frequency of 6 Mhz.

This is provided by CLK pin.

Pin diagram of – Microprocessor Course

They are used as lower order address bus as well as data bus. That is, an operation is performed when the signal goes low. These pins are used for least significant bits of address 80085 in the first machine clock cycle and used as data bus for second and third clock cycle.

It indicates whether the HOLD signal is received or not. Pin-wise description of is as follows.

These signals are used for giving serial input and output data.