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 is used to acknowledge interrupt.

Microprocessor – 8085 Pin Configuration

This pin resets the program counter to 0 and resets interrupt enable and HLDA flip-flops. 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.

This is provided by CLK pin. Control and Status Signals: These signals are used for giving serial input and output data. It has to be acknowledged.

Pin Diagram and Pin description of Microprocessor

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 diagrm microprocessor transfers the control to the LCD as soon diagramm the current cycle is over.

The pins A8-A15 denote the address bus. The serial data on this pin is loaded into the seventh bit of the accumulator when RIM instruction is executed.

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


Pin Diagram and Pin description of

This pin provides serial input data. This signal is used to control READ operation of the microprocessor. They pim higher priority than the INTR interrupt. All the above mentioned interrupts are maskable interrupts. This signal goes high during the first clock cycle and enables the lower order address bits.

They insert an internal restart function automatically. This is an active high microprocdssor signal used to indicate that the microprocessor is reset. A peripheral may be a LCD display or analog to digital converter or any other.

They are used as lower order address bus as well as data bus. READY is used by the microprocessor to check whether a peripheral is ready to accept or transfer data. Whenever the microprocessor receives interrupt signal. These pins are used for mkcroprocessor significant bits of address bus in the first machine clock cycle and used as data bus for second and third clock cycle. Consider two peripheral devices.

This is a Read control signal active low. S0 and S1 are status signals which provides different status and diaggram depending on their status. That is, they can be explanatiom or disabled using programs. When HOLD pin is activated by an external signal the microprocessor relinquishes control of buses and allows the external pheripheral to use them. Such signals come under this category. A crystal or RC, LC network is connected to these two pins. Among the interrupts of microprocessor, TRAP is the only non-maskable interrupt.

Introduction In the previous articles we saw about the architecture of microprocessor. So the first clock cycle means the first transition of pulse from 0volts to 5 volts and then back to 0 volts.


Its frequency is always same as the frequency at which the microprocessor operates.

These are nothing but the restart interrupts. Pin are vectored fiagram that transfer the program control to specific memory location. It has the lowest priority among the interrupts.

While the pin goes low, the address is assigned for the memory. These 8 signal lines are unidirectional and used for most significant bits called higher order address bus of a bit address.

This signal is primarily used to synchronize slower peripherals with the microprocessor. That is, an operation is performed when the signal goes low. It has the highest priority among the interrupts. Signals which aids in supplying power and generating frequency are associated with this type. 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. They are used for the most significant bit of memory address.

These pins are explanatlon to be used as address bus as well as data bus. It indicates whether the HOLD signal is received or not. When it is high. Pin Diagram of Microprocessor and its description is as follows: In simple words clock cycle refers to the transition between o volts to 5 volts and back to 0 volts. In the previous article we saw how ALE helps in demultiplexing the lower order address and data bus.