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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Power supply and Frequency signals: This signal is used to control READ operation of the microprocessor. This indicates if any other device is requesting the use of address and data bus. This is an active high, mircoprocessor input port pin, used to accept serial 1 bit data under software control.

Microprocessor – 8085 Pin Configuration

Pin microprocexsor vectored interrupt that transfer the program control to specific memory location. Control and Status Signals: Introduction In the previous articles we saw about the explannation of microprocessor. The pins A8-A15 denote the address bus. Such signals come under this category. In simple words clock cycle refers to the transition between o volts to 5 volts and back to 0 volts.

This signal is used to reset other devices in system. The serial data on this pin is loaded into the seventh bit of the accumulator when RIM instruction is executed. Its frequency is always same as the frequency at which the microprocessor operates.


The lower order address bus is added to memory or any external latch.

Among the interrupts of microprocessor, TRAP is the only non-maskable interrupt. This pin provides serial input data. This pin provides the serial output data.

A clock cycle is nothing but the time taken between two adjacent pulses of the oscillator. They are time multiplexed. This is an active low signal. These signals are used for giving serial input and output data.

It indicates whether the HOLD signal is received or not. These 8 signal lines are unidirectional and used for most significant bits called higher order address bus of a bit address. The serial data on this pin delivers its output to the seventh bit of the accumulator when SIM instruction microprocesssor executed.

Wxplanation is ground reference. In this article let us discuss in detail about the various signals involved in transferring eplanation and executing instructions in microprocessor. Signals associated with the lower order address bus and time multiplexed higher order address bus comes under this type of signals.

These are nothing but the restart interrupts. This is a Write control signal active low. This is a Read control signal active low.

This oin is used for hold acknowledgement. The CPU is held in reset condition until this pin is high. When it is high. The frequency is internally divided by two; therefore to operate a system at 3 MHz, the crystal should have frequency of 6 Mhz.


Learn Pin Description

After the LCD process is over, the control is transferred back to analog and digital converter. READY is used by the microprocessor to check whether a peripheral is ready to accept or transfer data. This signal goes high during the first clock cycle and enables the lower order address bits. Pins like Vcc and ground are classified under this type.

These pins are multiplexed to be used as address bus as well as data bus. A peripheral may be a LCD display or analog to digital converter or any other. This signal is primarily used to synchronize slower peripherals with the microprocessor. That is, they can be enabled or disabled using programs. INTR is an interrupt request signal. Pin-wise description of is as follows. S0 and S1 are status signals which provides different status and functions depending on their status.

This is used to acknowledge interrupt. 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.