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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These 8 signal lines are unidirectional and used for most significant bits called higher order address bus of a bit address.

8085 Microprocessor Pin Diagram Explained

The pins A8-A15 denote the address bus. These are nothing but the restart interrupts. These are the terminals which are connected to external oscillator to produce the microprocesso and suitable clock operation.

This pin is used for hold acknowledgement. They insert an internal restart function automatically. While the pin goes low, the address is assigned for the memory. Signals which aids in supplying power and generating frequency are associated with this type. Classification of Signals The various signals in a microprocessor can be classified as Power supply and Frequency signals: 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.


These pins are used for least significant bits of address bus in the first machine clock cycle and used as data bus for second and third clock cycle. This is an active high, serial input port pin, used to accept serial 1 bit data under software control. INTR is an interrupt request signal. This pin provides serial input data.

Consider two peripheral devices. In simple words clock cycle refers to the transition between o volts to 5 volts and back to 0 volts.

This distinguishes whether the address is for memory or IO. This is an active high output signal used to indicate that the microprocessor is reset. This signal is used to control READ operation of the microprocessor. After the LCD process is over, the control is transferred back to analog and micropgocessor converter.

Pin Diagram and Pin description of Microprocessor

The serial data on this pin delivers its output to the seventh bit of the accumulator when SIM instruction is executed. Signals associated with the lower order address bus and time multiplexed higher order address bus comes under this type of signals. Pin-wise description of is as follows. This is an active low signal. It indicates whether the HOLD signal is received or not. Control and Status Signals: All the above mentioned interrupts are maskable interrupts. Pin are vectored interrupt that transfer the program control to specific memory location.


When HOLD pin is activated by an external signal the microprocessor relinquishes control of buses and allows the external pheripheral to use them.

This is an active high, serial output port pin, mlcroprocessor to transfer serial 1 bit data under software control. They are time multiplexed. Whenever the microprocessor receives interrupt signal.

It has to be acknowledged. In this article let us discuss in detail about the various signals involved in transferring data and executing instructions in microprocessor. This is a non-maskable interrupt and has highest priority.

It has the lowest priority among the interrupts. Pins like Vcc and ground are classified under this type. This pin provides the serial output data. INTR can be enabled or disabled by using software. This signal can be used as the system clock for other devices. AD 0 -AD 7. When it is high.

Pin Diagram and Pin description of 8085 Microprocessor

Consider we have an address to be processed. Pin Diagram of Microprocessor and its description is as follows: They have higher priority than the INTR interrupt. This is a Write control signal active low.