8085 Microprocessor

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Interrupts in 8085


An interrupt is a signal generated by an external device that prompts a microprocessor to perform a task. There are 5 interrupt signals, TRAP, RST 7.5, RST 6.5, RST 5.5 and INTR. Interrupts are subdivided according to their parameters into the following groups: Vector Interrupt - In this type of interrupt, the processor knows the interrupt address. For example: RST7.5, RST6.5, RST5.5, TRAP. Non-Vectorized Interrupts - In this type of interrupt, the processor does not [...]

Interrupts in 80852019-03-18T15:13:53+00:00

Intel 8255A – Programmable Peripheral Interface Pin Diagram


Intel 8255A - Programmable Peripheral Interface Pin Diagram Intel 8255A - Programmable Peripheral Interface used when we want control more than eight peripheral device. Suppose we want to control various device at a time like keyboard, printer, 7 segment display etc. then we need eight data bus of microprocessor at a time but here we have three peripheral so we require eight data bus for the keyboard, eight data bus for the printer eight data [...]

Intel 8255A – Programmable Peripheral Interface Pin Diagram2019-02-24T00:10:15+00:00

Intel 8255A – Programmable Peripheral Interface


The Intel 8255 (or i8255/onkyo tx 8255) Programmable Peripheral Interface (PPI) chip was developed and manufactured by Intel for the Intel 8080 microprocessor in the early 1970's. The 8255A is a programmable universal I / O device that allows the transfer of I / O data to an I / O interrupt when needed. It can be used with almost any microprocessor. It consists of three bidirectional 8-bit I / O ports (24 I / [...]

Intel 8255A – Programmable Peripheral Interface2019-02-23T23:56:20+00:00

Level Converter MAX232


Level converter MAX232 is very essential when we are interfacing the digital hardware (controller) to the computer via serial mode. The computer serial port use RS 232 protocol and controller works on the TTL logic. These two hardware need to synchronize with each other for the proper communications. To solve this problem MAX 232 IC is used, this IC convert RS232 signal to TTL and TTL to RS232. Hence we can exchange few [...]

Level Converter MAX2322017-04-19T10:36:27+00:00

History of microprocessor


History of microprocessor Contributor: Suryansh Gupta The first Microprocessor (4004) was designed by Intel in 1968. A Japanese Calculator manufacturer, BUSICOM approached Intel with a design for a small calculator which needs 12 custom chips.  Ted Hoff, an Intel Engineer thought that a general purpose logic device could replace the multiple components. This idea led to the development of a microprocessor. So, Microprocessors started with a modest beginning of drivers for calculators.  Intel introduced [...]

History of microprocessor2017-02-13T08:45:08+00:00

8085 Addressing modes with example and Instruction Size


ADDRESSING MODES The various ways of specifying data (or operands) for instructions are called as addressing modes. The 8085 addressing modes are classified into following types: Immediate addressing mode Direct addressing mode Register addressing mode Register indirect addressing mode Implicit addressing mode (i) Immediate Addressing mode In this mode operand is a part of the instruction itself is known as Immediate Addressing mode. If the immediate data is 8-bit, the instruction will be of two [...]

8085 Addressing modes with example and Instruction Size2015-02-10T15:23:22+00:00

8085 Microprocessor Interview Questions


What is flip-flop? A flip-flop is a binary cell capable of storing one bit of information. It has two outputs; one for the normal value and one for the complement value of the bit stored in it. . It has the property to remain in one state indefinitely until it is directed by an input signal to switch over to the other state. It is also called bistable multivibrator. The basic formation of flip flop [...]

8085 Microprocessor Interview Questions2015-01-29T14:04:37+00:00

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