Different Modes. • Interfacing Examples Using PPI microprocessors. ➢ There are 24 I/O pins of the 82C55A make it compatible with the 3. Microprocessors and Microcontrollers/Interfacing with Lecture .. PIO . • The parallel input-output port chip is also called as programmable. Microprocessor | (programmable peripheral interface) · Interface with Subtract content of two ports by interfacing with microprocessor.

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8255A – Programmable Peripheral Interface

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Share buttons are a little bit lower. Published by Derick Warren Modified over 3 years ago. It has three 8-bit parallel ports: Ports A, B, and C can be individually programmed as input or output ports Port C is divided into two 4-bit ports which are independent from each other Mode 1: It is interfaclng technique.

Out of these 8 inputs only one can be selected for conversion by using 3 address lines A,B,C. The CPU may drive these lines using output port lines in case of multichannel applications. Port A acts as a 8-bit input data port to receive the digital data output from the ADC.


The DAC find applications in areas like Digitally controlled gains Motor speed controls Programmable gain amplifiers etc.

An operational amplifier is used as a current — to — voltage converter at the output of AD An external interfacinv resister acts to control the gain. CWR address is 86h.

It employs rotation of its shaft in terms of steps, rather than continuous rotation as in case of Intrefacing or DC motors. To rotate the shaft of the stepper motor, a sequence of pulses is needed to be applied to the windings of the stepper motor, in a proper sequence.

Interfacing with Microprocessor | Interfacing with

With a pulse applied to the winding input, the rotor rotates by one teeth position or an angle x. The angle x may be calculated as: Binary level pulses of v are required at its winding inputs to obtain the imcroprocessor of shafts.

The sequence of pulses can be decided, depending upon the required motion of the shaft. The count for rotating the shaft of the microprkcessor motor through a specified angle may be calculated from the no. In clockwise 5 rotations In anticlockwise 5 rotations. The port A address is h. The stepper motor has rotor teeth.


The stepper motor has an internal delay of 10msec. Assume that the routine for this delay is already available. Code Code segment Start: Design of Microprocessor-Based Systems Dr. My presentations Profile Feedback Log out. Auth with social network: Registration Forgot your password?

OK Programmable Interval Timer. About project SlidePlayer Terms of Service.

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