Measurement of Physical Quantities

Measurement of Physical Quantities: Measurement of Physical Quantities is given by Displacement Measurement Strain Measurement Force Measurement Torque Measurement Pressure Measurement Temperature Measurement Water-Level Indicator Measurement and Display of Speed of a Motor Nowadays, physical quantities such as force, displacement, acceleration, velocity, speed, temperature, pressure, flow and level, etc., are measured and displayed using microprocessors …

Measurement of Physical Quantities Read More »

Measurement of Electrical Quantities

Measurement of Electrical Quantities: Measurement of electrical quantities which includes Measurement of Voltage Measurement of Current Frequency Measurement Phase-Angle Measurement Power-Factor Measurement Impedance Measurement VA Measurement Power Measurement VAR Measurement Energy Measurement Measurement of Voltage Figure 10.9 shows the schematic block diagram of dc voltage measurement. Firstly, the dc voltage is applied to the peak …

Measurement of Electrical Quantities Read More »

Pin diagram of 8089 Processor

Pin diagram of 8089 Processor: Pin diagram of 8089 Processor – In a microprocessor-based system, there are many peripheral devices which are interconnected with the main processor as shown in Fig. 9.102(a). To perform any operation related to peripheral devices, the CPU must initiate the specified operation and also track their operations. After completion of …

Pin diagram of 8089 Processor Read More »

Pin Diagram of 8250 UART

Pin Diagram of 8250 UART: Pin Diagram of 8250 UART – The UART stands for Universal Asynchronous Receiver Transmitter. The UART is used in parallel-to-serial and serial-to-parallel conversions. Actually, UART receives data bytes from the computer and converts it into a single serial bitstream for outward transmission. During inward transmission of UART converts the serial …

Pin Diagram of 8250 UART Read More »

Bus Interface in Microprocessor

Bus Interface in Microprocessor: Bus Interface in Microprocessor – A microcomputer consists of a set of components such as CPU, memory, I/O device and these components communicate with each other to perform a specified task. The collection of paths which connect the vari­ous devices or modules is called the interconnection structure. The design of the …

Bus Interface in Microprocessor Read More »

Internal Architecture of 8275 CRT Controller

Internal Architecture of 8275 CRT Controller: The 8275 programmable CRT controller is a single-chip device that generates all the signals which are used for interfacing a microprocessor system. The main function of the 8275 CRT controller is to refresh the dis­play by buffering the information from the main memory. This is also used to keep …

Internal Architecture of 8275 CRT Controller Read More »

8253 Programmable Interval Timer

8253 Programmable Interval Timer: 8253 Programmable Interval Timer – In the process control system or automation industry, a number of operations are generally performed sequen­tially. Between two operations, a fixed time delay is specified. In a microprocessor-based system, time delay can be generated using software. Sequences of operations are also performed based on software. Therefore …

8253 Programmable Interval Timer Read More »

8255A Programmable Peripheral Interface

8255A Programmable Peripheral Interface: 8255 is a programmable peripheral interface IC and is a multiport input/output device. This is a general-purpose programmable I/O device, which may be used with many different microprocessors. There are 24 I/O pins, which may be individually programmed in 2 groups of 12 and used, in 3 major modes of operation. …

8255A Programmable Peripheral Interface Read More »

8259A Programmable Interrupt Controller

8259A Programmable Interrupt Controller: 8259A Programmable Interrupt Controller – Microprocessor-based system design requires many I/O devices such as keyboards, displays, sensors and other components. These devices should receive servicing in an efficient manner from the CPU. The most common method of servicing such devices is known as the polled approach. In this approach, the processor …

8259A Programmable Interrupt Controller Read More »