Monthly Archives: June 2009

Chevrolet Optra SRV

By admin | Published: June 24, 2009
The Optra hatch is sold as the Lacetti in the UK and will feature the same engines that are available on the Optra. The positioning of the hatch will be as a aports recreational vehicles which will keep the SRV an aspirational car and let GM price it accordingly as well, getting people to pay [...]
Posted in Auto World | Tagged , , , , , , | Leave a comment

Chevrolet Aveo UV-A

By admin | Published: June 20, 2009
The hatchback is based on the old generation Aveo which is still sold in Europe and Asia as the Kalos. Its wheelbase of 2480mm is 25mm more than that of the Getz and 90mm more than that of the swift. It will be powered by a 1.4 litre engine from the same family of GM [...]
Posted in Auto World | Tagged , , , , , | Leave a comment

Features of Display controller 8279

By admin | Published: June 16, 2009
IC 8279 provides a scanned interface to a 64 contact key matrix, with two more keys CONTROL and SHIFT. It provides three input modes for keyboard interface. Scanned keyboard mode scanned sensor matrix mode strobed input mode. It has built in hardware to provide key debounce. It allows in key depression in 2 key lockout or N key rollover mode, which [...]
Posted in Display Contoller | Tagged , , | Leave a comment

Disadvantages of Software Approach

By admin | Published: June 12, 2009
In software approach to CPU has to look after digit selection in synchronosim with the data for specific digit. In other words, CPU has to give digit data on one port and then the digit selection bit pattern on the other port in synchronism. The process of refreshing has to be repeated all the time [...]
Posted in Display Interfacing | Tagged , , , , | 1 Comment

Interfacing Multiplexed Display

By admin | Published: June 8, 2009
To solve the problems of the static display approach, multiplexed display method is used. Here 4 seven segment displays connected using multiplexed method. Here common anode seven segment LEDs are used. Anodes are connected to +5V through transistors. Cathodes of all seven segments are connected in parallel and then to the output of 7447 IC [...]
Posted in Display Interfacing | Tagged , , , | Leave a comment

Display Interfacing

By admin | Published: June 4, 2009
Most of the microprocessor controlled instruments and machines need to display letters of the alphabet and numbers to give directions or data values to users. This information can be displayed using CRT , LED or LCD displays. CRT displays are used when a large amount of data is to be displayed. In systems where only [...]
Posted in Display Interfacing | Tagged , , , , , | Leave a comment