Abstract
With the development of information technology, LED display as an important tool of information dissemination, has been widely used in major shopping malls, railway stations, docks, subway window and a variety of work and other public places, and have achieved good results.
This device use MCS-8051 microcontroller as the core chip circuitry to realize, hardware circuits mainly by the MCS-8051 microcontroller, programmable parallel I/O port device 8255, the clock chip DS12887, LED dot-matrix drive circuit And the expansion of memory M29F040, keyboard and the serial communication circuit. This device can also showed that eight Chinese characters, each Chinese character is 16 × 16 LED dot matrix consisting of a total of thirty two by 8 × 8 LED modules of a luminous dots. The dot matrix LED drive circuit used to drive out scanning in the machines set up a character and write Chinese characters by computer or through the key input, both in the devices. Dynamic scanning for the display of multi-screen rotation, according to the number of Chinese characters Volume Automatic Identification static display or the left dynamic display, and also can display time.
Key words: LED display; Single-chip-microprocessor; Driving circuit; Clock chip DS12887
