外文翻譯--基于單片機(jī)的學(xué)習(xí)式倒計(jì)時(shí)器(文件)
【正文】 y the microcontroller I/O port control signal is given, the driver countdown display. Accordingto the characteristics of studying method counting down display, the preparation of theinstruction in order to achieve the required system operation functions. Key words:MCU。③ Has many kinds of display modes, the system has 99 s,40 s,20 s,10 the s countdown pattern to be possible to supply the choice. The system installation is flexible, the modulation, the structurization, the extension are good, the movement is safely stable, is highly effective. 2 system system design and the hardware circuit countdown system (may also use at89S series) including the STC10F04XE monolithic integrated circuit, the eliminator supply electric circuit, to examine the electric circuit, the watchdog electric circuit, the driving circuit, the LED display circuit and so on. power circuit this countdown takes the electricity from the signal light, the signal lamp voltage is directly 220 V, after 18 V transformer voltage droppings the rectification bridge has given 7805, for monolithic integrated circuit use. Because has red, yellow, the green 3 kind of signal lights, altogether has used 3 18 V transformers, from red, green, the yellow light takes the electricity separately. examine the electric circuit in the study type countdown electric circuit, must the realtime examination traffic light time. Uses the light pair examination in here. When has the signal input, the light pair TIL117 5 feet (C) outputs for the low level signal, examines the low level through the monolithic integrated circuit the time is red candle39。s time and the demonstration should not surpass 2 signal periods, should demonstrate the black screen in the study countdown. After the road traffic signal cybertron interrupt output or changes over to yellow dodges the control, t
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