I/O并行口直接驱动LED显示 利用AT89S51单片机的P0端口的P0.0－P0.7连接到一个共阴数码管的a－h的笔段上，数码管的公共端接地。在数码管上循环显示0－9数字，时间间隔0.2秒。 -I/O parallel port directly drive LED display using AT89S51 MCU port P0 is connected to P0.0-P0.7 digital control of a total of yin a-h of the paragr

TM1722驱动笔段式液晶屏的程序，已经在STC89C52RC测试通过。-The TM1722 drive pen Segment LCD screen program has been through STC89C52RC test.

笔段式液晶程序，HT1621芯片驱动，根据自己的液晶进行数字建模，完美驱动，使用需更改建模数据-Pen Segment LCD procedures, HT1621 chipset driver, according to their own LCD digital modeling, perfect drive, use the need to change the data for modeling