说明：  使用单片机，正弦波发生器，key0口按键减小输出频率，key1口按键增加输出频率 sinout口输出正弦波，（cosout口输出余弦波），使用定时器T0，16位定时模式。 R6、R7用作10毫秒延时寄存器。Fout输出方波。且输出的正弦波在0.01-83Hz范围内，方波在1.3Hz-10.6kHz范围内。
(The use of single-chip, sine wave generator, key0 I reduce the output frequency keys, key1 I button to increase the output frequency sinout I output sine wave, (cosout I output cosine wave), the use of timer T0, 16 bit mode. R6, R7 register for the 10 ms delay. Fout output square wave. And the sine wave output in the range of 0.01-83Hz, square-wave in the range of 1.3Hz-10.6kHz.)