本人写的CS1821测试DEMO程序，CS1821兼容HT1621-I write DEMO CS1821 test procedures, CS1821 compatible HT1621

定时中断。采用定时器T0，定时50ms，每次定时溢出引起中断，在中断程序中对计数器累加。每一秒LED亮0.2s，熄0.8s。 特色：低功耗。程序中技巧在于将1s分成cnt记20次，0.2秒占20 ，即中断的前4次都点亮，后16次都熄灭。-Interrupted from time to time. The use of timer T0, from time to time 50ms, each caused by overflow

单片机中断指令的C语言应用，三个数码管从“000”开始进行加法计数按动（INT0低电平）键时计数暂停，再按继续计数-Microcontroller interrupt instruction C-language application, the three digital control from the " 000" press start counting addition (INT0 low) key coun