BCD number conversion realizes the conversion from binary system to decimal system by consecutive subtractions.
十进制转换模块采用了连减法，实现了二进制数向十进制数的转换；
The decipher circuit of the counter : Count deciphers and integrate on the chip together, count the pulse number in unit time, count the result of the decimal counter to translate into BCD yard;
计数器译码电路：计数译码集成在一块芯片上，计单位时间内脉冲个数，把十进制计数器计数结果译成BCD码；
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