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介绍了一种由可编程计数器８２５３芯片和ＣＭＯＳ锁相环４０４６芯片组成的频率转换电路，频率转换的比例可实时控制，硬件和软件简单、可靠。
A frequency conversion circuit composed of a programmable counter 8253 chip and a CMOS phase locked loop 4046 chip is introduced. The ratio of frequency conversion can be controlled in real time. The hardware and software are simple and reliable.