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f_test
- tsten通过对clk二分频,实现一秒钟的门脉冲,使被测频率通过,在这一秒钟内,通过计数器计数,实现频率的测定。-tsten half by clk frequency, achieving a second gate pulse to the measured frequency is, at this very moment, through the counter counts, the determination of frequency.