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SN74F161A: 关于这个计数器应用

Part Number: SN74F161A

这块有个应用问题,我有一个27MHZ±1K的方波信号,需要知道确切值,想送入单片机测试频率,这个信号对单片机来讲太快了,所以想用161来降低频率,如果这个27M信号从CLK输入,ENP 与ENT一直保持高,是不是QA的输出一直是CLK的1/2频率,QB一直是CLK的1/4倍频率。

有点着急,忘各位给个解答,感谢。