My question is, how do I know what the input CLK frequency should be?

我的问题是，我怎么知道输入时钟频率应该是多少？

youdao

The output of the CLK pin will be set to the crystal frequency.

该clk引脚输出将被设置为晶振频率。

youdao

CLK signal generator with adjustable frequency, gradually changing the frequency of observed changes in scan frequency effect on the output.

CLK采用频率可调信号发生器，逐渐改变频率，观察扫描频率的改变对输出效果的影响。

youdao

They want to speak to the driver of a blue X-registered Mercedes 230 CLK that was seen driving with the Seat Leon immediately before the incident.

BBC: Halifax car crash: Mother killed, six men arrested

Smaller than the larger and swanker CL- and SL-Class models and larger and costlier than the two-seat SLK-Class, the since-discontinued midsize Mercdes-Benz CLK-Class can be found in both sporty luxury coupe and convertible versions.

FORBES: Mercedes-Benz CLK-Class

So we see boring names like CTS, EXT, LS, XLR and 3.2TL. It's an effort to copy Mercedes with its C and CLK and SLK. Letters are also big for super high-powered jobs, like M (on BMWs) or V (on the Cadillac CTS) or R (on Volvo).

FORBES: Nameplate Engineering Is Bad Business