How to setting CY51x7 for different crystal source?

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chi3769
Level 1
Level 1
First question asked Welcome!

我們使用了 CY51x7 IC,我們嘗試將低頻晶振設置為 LFF 模式。

我們要使用 50MHz 的晶振,我們按照 LFF 晶振的振盪器相關參數設置。

我們設置振盪器相關參數和 XT-Pattern。

我們發現如果我們使用 XO_DOUBLER_ENB =1(禁用),我們可以獲得 50MHz 輸出,但如果我們使用 XO_DOUBLER_ENB=0(啟用),我們無法獲得 100MHz 頻率輸出。x

我們如何獲得正確的參數?我們在編程規範中找不到更詳細的寄存器信息,如 XO_CAP 和 XO_AMPLICE。如何獲得更詳細的信息?

 

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1 Solution
Ritwick_S
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100 solutions authored 25 likes received 250 sign-ins

Hi @chi3769,

 

If you enable the XO_DOUBLER_ENB bit, it won't double the output frequency. It will just double the input frequency for all the calculations.

Below is one of the calculation examples from the programming specs.

ritwicksharma_1-1659441892602.png

 

Thanks,

Ritwick

 

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Ritwick_S
Moderator
Moderator
Moderator
100 solutions authored 25 likes received 250 sign-ins

Hi @chi3769,

 

If you enable the XO_DOUBLER_ENB bit, it won't double the output frequency. It will just double the input frequency for all the calculations.

Below is one of the calculation examples from the programming specs.

ritwicksharma_1-1659441892602.png

 

Thanks,

Ritwick

 

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