TM4C129ENCZAD: What is the desired frequency of the connected crystal unit?

Hello, Thank you for your reply!

I understand about the frequency of the crystal oscillator.

After hearing your story, I was wondering, would my use case require a 30 MHz crystal?
Even if it is necessary, it may not be possible to change the oscillator, so please let me know if there is a way to do it without changing it.

(USE CASE)
I would like to TM4C129ENCZAD as serial converter.
(Transfer data between other IC and PC by converting from UART to USB or from USB to UART.)

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By the way, MOSC means that it connects to the OSC0 pin and the OSC1 pin.

Hi, I'm connecting a 16 MHz one at design time.

However, I have not used the crystal unit tested by TI in the datasheet.

Do you have any problems?
I have connected 10 pF capacitors C1 and C2 next to the crystal.

(Datasheet for the crystal I'm using)
www.jauch.com/.../jxs21wa-20161222.pdf

The name is Q 16,0-JXS21-8-10/10-W.

Hi,

Hiroyuki Kanematu said:

After hearing your story, I was wondering, would my use case require a 30 MHz crystal?
Even if it is necessary, it may not be possible to change the oscillator, so please let me know if there is a way to do it without changing it.

You don't need a 30Mhz crystal. What I was showing was the system clock must be higher than 30Mhz, not the crystal. The system clock is generated by the internal PLL taking MOSC (between 5 to 25Mhz) as an input. 

Hiroyuki Kanematu said:

Hi, I'm connecting a 16 MHz one at design time.

However, I have not used the crystal unit tested by TI in the datasheet.

Do you have any problems?

I don't see a problem using 16Mhz MOSC. 

OK, Thank you!

So you're saying there's no problem even if you're not using the recommended oscillator for testing that's listed in the datasheet?

Hi,

Hiroyuki Kanematu said:

So you're saying there's no problem even if you're not using the recommended oscillator for testing that's listed in the datasheet?

In the datasheet, it lists part numbers of crystals that have been simulated and confirmed to operate within the specifications shown for Main Oscillator Input Characteristics.  Other crystals that have nearly identical crystal parameters can be expected to work as well.

OK, Thank you!