# Uno R4 minima quartz or not

**URL:** <https://forum.arduino.cc/t/uno-r4-minima-quartz-or-not/1161067>\
**Category:** UNO R4 Minima\
**Created:** [August 23, 2023, 8:31am UTC](https://forum.arduino.cc/t/uno-r4-minima-quartz-or-not/1161067 "2023-08-23T08:31:00Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![ptillisch](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@ptillisch](https://forum.arduino.cc/u/ptillisch)\
**Post date:** [August 23, 2023, 8:37am UTC](https://forum.arduino.cc/t/uno-r4-minima-quartz-or-not/1161067/2 "2023-08-23T08:37:59Z")

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Hi @tonynyny. You might be interested in the related posts here:

> [@Uno R4 schematic](https://forum.arduino.cc/t/uno-r4-schematic/1160263):
>
> Schematic shows 16mhz main oscillator crystal. This appears not fitted. Should that be indicared on schematic? 16mhz is too fast for PLL input, would 12mhz be better? Schematic shows USB\_VBUS detecting +5v. Should this be connected to VUSB?

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