# Consequences of adding the missing oscillator?

**URL:** <https://forum.arduino.cc/t/consequences-of-adding-the-missing-oscillator/1171251>\
**Category:** UNO R4 Minima\
**Created:** [September 23, 2023, 3:17am UTC](https://forum.arduino.cc/t/consequences-of-adding-the-missing-oscillator/1171251 "2023-09-23T03:17:10Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Grumpy\_Mike](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/grumpy_mike/32/213521_2.png) [@Grumpy\_Mike](https://forum.arduino.cc/u/Grumpy_Mike)\
**Post date:** [September 24, 2023, 3:45am UTC](https://forum.arduino.cc/t/consequences-of-adding-the-missing-oscillator/1171251/4 "2023-09-24T03:45:39Z")

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Have a read of this thread, it has some very interesting points.  
[Uno R4 shematics](https://forum.arduino.cc/t/uno-r4-schematic/1160263)

I understand that the schematics have been updated since this thread with rather crude red crosses on the no fit components.

Also that a 16MHz crystal is too fast to operate the PLL and so this would slow down the actual running clock speed drastically.

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