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I am trying to make a mini project with attiny84 and I searched the web so I can make an arduino on breadboard. What I saw on the internet is that they didnt use crystal. Is it mandatory if I want to use 1 pwm pin and the SPI interface on the attiny84?

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Only if you need crystal accuracy. If the internal RC oscillator is accurate enough then feel free to use it instead.

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  • Is there any way that i should anable the internal oscillator from the arduino IDE? – Christos Mitsis May 27 '15 at 17:14
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    The Arduino IDE has no way to manipulate the fuses without using a programmer. And even with one, you can only modify them to the values set in boards.txt. – Ignacio Vazquez-Abrams May 27 '15 at 17:18
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    Just to add. The internal oscillator runs at 8mHz, while most arduino boards have a 16mHz crystal. So you lose half the processing speed. In most cases this is not a big deal. On the plus side, it reduces the power usage a bit, and you can use those 2 crystal pins for something else. – Gerben May 27 '15 at 17:37

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