I still do not convince.You may need a clock frequency out of the range of the internal versions, for one.
It just doesn't matter whether you are convinced or not. I guess you did not understand my point. The designers of the part are providing more than what you "need" at a very low marginal cost increment. Since they can do that it makes the part more flexible. IMHO an RC clock might not have suitable characteristics over time and temperature with respect to an external crystal oscillator for example. For other applications the long term accuracy of the clock might be a complete "don't care".I still do not convince.
STM32F405 datasheet says High-speed internal (HSI) RC oscillator (pade-103) is 16MHz and with PLL it can extended upto 168MHz so do we need external clock ?
Slightly off topic, but,There were so many early computers that ran at 3.579545MHz or 4.433619MHz (NTSC or PAL TV crystals) because those crystals were cheaper than a 4MHz crystal.
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