The HSI16 signal can also be used as a backup source (Auxiliary clock) if the HSE crystal However, even with calibration the frequency is less accurate than an external crystal It also has a faster startup time than the HSE crystal oscillator The HSI16 RC oscillator has the advantage of providing a clock source at low cost (noĮxternal components).

The HSI16 clock signal is generated from an internal 16 MHz RC Oscillator. In this mode the MSIĬan feed the USB device, saving the need of an external high-speed Hardware to reach better than ☐.25% accuracy.

System (LSE), the MSI frequency can be automatically trimmed by When a 32.768 kHz clock source is available in the (MSI), trimmable by software, able to generate 12 frequencies fromġ00 kHz to 48 MHz. 16 MHz high-speed internal RC oscillator (HSI16), trimmable by software, that can supply a PLL In a ST microcontroller I'm using there are two OSC's that can be routed to exactly the same hardware and I'm wondering when you would use each one.Įxcerpt from the data sheet about the two OSC's.

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