![]() (LSE), the MSI can provide the USB device with very accurate clock removing the need for In addition, when trimmed by the 32.768 kHz external oscillator The MSI RC oscillator has the advantage of providing a low-cost (no external components) Twelve frequency ranges are available: 100 kHz, 200 kHz, 400 kHz, 800 kHz,ġ MHz, 2 MHz, 4 MHz (default value), 8 MHz, 16 MHz, 24 MHz, 32 MHz and 48 MHz. Its frequency range can beĪdjusted by software by using the MSIRANGE bits in the Clock control register The MSI clock signal is generated from an internal RC oscillator. Refer to reference manual section: Clock security system (CSS). 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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