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Clock settings: - GCLK0: 48 MHz (SAMD21) or 120 MHz(SAMD51). - GCLK1: 32768 Hz for driving the PLL. - GCLK2: 48 MHz for tzhe peripheral clock. - GCLK3: 1 MHz (SAMD21) or 8 MHz (SAMD51) for the µs ticks timer. - GCLK8: 1 kHz for WDT (SAMD21 only). If a 32 kHz crystal is present, it will be used as clock source. Otherwise the DFLL48M in open-loop mode is used. GCLK0 for SAM51 can be changed between 48 MHz and 200 MHz. The specified range is 96 MHz - 120 MHz.