robert-hh edc3f3d0d3 samd/clock_config: Extend the range of machine.freq(). ... The value given for machine.freq(f) is extend to the range of 1_000_000 to 200_000_000. Frequencies below 48 MHz will be forced to an integer fraction of 48 MHz. At frequencies below 8 MHz USB is switched off. The power consumption e.g. of ADAFRUIT_ITSYBITSY_M4_EXPRESS drops to about 1.5 mA at 1 MHz. Since the peripheral frequency is dropped as well, timing e.g. of PWM, UART, I2C and SPI is affected and frequency/baud rate has to set again after a frequency change below 48 MHz.		2022-10-25 22:38:45 +11:00
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samd21	samd/mcu: Use lf2s for SAMD51 and lfs1 for SAMD21.	2022-10-06 23:14:21 +11:00
samd51	samd/clock_config: Extend the range of machine.freq().	2022-10-25 22:38:45 +11:00