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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/rp2/quickref.rst | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/docs/rp2/quickref.rst b/docs/rp2/quickref.rst index ecf3f3186..9b82ea5dc 100644 --- a/docs/rp2/quickref.rst +++ b/docs/rp2/quickref.rst @@ -31,12 +31,25 @@ The MicroPython REPL is accessed via the USB serial port. Tab-completion is usef find out what methods an object has. Paste mode (ctrl-E) is useful to paste a large slab of Python code into the REPL. -The :mod:`machine` module:: +The :mod:`machine` module: + +machine.freq() allows to change the MCU frequency and control the peripheral +frequency for UART and SPI. Usage:: + + machine.freq(MCU_frequency[, peripheral_frequency=48_000_000]) + +The MCU frequency can be set in a range from less than 48 MHz to about 250MHz. +The default at boot time is 125 MHz. The peripheral frequency must be either +48 MHz or identical to the MCU frequency, with 48 MHz as the default. +If the peripheral frequency is changed, any already existing instance of +UART and SPI will change it's baud rate and may have to be re-configured:: import machine machine.freq() # get the current frequency of the CPU - machine.freq(240000000) # set the CPU frequency to 240 MHz + machine.freq(240000000) # set the CPU frequency to 240 MHz and keep + # the UART frequency at 48MHz + machine.freq(125000000, 125000000) # set the CPU and UART frequency to 125 MHz The :mod:`rp2` module:: |