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Subject [GitHub] [incubator-nuttx] igrr commented on issue #413: esp32-core: Fix BOARD_CLOCK_FREQUENCY
Date Thu, 05 Mar 2020 10:00:20 GMT
igrr commented on issue #413: esp32-core: Fix BOARD_CLOCK_FREQUENCY
URL: https://github.com/apache/incubator-nuttx/pull/413#issuecomment-595138207
 
 
   > The frequency must match a clock source and if on the board is a 26MHZ quarts it it
impossible to get 80MHZ.
   
   On the ESP32, APB/CPU frequencies higher than the XTAL frequency are obtained using one
of the two PLLs. So either of 24 or 40 MHz XTAL can be used as clock source for the PLL. PLL
clock (320 or 480 MHz) is then internally divided to produce the CPU clock (80/160/240MHz)
and the APB clock (80MHz).

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