12-04-2020, 01:06 PM
Wiki donne la réponse
12 MHz : Used in USB 1.0 and 2.0 systems (with accuracy of 500 ppm) as the reference clock for the full-speed PHY rate of 12 Mbit/s, or multiplied up using a PLL to clock high speed PHYs at 480 Mbit/s; common clock for Intel 8051 microprocessors;[18] also used in CAN bus systems. Common general microcontroller frequency. Common as cheap ceramic resonators where frequency stability is less concern than cost.
24 MHz : High-speed USB (24 MHz × 20 = 480Mbit/s); LCD monitor some MCU also Bluetooth headphones
https://en.m.wikipedia.org/wiki/Crystal_...requencies
12 MHz : Used in USB 1.0 and 2.0 systems (with accuracy of 500 ppm) as the reference clock for the full-speed PHY rate of 12 Mbit/s, or multiplied up using a PLL to clock high speed PHYs at 480 Mbit/s; common clock for Intel 8051 microprocessors;[18] also used in CAN bus systems. Common general microcontroller frequency. Common as cheap ceramic resonators where frequency stability is less concern than cost.
24 MHz : High-speed USB (24 MHz × 20 = 480Mbit/s); LCD monitor some MCU also Bluetooth headphones
https://en.m.wikipedia.org/wiki/Crystal_...requencies
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