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Primary clocks
– Slow clock: 32.768 kHz (±250 ppm)
• Used in RTC, Wi-Fi® beacon listen timing in low-power idle mode and some of the chip internal
sequencing
• On-chip, low-power 32-kHz crystal oscillator
• Support for externally-fed 32.768-kHz clock
• On-chip 32-kHz RC oscillator for initial wakeup
– Fast clock: 40 MHz (±20 ppm)
• Used in Wi-Fi® radio and MCU
• On-chip low phase-noise 40-MHz crystal oscillator
• Support for externally fed, clean 40-MHz clock (such as TCXO)
• System and peripheral clocks are derived from internal PLL producing 240 MHz
