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AN2476 Datasheet(PDF) 11 Page - STMicroelectronics |
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AN2476 Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 49 page  AN2476 Power supply and clocks 11/49 1.7 Clocks The Clock controller provides the internal clocks needed by the different parts of the MCU: ● HCLK clocks all the peripherals mapped on the AHB bus ● PCLK clocks all the peripherals mapped on the APB bus ● CK_TIM clocks several timer counters independently from the APB clock ● CK_USB clocks the USB interface kernel 1.7.1 Clock overview Figure 7. Clock overview XT1 XT2 XRTC1 XRTC2 USB_CK OSC4M AHB & APB ~5 MHz UP TO 64 MHz 48 MHz 4 MHz NCKD FLAG HCLK PCLK CK_TIM UP TO 64 MHz UP TO 32 MHz UP TO 64 MHz DIVIDERs CK_USB 48 MHz RTC OSC32K LPOSC /128 32 kHz ALARM WAKEUP CK_SYS 300 kHz CLOCK DETECTOR PLL FREEOSC NCKD FLAG 0 1 DIV2 4/8MHz |
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