SN8F5708 datasheet(46/204 Pages) SONIX

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SN8F5708 Series

System Clock and Power Management

Datasheet Rev. 2.4

8.2 High Speed Clock and Real time clock

High-speed clock has internal and external two-type. The external high-speed clock includes 4MHz,

12MHz crystal/ceramic and external clock input mode. The internal high-speed oscillator is 32MHz

RC type. These high-speed oscillators are selected by SN8F5708_OPTIONS.A51.



IHRC 32M: The system high-speed clock source is internal high-speed 32MHz RC type

oscillator. In the mode, XIN and XOUT pins are bi-direction GPIO mode, and not to connect

any external oscillator device.



IHRC 32M with RTC: The system high-speed clock source is internal high-speed 32MHz RC

type oscillator. In the mode, the XIN and XOUT pins switch to crystal mode to drive an off-chip

32.768 kHz crystal.



X’tal 12M: The system high-speed clock source is external high-speed crystal/ceramic. The

oscillator bandwidth is 4MHz~16MHz and connected to XIN/XOUT pins with 20pF capacitors

to ground.



X’tal 4M: The system high-speed clock source is external high-speed crystal/resonator. The

oscillator bandwidth is 1MHz~4MHz and connected to XIN/XOUT pins with 20pF capacitors to

ground.



External Clock: The system high-speed clock source is external clock input mode. The input

signal only connects to XIN pin, and the XOUT pin is bi-direction GPIO mode.

MCU

VCC

GND

20pF

XIN

XOUT

VDD

20pF

CRYSTAL

MCU

XIN

XOUT

External

Clock

SN8F5708 supplies external low-speed clock (f RTC) for the real time clock of Timer 0. In IHRC 32M

with RTC mode, the XIN and XOUT pins switch to crystal mode to drive an off-chip 32.768 kHz

crystal. The crystal is connected to XIN/XOUT pins with 20pF capacitors to ground.

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