SN8F5708 datasheet(48/204 Pages) SONIX

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SN8F5708 Series

System Clock and Power Management

Datasheet Rev. 2.4

8.5 System Clock Timing

Parameter

Symbol

Description

Typical

Hardware

configuration time

Tcfg

8*FILRC+2

17*FIHRC

4.6ms @

FILRC = 16kHz &

FIHRC = 32MHz

Oscillator start up time

Tost

The start-up time is depended on

oscillator’s material, factory and

architecture. Normally, the low-speed

oscillator’s start-up time is lower than

high-speed oscillator. The RC type

oscillator’s start-up time is faster than

crystal type oscillator.

Oscillator warm-up

time

Tosp

Oscillator warm-up time of reset condition.

2048*Fhosc+ 5*FILRC

(Power on reset, LVD reset, watchdog reset,

external reset pin active.)

825us @ Fhosc =

4MHz

441us @ Fhosc =

16MHz

377us @ Fhosc =

32MHz

Oscillator warm-up time of power down

mode wake-up condition.

2048*Fhosc+ 5*FILRC……Crystal/resonator type

oscillator, e.g. 32768Hz crystal, 4MHz

crystal, 16MHz crystal…

64*Fhosc+ 5*FILRC……….RC type oscillator, e.g.

internal high-speed RC type oscillator.

X’tal:

825us @ Fhosc =

4MHz

441us @ Fhosc =

16MHz

RC:

315us @ Fhosc =

32MHz

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