SN8F27E64KB datasheet(53/192 Pages) SONIX

53 / 192 page

SN8F27E60 Series

8-Bit Flash Micro-Controller with Embedded ICE and ISP

SONiX TECHNOLOGY CO., LTD

Page 53

Version 1.4

4.4.1 HIGH_CLK CODE OPTION

For difference clock functions, Sonix provides multi-type system high clock options controlled by

“High_CLK” code

option. The High_CLK code option defines the system oscillator types including IHRC_16M, IHRC_RTC, RC, 32K X

’tal,

12M X

’tal and 4M X’tal. These oscillator options support different bandwidth oscillator.



IHRC_16M: The system high-speed clock source is internal high-speed 16MHz RC type oscillator. In the mode,

XIN and XOUT pins are bi-direction GPIO mode, and not to connect any external oscillator device.



IHRC_RTC: The system high-speed clock source is internal high-speed 16MHz RC type oscillator. The RTC

clock source is external low-speed 32768Hz crystal. The XIN and XOUT pins are defined to drive external

32768Hz crystal and disables GPIO function.



RC: The system high-speed clock source is external low cost RC type oscillator. The RC oscillator circuit only

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



32K X

’tal: The system high-speed clock source is external low-speed 32768Hz crystal. The option only supports

32768Hz crystal and the RTC function is workable.



12M X

’tal: The system high-speed clock source is external high-speed crystal/ceramic. The oscillator bandwidth

is 10MHz~16MHz.



4M X

’tal: The system high-speed clock source is external high-speed crystal/resonator. The oscillator bandwidth

is 1MHz~10MHz.

For power consumption under

“IHRC_RTC” mode, the internal high-speed oscillator and internal low–speed oscillator

stops and only external 32KHz crystal actives under green mode. The condition is the watchdog timer can

’t be

“Always_On” option, or the internal low-speed oscillator actives.

4.4.2 INTERNAL HIGH-SPEED OSCILLATOR RC TYPE (IHRC)

The internal high-speed oscillator is 16MHz RC type. The accuracy is ±2% under commercial condition. When the

“High_CLK” code option is “IHRC_16M” or “IHRC_RTC”, the internal high-speed oscillator is enabled.



IHRC_16M: The system high-speed clock is internal 16MHz oscillator RC type. XIN/XOUT pins are general

purpose I/O pins.



IHRC_RTC: The system high-speed clock is internal 16MHz oscillator RC type, and the real time clock is external

32768Hz crystal. XIN/XOUT pins connect with external 32768Hz crystal.

4.4.3 EXTERNAL HIGH-SPEED OSCILLATOR

The external high-speed oscillator includes 4MHz, 12MHz, 32KHz and RC type. The 4MHz, 12MHz and 32KHz

oscillators support crystal and ceramic types connected to XIN/XOUT pins with 20pF capacitors to ground. The RC

type is a low cost RC circuit only connected to XIN pin. The capacitance is not below 100pF, and use the resistance to

decide the frequency.

4.4.4 EXTERNAL OSCILLATOR APPLICATION CIRCUIT

CRYSTAL/CERAMIC

RC Type

MCU

VCC

GND

20pF

XIN

XOUT

VDD

20pF

CRYSTAL

MCU

VCC

GND

XIN

XOUT

VDD

VSS



Note: Connect the Crystal/Ceramic and C as near as possible to the XIN/XOUT/VSS pins of

micro-controller. Connect the R and C as near as possible to the VDD pin of micro-controller.

SN8F27E64KB Datasheet(PDF) 53 Page - SONiX Technology Company

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