SMBP2501BPB datasheet(48/107 Pages) SONIX

48 / 107 page

SN8P2501B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 48

Version 2.1

4.4 SYSTEM HIGH CLOCK

The system high clock is from internal 16MHz oscillator RC type or external oscillator. The high clock type is controlled

“High_Clk” code option.

High_Clk Code Option

Description

IHRC_16M

The high clock is internal 16MHz oscillator RC type. XIN and XOUT pins are general

purpose I/O pins.

Fcpu range is Fosc/4~Fosc/16 in IHRC_16M .

IHRC_RTC

The high clock is internal 16MHz oscillator RC type. XIN and XOUT pins connect

with 32768Hz crystal for RTC clock source.

Fcpu range is Fosc/4~Fosc/16 in IHRC_16M .

The high clock is external RC type oscillator. XOUT pin is general purpose I/O pin.

32K

The high clock is external 32768Hz low speed oscillator.

12M

The high clock is external high speed oscillator. The typical frequency is 12MHz.

The high clock is external oscillator. The typical frequency is 4MHz.

4.4.1 INTERNAL HIGH RC

The chip is built-in RC type internal high clock (16MHz) controlled by

“IHRC_16M” or “IHRC_RTC” code options. In

“IHRC_16M” mode, the system clock is from internal 16MHz RC type oscillator and XIN / XOUT pins are

general-purpose I/O pins. In

“IHRC_RTC” mode, the system clock is from internal 16MHz RC type oscillator and XIN /

XOUT pins are connected with external 32768 crystal for real time clock (RTC).



IHRC: High clock is internal 16MHz oscillator RC type. XIN/XOUT pins are general purpose I/O pins.



IHRC_RTC: High clock is internal 16MHz oscillator RC type. XIN/XOUT pins are connected with external

32768Hz crystal/ceramic oscillator for RTC clock source.

The RTC period is 0.5 sec and RTC timer is T0. Please consult

“T0 Timer” chapter to apply RTC function.



Note: In IHRC_16M and IHRC_RTC modes, the Fcpu is limited to Fosc/4~Fosc/16.

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