SN8A1702AX datasheet(60/145 Pages) SONIX

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SN8P1700

8-bit micro-controller build-in 12-bit ADC

SONiX TECHNOLOGY CO., LTD

Page 60

Revision 1.94

EXTERNAL HIGH-SPEED OSCILLATOR

SN8P1700 can be operated in four different oscillator modes. There are external RC oscillator modes, high

crystal/resonator mode (12M code option), standard crystal/resonator mode (4M code option) and low crystal mode

(32K code option). For different application, the users can select one of satiable oscillator mode by programming code

option to generate system high-speed clock source after reset.

Example: Stop external high-speed oscillator.

B0BSET

FSTPHX

; To stop external high-speed oscillator only.

B0BSET

FCPUM0

; To stop external high-speed oscillator and internal low-speed

; oscillator called power down mode (sleep mode).

OSCILLATOR MODE CODE OPTION

SN8P1700 has four oscillator modes for different applications. These modes are 4M, 12M, 32K and RC. The main

purpose is to support different oscillator types and frequencies. High-speed crystal needs more current but the low one

doesn’t. For crystals, there are three steps to select. If the oscillator is RC type, to select “RC” and the system will

divide the frequency by 2 automatically. User can select oscillator mode from Code Option table before compiling. The

table is as follow.

Code Option

Oscillator Mode

Remark

RC mode

Output the Fcpu square wave from Xout pin.

32K

32768Hz

12M

12MHz ~ 16MHz

3.58MHz

OSCILLATOR DEVIDE BY 2 CODE OPTION

SN8P1700 has an external clock divide by 2 function. It is a code option called “High_Clk / 2”. If “High_Clk / 2” is

enabled, the external clock frequency is divided by 8 for the Fcpu. Fcpu is equal to Fosc/8. If “High_Clk / 2” is disabled,

the external clock frequency is divided by 4 for the Fcpu. The Fcpu is equal to Fosc/4.

Note: In RC mode, “High_Clk / 2” is always enabled.

OSCILLATOR SAFE GUARD CODE OPTION

SN8P1700 builds in an oscillator safe guard (OSG) to make oscillator more stable. It is a low-pass filter circuit and

stops high frequency noise into system from external oscillator circuit. This function makes system to work better under

AC noisy conditions.

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