SN8A1702AX datasheet(47/112 Pages) SONIX

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Preliminary

SN8P1702A/SN8P1703A

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

SONiX TECHNOLOGY CO., LTD

Page 47

Revision 0.5

INTERNAL LOW-SPEED OSCILLATOR

The internal low-speed oscillator is built in the micro-controller. The low-speed clock’s source is a RC type oscillator

circuit. The low-speed clock can supplies clock for system clock, timer counter, watchdog timer, SIO clock source and

so on.

Example: Stop internal low-speed oscillator.

B0BSET

FCPUM0

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

; oscillator called power down mode (sleep mode).

Note: The internal low-speed clock can’t be turned off individually. It is controlled by CPUM0 bit of OSCM

The low-speed oscillator uses RC type oscillator circuit. The frequency is affected by the voltage and temperature of

the system. In common condition, the frequency of the RC oscillator is about 16KHz at 3V and 32KHz at 5V. The

relative between the RC frequency and voltage is as following.

Internal RC vs. VDD

7.329

8.663

11.998

15.333

18.668

22.003

25.338

28.673

32.008

35.343

38.678

1.80

2.00

2.50

3.00

3.50

4.00

4.50

5.00

5.50

6.00

6.50

VDD (Volts)

Figure 7-5. Internal RC vs. VDD Diagram

Example: To measure the internal RC frequency is by instruction cycle (Fcpu). The internal RC frequency is

the Fcpu multiplied by 4. Therefore, we can get the Fosc frequency of internal RC from the Fcpu

frequency.

B0BSET

P1M.0

; Set P1.0 to be output mode for outputting Fcpu toggle signal.

B0BSET

FCLKMD

; Switch the system clock to internal low-speed clock mode.

@@:

B0BSET

P1.0

; Output Fcpu toggle signal in low-speed clock mode.

B0BCLR

P1.0

; Measure the Fcpu frequency by oscilloscope.

JMP

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