SMBP2501BPB datasheet(52/107 Pages) SONIX

52 / 107 page

SN8P2501B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 52

Version 2.1

4.5 SYSTEM LOW CLOCK

The system low clock source is the internal low-speed oscillator built in the micro-controller. 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 relation between the RC

frequency and voltage is as the following figure.

Internal Low RC Frequency

7.52

10.64

14.72

16.00

17.24

18.88

22.24

25.96

29.20

32.52

35.40

38.08

40.80

0.00

5.00

10.00

15.00

20.00

25.00

30.00

35.00

40.00

45.00

2.1 2.5

3.1 3.3 3.5

4.5

5.5

6.5

VDD (V)

ILRC

The internal low RC supports watchdog clock source and system slow mode controlled by CLKMD.



Flosc = Internal low RC oscillator (about 16KHz @3V, 32KHz @5V).



Slow mode Fcpu = Flosc / 4

There are two conditions to stop internal low RC. One is power down mode, and the other is green mode of 32K mode

and watchdog disable. If system is in 32K mode and watchdog disable, only 32K oscillator actives and system is under

low power consumption.



Example: Stop internal low-speed oscillator by power down mode.

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, CPUM1

(32K, watchdog disable) bits of OSCM register.

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