SN8P1602B View Datasheet(PDF) - Sonix Technology Co., Ltd
Part Name
Description
MFG CO.
'SN8P1602B' PDF : 76 Pages View PDF
SN8P1602B
8-Bit Micro-Controller
INTERNAL LOW-SPEED OSCILLATOR
The internal low-speed oscillator is built in the micro-controller. The low-speed clock source is a RC type oscillator
circuit.
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
register.
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 RC vs. VDD
40
38.678
35
35.343
32.008
30
28.673
25
25.338
22.003
20
18.668
15
15.333
11.998
10
8.663
7.329
5
0
1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 6.00 6.50
VDD (Volts)
Example: Measure the internal RC frequency by instruction cycle (Fcpu). The internal RC frequency is the
Fcpu multiplied by 4. 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
B0BSET
B0BCLR
JMP
FCLKMD
P1.0
P1.0
@B
; Switch the system clock to internal low-speed clock mode.
; Output Fcpu toggle signal in low-speed clock mode.
; Measure the Fcpu frequency by oscilloscope.
SONiX TECHNOLOGY CO., LTD
Page 43
Version 1.2
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