Preliminary
SN8P1702A/SN8P1703A
8-bit micro-controller build-in 12-bit ADC
7OSCILLATORS
OVERVIEW
The SN8P1702A/SN8P1703A highly performs the dual clock micro-controller system. The dual clocks are high-speed
clock and low-speed clock. The high-speed clock frequency is supplied through the external oscillator circuit. The
low-speed clock frequency is supplied through on-chip RC oscillator circuit.
The external high-speed clock and the internal low-speed clock can be system clock (Fosc). And the system clock is
divided by 4 to be the instruction cycle (Fcpu).
Fcpu = Fosc / 4
The system clock is required by the following peripheral modules:
ꢄ
ꢄ
ꢄ
ꢄ
ꢄ
Timer counter 0 (TC0/TC1)
Watchdog timer
AD converter
PWM output (PWM0/PWM1)
Buzzer output (TC0OUT/TC1OUT)
CLOCK BLOCK DIAGRAM
HXRC(1:0) is code option
•00= RC
•01 =32 Khz Oscillator
•10 = High Speed Oscillator (>10Mhz)
•11 = Standard Oscillator (4Mhz)
Divided by 2
1 : Disable
0 : Enable
STPHX HXRC
CLKMD
fosc/4
CPUM0
XIN
XOUT
HXOSC.
OSG
Divided by 2
fcpu
Divided by 4
fh
fl
OSG : Oscillator Safe Guard
1 : Disable -- System Default
0 : Enable
CPUM0
LXOSC.
CPUM0
Figure 7-1. Clock Block Diagram
ꢀ
ꢀ
ꢀ
HXOSC: External high-speed clock.
LXOSC: Internal low-speed clock.
OSG: Oscillator safe guard.
SONiX TECHNOLOGY CO., LTD
Page 42
Revision 0.5
SONIX [ SONIX TECHNOLOGY COMPANY ]
