Preliminary
SNC749
16-bit Voice Processor
6. System Clock
The system clock had dual source high clock and low clock input, user can selected
from 16Mhz crystal or ROSC for high clock and 32768 crystal for low clock. In Normal
mode, user can select high clock source from 16Mhz crystal or ROSC, In Slow mode,
user must select 32768 crystal to input system clock.
6.1 Crystal Input
GND
CKSEL
High Clock
Low Clock
6.2 ROSC Input
User uses ROSC mode to make High clock. The internal clock is reference clock from
32768 X’tal to fine tune to 16MHz. So, when ROSC mode is select, the 32768 X’tal
must provide reference clock to system.
VDD
CKSEL
C7
LXIN
NC
XIN
15 PF
C8
Y2
32768
LXOUT
15 PF
NC
XOUT
HIGH Clock
LOW Clock
Ver. 1.8
8
March 6, 2007
SONIX [ SONIX TECHNOLOGY COMPANY ]
