Preliminary

SNC729

16-bit Voice Processor

Ver. 1.6

March 7, 2007

8

CKSEL

GND

CKSEL

VDD

LXOUT

LXIN

XOUT

XIN

NC

NC

Y2

32768

C7

15 PF

C8

15 PF

HIGH Clock

LOW Clock

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

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.

High Clock

Low Clock