SNC710

16-bit Voice Engine

I/O Pad

IREN

2

P0.15

Overflow

Timer2

P0.15 Modulated with a carry signal

4.5 Timer/Counter

SNC710 provides three 8-bit timer/event counters (T0/T1/T2). Each timer is 8-bit

binary up-count timer with pre-scalar and auto-reload function. Timer 0 (T0) is used

when voice playing, so user should avoid to use T0.

Auto-reload

clear

comparator

MU

/256

/8

/4

/2

If equal, Time out

8-bit Up

Counter

Enable

Pre-scalar

(system clock)/2*

TnC (8-bit)

4.6 DAC & PWM

To play out voices, SNC710 contains two different solutions, DAC and PWM, for the

users’ applications. The user can choose one of these two solutions in his design.

Only one function can be activated at one time.

DAC: A 10-bit current type digital-to-analog converter is built-in SNC710. The

relationship between of input digital data and output analog current signal is listed in

the following table. Also, the recommended application circuit is illustrated as

follows.

Ver. 1.3

April 3, 2003

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