SNC201S

Direct Drive Speech Controller

Ver: 1.2

Sept 20, 2007

4

5.

5.

5.

5.

FUNCTION DESCRIPTIONS

5.1. Oscillator

SNC201S accept RC type oscillator for system clock. The typical circuit diagram for

oscillator is listed as follow.

5.2. ROM

SNC201S contains substantial 10K words (10-bit) internal ROM. Program, voices and

other data are shared with this same 10K words ROM.

5.3. RAM

SNC201S contains 32 nibbles RAM. The 32 nibbles RAM are divided into two pages

(page 0 and page 1, 16 nibble RAM on each page). In our programming structure,

users can easily define and locate RAM page in the program. For instance, users can

use the instructions, PAGEn (n=0 to 1) to switch and indicate the RAM page. Besides,

users can use direct mode, M0 ~ M15 in the data transfer type instructions, to access

all 16 nibbles of each page.

5.4. Power Down Mode

“End” instruction will power down SNC201S and enable IC to consume fewer current

for power saving. (<3uA @VDD=3V and <5uA @VDD=5V) Please be aware that

when the power down mode is activated in SNC201S, any valid data transition (L

H

or H

L) occurring on any IO pins of P3 will lead SNC201S back to normal operation

mode.

5.5. Sampling Rate Counters

The playing rate can be adaptively set up among from the wide ranges of 2.5KHz to

20KHz. This feature makes voice close to its original source and yield the better voice

quality.

OSC

VCC

RC Oscillator