SNC202
Direct Drive Speech Controller
5. FUNCTION DESCRIPTIONS
5.1. Oscillator
SNC202 accept RC type oscillator for system clock. The typical circuit diagram for
oscillator is listed as follow.
VCC
r
OSC
RC Oscillator
5.2. ROM
SNC202 contains substantial 20K words (10-bit) internal ROM. Program, voices and
other data are shared with this same 20K words ROM.
5.3. RAM
SNC202 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 SNC202 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 SNC202, any valid data transition (LꢁH or HꢁL)
occurring on any IO pins of P3 will lead SNC202 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.
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Ver: 1.1
June 8, 2005
SONIX [ SONIX TECHNOLOGY COMPANY ]
