SNC208S
Direct Drive Speech Controller
5.
FUNCTION DESCRIPTIONS
5.1. Oscillator
SNC208S accept RC type oscillator for system clock. The typical circuit diagram for
oscillator is listed as follow.
VCC
OSC
RC Oscillator
5.2. ROM
SNC208S contains substantial 128K words (10-bit) internal ROM. Program, voices
and other data are shared with this same 128K words ROM.
5.3. RAM
SNC208S contains 48 nibbles RAM. The 48 nibbles RAM are divided into three pages
(page 0, page 1 and page 2, 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 2) to switch and indicate the RAM page.
Besides, users can use direct mode, M0 ~ M15 in the data transfer type instructions
(M15 is forbidden using for user in each page), to access all 16 nibbles of each page.
5.4. Power Down Mode
“End” instruction will power down SNC208S 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 SNC208S, any valid data transition (L H
or H L) occurring on any IO pins of P3 and P2 will lead SNC208S 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.
Ver: 0.3
4
r
Sept 20, 2007
SONIX [ SONIX TECHNOLOGY COMPANY ]
