SNC520
One Channel Direct Drive Speech Controller
5 FUNCTION DESCRIPTIONS
5.1. Oscillator
SNC520 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
SNC520 contains substantial 32K word (10-bit) internal ROM. Program and voices
are shared with this same 32K word ROM.
5.3. RAM
SNC520 contains 64 nibbles RAM. The 64 nibbles RAM are divided into four pages
(page 0 to page 3, 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 3) 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 SNC520 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 SNC520, any valid data transition (LꢁH or HꢁL)
occurring on any IO ports (P2 and P3) will lead SNC520 back to normal operation
mode.
5.5. Sampling Rate Counter
The unique sampling rate counter is designed in voice channel to be able to play
diverse voices at different sample playing rates. 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.
3
Ver: 1.0
November 26, 2002
SONIX [ SONIX TECHNOLOGY COMPANY ]
