SNC21168A
1-CH H.Q. Speech Controller
5. FUNCTION DESCRIPTIONS
5.1 Oscillator
System clock define 2MHz, the source provided by external resistor ring oscillator.
5.2 ROM
SNC21168A contains a substantial maximum 512K words (10-bit) internal ROM,
which is shared by program and resource data. Program, voice and data are shared
within this same 512K words ROM.
5.3 RAM
SNC21168A contains maximum 128 nibble RAM (128 x 4-bits). The 128 nibble RAM
is divided into eight pages (page 0 to page 7, 16 nibble RAM on each page). In our
programming structure, users can use the instructions, PAGE n (n=0 to 7) 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 makes the IC entering into Stop Mode will stop the system clock for
power savings (<3uA @VDD=3V and <6uA @VDD=4.5V.) Any valid data transition
(LꢂH or HꢂL) occurring on any IO pin can be used to start the system clock and
return to normal operating 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 architecture yields a
high-quality voice synthesis that sounds very close to its original source when played
through the same amplifier and speaker circuitry.
5.6 Auto Repeat Function
A voice section can be repeated by the built-in special hardware of SNC21168A
without any software effort. The function activated by setting the corresponding bit of
a control register. Once the control register was setting, the channel will continue to
play the voice section (the Next Section).
5.7 I/O Ports
There are four 4-bit I/O ports P1, P2, P3 and P6. Any I/O can be individually
programmed as either input pull low or output. Any valid data transition (Hꢂ L or
LꢂH) of P1, P2, P3 and P6 can reactivate the chip when it is in power-down stage.
5
Ver1.1
April 28, 2009
SONIX [ SONIX TECHNOLOGY COMPANY ]
