rsc-464 ETC-unknow, rsc-464 Datasheet - Page 5

• Manufacturer Part Number: rsc-464
• Description: Speech Recognition Processor
• Manufacturer: ETC-unknow






Preliminary Data Sheet
RSC-464 Architecture
The RSC-464 is a highly integrated speech and analog I/O mixed signal processor that combines:
Two bi-directional ports provide 16
configurable, general-purpose I/O
pins to communicate with or control
external devices with a variety of
source and sink currents. Up to 4 of
these
programmable Analog Comparator
inputs. 16 may be used as I/O
wakeup.
The RSC-464 has a high frequency
(14.32 MHz) clock as well as a low
frequency (32,768 Hz) clock. The
processor clock can be selected
from either source, with a selectable
divider value. The device performs
speech recognition when running at
14.32 MHz.
OSC1 is a very low-cost 3.58 MHz
crystal oscillator that is used by a
4X PLL to generate the 14.32MHz
clock. The OSC2 oscillator provides
the options of using an external
crystal or its own internal RC
devices (no external components
required for the internal RC mode).
There are three programmable,
general-purpose 8-bit counters /
timers – Timers 1 and 3 are derived
from
OSC2. There is also a Watchdog
timer that may be used to exit an
undesired condition in program flow,
and Multi-tasking timer to allow chip
operations to share resources in
parallel.
A single chip speech I/O solution may be created with the RSC-464. An external microphone passes an audio
signal to the preamplifier and ADC to convert the incoming speech signal into digital data. Speech features are
extracted using the Digital Filter engine. The microcontroller CPU processes these speech features using speech
recognition algorithms in firmware, with the help of the “L1” Vector Accelerator and enhanced instruction set. The
resulting speech recognition results may be used to control the consumer product application code, or to output
5
8-bit microcontroller with enhanced instructions and interrupt control, superior register architecture, independent
Digital Filter engine and “L1” Vector Math Accelerator
On-chip ROM and RAM (2.8 Kbytes).
Input microphone preamp and 16 bit Analog-to-Digital Converter (ADC) for speech and audio/analog input
10 bit Digital-to-Analog Converter (DAC), and 10 bit Pulse Width Modulator (PWM) to directly drive a speaker or
other analog device
Low power Audio Wakeup from power down mode, when a selected audio event, such as clap or whistle, occurs
OSC1,
I/O
may
and
be
Timer2
used
from
as
RSC-464 Internal Block Diagram
P/N 80-0282-A
© 2005 Sensory Inc.
RSC-464