e004065.pdf

RSC-164

Integrated Circuits

Special Functions

DATASHEET 4/2000

RSC-164

Integrated Circuits

Special Functions

DATASHEET 4/2000

RSC-164

General Purpose Microcontroller Featuring Speech

Recognition, Speech & Music Synthesis, Speaker

Verification and Audio Record/Playback

built with few additional parts other than a battery,

speaker, microphone, and audio input support cir-

cuitry. Low power requirements make the RSC-

164 an ideal solution for battery-powered and

hand-held devices.

Manufacturer

Sensory, Inc., 521 East Weddell Drive, Sunnyvale,

CA 94089, USA. Tel. (408) 744-9000, fax (408)

744-1299. Internet: http://www.sensoryinc.com

Features

Full Range of Speech Capabilities

- Speaker-independent speech recognition

- Speaker-dependent speech recognition

- High quality speech synthesis and sound effects

- Speaker verification

- Four-voice music synthesis

- Voice record & playback

Application example

Voice recognition with VoiceDirect, Elektor Elec-

tronics May 2000.

General description

The RSC-164, from the Interactive Speech™ family

of products, is a low-cost microcontroller designed

for use in consumer electronics. The RSC-164

combines an 8-bit microcontroller with high-quality

speaker-independent and speaker-dependent

speech recognition, speech synthesis, speaker veri-

fication, four-voice music synthesis, and voice

record and playback. Products can use one or all of

the RSC-164 features in a single application.

The RSC-164 employs a sophisticated neural net-

work that learns to classify sound data. On-chip

speech recognition algorithms reach an accuracy of

greater than 96% for speaker-independent recogni-

tion and greater than 99% for speaker-dependent

recognition. Sensory’s neural network approach

(patent pending) eliminates the need for expensive

signal processing or extensive RAM storage.

The highly-integrated nature of the chip reduces

external parts count. A complete system may be

Integrated Single-Chip Solution

- 4 MIPS 8-bit microcontroller

- On-chip A/D and D/A converters, digital filtering

- 32kHz clock for time keeping

- Internal 64kbytes ROM; 384 bytes RAM

- 16 general purpose I/O lines

- External memory bus: 16-bit Address, 8-bit Data

- On-chip output amplifier for direct speaker drive

Low Power Requirements

- 3.5 - 5.0V supply

- approx. 10mA operating

RSC-164 Instruction set

The instruction set for the RSC-164 has 52 instruc-

tions comprising 8 move, 7 rotate, 11 branch, 11

miscellaneous instructions. All instructions are 3

Die-bond pad, PLCC and QFP pin drawings

RSC-164

Integrated Circuits

Special Functions

DATASHEET 4/2000

RSC-164

Integrated Circuits

Special Functions

DATASHEET 4/2000

bytes or fewer, and no instruction requires more

than 8 clock cycles to execute.

Oscillators

Two independent oscillators in the RSC-164 pro-

vide a high-frequency clock and a 32kHz time-

keeping clock. The oscillator characteristics are as

follows:

- Oscillator #1: Pins XI1, XO1

14.32 MHz (3.5V-5.0V)

- Oscillator #2 Pins XI2 and XO2

32768 Hz (3.5V-5.0V)

two timers consists of an 8-bit reload value register

and an 8-bit up-counter.

The reload register is readable and writeable by

the processor.

General purpose I/O

The RSC-164 has 16 general purpose I/O pins

(P0.0-P0.7, P1.0-P1.7). Each pin can be pro-

grammed as an input with weak pull-up (~200k Ω

equivalent device); input with strong pull-up

(~10k Ω equivalent device); input without pull-up,

or as an output. This is accomplished by having 32

bits of configuration registers for the I/O pins (Port

Control Register A and Port Control Register B for

ports 0 and 1).

Interrupts

The RSC-164 allows for five interrupt sources, as

selected by software. Each has its own mask bit

and request bit in the IMR and IRQ registers

respectively.

The following events can generate interrupts:

- Positive edge on Port 0, bit 0

- Overflow of Timer 1

- Overflow of Timer 2

- Sensory reserved functions

- Completion of PWM sample period

Oscillator #1 works with an external crystal, a

ceramic resonator or LC. Use of Oscillator #2

requires a crystal for precision timing.

External memory

The RSC-164 includes an external memory inter-

face that allows connection with memory devices

for speaker-dependent speech recognition, audio

record/playback, extended durations of speech and

music synthesis, and enhanced product functionali-

ty. Separate data and address buses allow use of

standard EPROMs, ROMs, SRAMs, and flash mem-

ory with little or no additional decoding. Provision

of separate read and write signals for each external

memory space further simplifies interfacing. The

RSC-164 includes 8 data lines (D[7:0]) and 16

address lines (A[15:0]), along with associated con-

trol signals for interfacing to external memory.

Using flash memory and EEPROM will require cus-

tom code development. The RSC-164 can connect

serially through two I/O lines to a serial EEPROM

for applications with low data storage requirements.

Clock

The RSC-164 uses a fully static core — the proces-

sor can be stopped (by removing the clock source)

and restarted without causing a reset or losing

contents of internal registers. Static operation is

guaranteed from DC to 14.32 MHz.

Typically the processor clock runs from a

14.32 MHz crystal with no divisor and one wait

state. This creates internal RAM cycles of 70 nsec

duration and internal ROM or external cycles of

140 ns duration. Careful design of external decod-

ing logic and close analysis of gate delays may allow

operation with memories having access times as

slow as 120 ns.

Analog output

The RSC-164 offers two separate options for ana-

log output. The DAC (Digital to Analog Converter)

output provides a general purpose 10-bit analog

output that may be used for speech output (with

the inclusion of an audio amplifier), or other pur-

poses requiring an analog waveform. For speech

applications that require driving a small speaker,

the PWM (Pulse-Width Modulator) output can be

used instead of the DAC output. The PWM output

can directly drive a 32 ohm speaker.

RSC-164 Architecture

Timers/counters

The two independent oscillators of the RSC-164

provide counts to two internal timers. Each of the

DC Characteristics (T0 = 0ºC to +70ºC, V dd = 5V)

SYMBOL PARAMETER

MIN

TYP

MAX UNITS

TEST CONDITIONS

V IL

Input Low Voltage

–0.1

0.75

V IH

Input High Voltage

2.5

Vdd+0.5

V OL

Output Low Voltage

0.3

0.5

I OL = 4 mA

V OH

Output High Voltage

4.0

4.3

I OL = –4 mA

I IL

Logical 0 Input Current

I CC1

Digital Supply Current

Osc1 Freq=14.32 MHz,

CPU clock divide by 1

I CC2

Analog Supply Current

0.15

Osc1 Freq=14.32 MHz,

CPU clock divide by 1

I CC3

Digital Supply Current, Standby

Power-down mode

I CC4

Analog Supply Current, Standby

Power-down mode

External read timing External write timing

Rpu

Pull-up resistance P0.0-P1.7

400

Hi-Z

Ω

selected with software

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