Texas Instruments MSP53C391 User manual

MSP53C391 and MSP53C392
Speech Synthesizers
User’s Guide
May 2000
SPSU016A
Printed on Recycled Paper

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Copyright 2000, Texas Instruments Incorporated

iii Read This First
Preface
Read This First
How to Use This Manual
This document contains the following chapters:
Chapter 1 –Introduction to the MSP53C391 and MSP53C392 Speech
Synthesizers
Chapter 2 –MSP53C391 Hardware Description
Chapter 3 –MSP53C392 Hardware Description
Chapter 4 –MSP53C391 and MSP53C392 Software Description
Appendix A –Editing Tools and Data Preparation
Appendix B –FM Synthesis
Appendix C –Listing of FMequM2.inc
Appendix D –MSP53C391/392 Timing Considerations
Appendix E –Listing of FM2INTR1.inc
Appendix F –MSP53C391 and MSP53C392 Data Sheet
Related Documentation From Texas Instruments
MSP50x3x Mixed-Signal Processor User’s Guide
(Literature Number SLOU006B)

iv

Contents
v
Contents
1 Introduction to the MSP53C391 and MSP53C392 Speech Synthesizers 1-1. . . . . . . . . . . . . .
1.1 Description 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 MSP53C391 and MSP53C392 Comparison 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 Pin Assignments and Description 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5 D/A Information 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6 Algorithms Supported 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 MSP53C391 Hardware Description 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 MSP53C391 Interface Overview 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Signal Description 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Master Microprocessor Interface Description 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.1 Method 1: Polling 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.2 Method 2: Interrupt 1 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.3 Method 3: Interrupt 2 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Master Microprocessor Interface Timing 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.1 Timing Method 1: Polling 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.2 Timing Method 2: Interrupt 1 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.3 Timing Method 3: Interrupt 2 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 MSP53C391 Device Initialization 2-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 MSP53C392 Hardware Description 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Interface Overview 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Signal Description 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Master Microprocessor Interface Description 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.1 Method 1: Polling 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Master Microprocessor Interface Timing 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.1 Timing Method 1: Polling 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5 MSP53C392 Device Initialization 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 MSP53C391 AND MSP53C392 Software Description 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Software Overview 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Command Sequence 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Command Header 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 Data Streams 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.1 Synthesis Selection Codes 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
vi
4.5 Command Sequences 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.1 Command Codes 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.2 Pin Expansion 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.3 Volume Control 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.4 Low-Power Sleep State 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.5 Request Software Version 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.6 Generate Test Signal 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A Editing Tools and Data Preparation A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1 Editing Tools A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.1 WINSDS A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.1.2 SDS3000 A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.2 Data Preparation A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.2.1 LPC A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.2.2 MELP and CELP A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.2.3 PCM A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.2.4 FM A-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B FM Synthesis B-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.1 FM Synthesis Overview B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2 FM Synthesis Format and Commands B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2.1 Musical Notes B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2.2 Tempo Control B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2.3 Tempo Synchronization B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2.4 LOADTIMBRE Command B-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2.5 Transposition B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2.6 DETUNE B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2.7 Adjust Output Volume B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2.8 Modulation Index Adjustment B-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2.9 End of Song B-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2.10 Command Summary B-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.3 FM Synthesis Data Structure B-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.4 Data Preparation of FM Synthesis B-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.4.1 MD2FM Software B-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.4.2 FM2MERGE Software B-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.4.3 Assembler B-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C Listing of FMequM2.inc C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C.1 Listing of FMequM2.inc C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D MSP53C391/392 Timing Considerations D-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D.1 General Constraints D-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D.2 MSP53C391 Timing Waveforms D-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D.3 MSP53C392 Timing Waveforms D-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures
vii Contents
E Listing of FMequM2.inc E-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E.1 Listing of FM2INTR1.inc E-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F MSP53C391 and MSP53C392 Data Sheet F-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F.1 MSP53C31 and MSP53C32 Data Sheet F-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures
1–1 MSP53C391 Pin Assignments 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–2 MSP53C392 Pin Assignments 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 MSP53C391 Interfacing Diagram (Method 1: Polling) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 MSP53C391 Interfacing Diagram (Method 2: Interrupt 1) 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 MSP53C391 Interfacing Diagram (Method 3: Interrupt 2) 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . .
B–1 FM Conversion Process B-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
1–1 MSP53C391 and MSP53C392 Comparison 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–2 MSP53C391 Terminal Functions 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–3 MSP53C392 Terminal Functions 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 MSP53C391 Signal Description 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 MSP53C392 Signal Description 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–1 Speech Initiation Data 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–2 Synthesis Selection Codes 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–3 Command Sequence 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–4 Command Codes 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–5 Pin Expansion Command Codes 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–6 Volume Control Commands 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4–7 Volume Control Code Ranges 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B–1 Command Summary B-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Introduction to the MSP53C391 and
MSP53C392 Speech Synthesizers
Topic Page
1.1 Description 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Features 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 MSP53C391 and MSP53C392 Comparison 1–3. . . . . . . . . . . . . . . . . . . . . .
1.4 Pin Assignments and Description 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5 D/A Information 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5 Algorithms Supported 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Description
1-2
1.1 Description
MSP53C391 and MSP53C392 are standard slave synthesizers from Texas
Instruments that accept compressed speech data from another microproces-
sor and produce speech with that data. This allows the MSP53C391 and
MSP53C392 to be used with a master microprocessor in the various speech
products including electronic learning aids, games, and toys.
The TI MSP53C391 and MSP53C392 support several different speech syn-
thesis algorithms to permit tradeoffs to meet the different price performance
requirements of different markets. They also incorporate a two-channel FM
synthesis routine for music generation.
Both the MSP53C391 and MSP53C392 are special programs that run on the
MSP50C3x device. For more information about the MSP50C3x, please refer
to the
MSP50x3x User’s Guide (literature number: SLOU006B)
1.2 Features
Wide ranges of algorithms are incorporated in one chip. This allows the
user to choose from a low bit rate to high-quality synthesizing routines for
their application. Algorithms included are:
LPC 5220, LPC D6
MELP v4.1
CELP v3.4, 4.2 kbps, 4.8 kbps, 6.2 kbps, 8.6 kbps, 10.7 kbps
8-bit PCM
FM II
Software selectable 8-kHz or 10-kHz speech sample rate
Three different interface options to support different pin count require-
ments
32-Ωspeaker direct drive capability
Internally generated clock requires no external components
Maximum 10-µA standby current in sleep mode
Digital volume control
Built-in, two general-purpose output pins for MSP53C391 pin expansion

MSP53C391 and MSP53C392 Comparison
1-3 Introduction to the MSP53C391 and MSP53C392 Speech Synthesizers
1.3 MSP53C391 and MSP53C392 Comparison
The MSP53C391 is optimized to support a 4-bit wide data transfer protocol.
The MSP53C392 is optimized to support an 8-bit wide data transfer protocol.
The use of the 4-bit wide protocol in the MSP53C391 frees up some I/O pins
thatcanbeusedforotherpurposes.Thesepins(EOSandBUSY)canbeused
to simplify the interface by minimizing the need to periodically poll the
MSP53C391 for its current status.
Theuseofthe8-bitwideprotocolintheMSP53C392providesamoreefficient
data transfer.
A detailed comparison of the two devices is listed in Table 1–1.
Table 1–1. MSP53C391 and MSP53C392 Comparison
MSP53C391 MSP53C392
Number of Data Lines 4 bit 8 bit
Number of Control Lines 2 (Strobe & R/W) 2 (Strobe & R/W)
Data Request Supported N/A
Separate EOS Line for Detecting
End-of-Speech Supported N/A
Pin Expansion Two expansion pins N/A