Texas Instruments MSP430, MSP-STK430x320, MSP-EVK430x320 Series Manual

MSP430 Family

Evaluation Kit Manual

Starter Kit

1999 Mixed-Signal Products

SLAS191A

IMPORTANT NOTICE

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any product or service without notice, and advise customers to obtain the latest version of relevant information
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pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICA TIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERST OOD TO
BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
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Copyright  1999, Texas Instruments Incorporated

Contents

Section Title Page

1 Getting Started 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Installing the Software 1–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Hardware Installation 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.1 The STK/EVK-PCB Operating Conditions 1–2. . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.2 How to Install the Hardware 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.3 Programming the Monitor Software Into an

Erased EPROM (EVK Only) 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.4 MSP-STK/EVK430x320 Target Connectors 1–6. . . . . . . . . . . . . . . . . . . . . . . . .

1.2.5 MSP-EVK430x330 Target Connectors 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.6 The LCD 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.7 Schematic for the MSP-STK/EVK430x320 1–10. . . . . . . . . . . . . . . . . . . . . . . . .

1.2.8 Schematic for the MSP-EVK430x330 1–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.9 Starting the STK Demo Program 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.10 Executing a Program with the STK 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.11 How to Use Breakpoints 1–22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2.12 Accessing the Port on the MSP430x320 STK/EVK 1–23. . . . . . . . . . . . . . . . . .

1.2.13 How to Use an Interrupt Routine 1–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Loading a Program Into the EPROM Via the Terminal 1–25. . . . . . . . . . . . . . . . . . . . . .

2 Monitor Commands 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Syntax Conventions 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Memory Organization 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Commands 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Monitor Restrictions 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Register R4 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 The Instruction CALL R4 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Peripheral Hardware/Registers 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 RAM Locations for the Monitor 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.5 Writing Data Into the EPROM 3–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Treatment of Interrupts 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Use of Interrupts in the Monitor Environment 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Half Duplex Monitor Software UART 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 Transmission Parameters of the Software UART 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . .

5.2 Identification of Bit Pattern AA55h 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.3 Special Treatment of <ESC> in the Software UART 5–4. . . . . . . . . . . . . . . . . . . . . . . .

5.4 Transmitting One Character 5–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.5 Transmitting a String 5–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.6 Receiving a Character 5–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Using Interrupt Vectors in the EPROM 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1 The Identification Bit Pattern After a Reset 6–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iii

7 Memory Configurations for MSP430 Devices 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A Difference Between STK and EVK A–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

List of Illustrations

Figure Title Page

1–1 MSP-STK430 Program Group 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2 MSP/EVK430 Program Group 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–3 Terminal Screen 1–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–4 Programming the Device 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–5 MSP-STK/EVK430x320 Target Connectors 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–6 MSP-EVK430x330 Target Connectors 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–7 Supplied LCD Mechanical Data 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–8 LCD Segment Digits 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–9 LUXMETER Demo Program 1–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–10 Properties 1–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–11 Getting Started Demo Program 1–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–12 ASM430 Assembler Window 1–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–13 gs_stk1.asm Window Display 1–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–14 gs_stk1.asm 1–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–15 Terminal Window 1–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–16 Terminal Transfer 1–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–17 HyperTerminal Display 1–20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–18 Terminal | execute gs_stk1.txt 1–21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–19 Terminal Breakpoint 1–23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–20 Basic Timer Interrupt Routine 1–24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–21 Terminal | Interrupt 1–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–22 Programming Voltage and Jumper Location 1–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–23 EPROM LCD and Interrupt Routine 1–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–24 HyperTerminal Window 1–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–25 Transfers \ Send Text File 1–28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–26 Send Text File Dialog Box 1–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–27 Burn Failed Message 1–30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 Memory Organization 2–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Help Command 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Byte, Word Commands 2–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 Initializing the Terminal Program Command 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–5 User Reset Command 2–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–6 Register Command 2–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–7 Register Specified Command 2–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–8 Modify One Register 2–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–9 Modify Additional Registers 2–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–10 Revise Memory Modification 2–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–11 Memory Byte, Word Command 2–11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–12 Memory Modification 2–12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–13 Revised Memory Modification 2–13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iv

2–14 Transfer Data Command 2–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–15 EPROM Erase Check Command 2–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–16 Location of a Breakpoint Command 2–16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–17 Set a Breakpoint Command 2–17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–18 Clearing a Breakpoint Command 2–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–19 Clearing a Breakpoint Location 2–18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–20 Starting the Application Command 2–19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 CALL R4 Instruction Code 3–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–2 RAM Area 272h to 3FEh 3–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–3 RAM Area 200h to 3FFh for the MSP430x32x Family 3–4. . . . . . . . . . . . . . . . . . . . . . . . . . .

3–4 Temporary Burn Routine in the MSP430x32x RAM Area 3–5. . . . . . . . . . . . . . . . . . . . . . . .

4–1 Monitor Interrupts for the MSP430x32x Family 4–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–2 P0.0 Interrupt Example 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–1 Identification of Bit Pattern AA55h for the MSP430X32x Family 5–2. . . . . . . . . . . . . . . . . .

5–2 Special Treatment of ESC 5–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–3 Transmitting the s Character 5–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6–1 Identifying AA55h After Reset 6–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7–1 Memory Map of the STK/EVK 7–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7–2 Memory Map of the STK/EVK430X32x 7–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7–3 Memory Map of the STK/EVK430X33x 7–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

List of Tables

Table Title Page

1–1 LCD Connector 1–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–1 Peripheral Registers and Bits 3–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1 Type of Interrupt 4–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–2 Interrupt Vectors for the MSP430x32x Family 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–3 Interrupt Vectors for the MSP430x33x Family 4–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–1 Function/Vector 5–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

v

vi

1 Getting Started

This chapter provides installation and programming instructions for the starter Kit MSP-STK430x320, and
the evaluation Kits MSP-EVK430x320 and MSP-EVK430x320.

NOTE:

This manual covers both the MSP-STK430x320 and MSP-EVK430x320 kits. The
actual icons and/or windows on the computer screen may differ from those shown
in the book due to software version upgrades.

In this documentation, the term STK/EVK is used interchangeably to represent both kits. The programs used
in this manual are provided in the installation directory ..\stk\examples, or in ..\evk\examples. These
programs demonstrate the user-friendly environment of the MSP430 starter and evaluation kits.

The main difference between the MSP-EVK430x320 and the MSP-EVK430x330, besides the peripheral
blocks, is the memory map. The memory map is described in chapter 2 under Memory Organization.

1.1 Installing the Software

Exit all MS-Windows programs prior to loading this software.
The setup program installs all necessary files for running programs on the STK/EVK. The setup program

adds the appropriate program group and icons to the Windows program manager.
To install the software:

1. Insert MSP430-STK/EVK disk 1 in the floppy drive and run setup.exe.

2. In the Select Components window, choose the applications to load. The Starter Kit and
Simulation Environment button are the default. Make a choice and select Next.

3. Choose the desired COM port for the hardware connection. The default is set to COM port 2.
Select the port to be used, then select Next.

4. Read the licensing agreement and answer the question at the bottom of the screen. If YES is
selected to the licensing agreement, a prompt to close all other applications running in Windows
will appear.

5. The setup.exe program automatically creates and loads the MSP430-STK/EVK software to the
recommended directory (C:\ADT430), unless otherwise indicated. Choose the directory and
select Next.

6. Insert Disk 2 when prompted. Select OK when disk 2 is in the floppy drive.

7. Setup.exe places MSP430 icons in the ADT430 program folder, unless otherwise indicated.
Select Next.

8. Setup is complete. Please take a moment to fill out and return the registration card to ensure
receiving further software updates.

The ADT430 program folder should contain the following icons: Simulation Environment, Read me SIM,
Help SIM, ASM430 Assembler, Sensor Demo, and UnInstall the STK430 and EVK430 Terminals.

MS-Windows is a trademark of Microsoft Corp.

1–1

Figure 1–1. MSP-STK430 Program Group

Figure 1–2. MSP/EVK430 Program Group

NOTE: EVK/STK430 Terminal icon

Before clicking the EVK/STK430 Terminal icon, ensure the standard Windows Applications
Terminal and Notepad are installed in the Windows directory. The Windows terminal emulator
is configured to use serial port COM2 by default.

1.2 Hardware Installation

The STK/EVK kit hardware includes the STK/EVK-PCB and one 9-pin cable for connection to the PCs serial
communication port. The EVK also contains the PRG430 along with the necessary cables.

1.2.1 The STK/EVK-PCB Operating Conditions

Temperature range 10°C – 45°C
Humidity 40% – 70%
Current consumption

(Approximate V alues)

Operating voltage

≈0.7 mA at 3 V, 25°C, no connection to serial port
≈1 mA at 5 V, 25°C, no connection to serial port
≈5 mA at 3 V, 25°C, serial port connected
≈5.5 mA at 5 V, 25°C, serial port connected

Note: The current consumption is measured without any additional external

connections.
3 V or 5 V
Note: The operating voltage is selectable as 3 V or 5 V on the STK/EVK-PCB

by making the appropriate connections (see Figure 1–5 or 1–6,

depending on the system you have).

1–2

1.2.2 How to Install the Hardware

This section targets three main parts: the setup of the serial interface, the programming adapter, and the
power supply.

LCD and UVEPROM

The EVK is supplied with the LCD and a UVEPROM, separate from the EVK PCB. Install the EPROM and
LCD into the EVK PCB before proceeding. Refer to the STK/EVK target connectors section for the correct
LCD orientation. The STK has a one-time programmable (OTP) device mounted on the PCB.

Serial Communication

Connect the STK/EVK-PCB to the serial communications port of the PC using the 9-pin cable that is
supplied. Use the Settings/Communications. . .command to set the communication port to which the cable
is connected. The default selection is COM2.

The HyperTerminal (which uses the Terminal icon) is used to communicate to the STK/EVK MSP430 chip
via a Monitor Program that has already been downloaded into the EPROM of the chip. The HyperT erminal
settings used are: data bits—7; parity—even; stop bits—1; flow control—none.

Voltage Sources

The following four sources supply the voltage for the STK/EVK-PCB:

1. PC serial interface

Typically , the serial interface of the PC supplies the STK/EVK-PCB voltage using the 9-pin cable.
The user must determine if the serial interface can meet the electrical requirements of the
STK/EVK PCB. Some PC manufacturers do not source enough current and voltage from the
serial port to power the STK/EVK devices. If this is the case, a 9-volt battery can be connected in
parallel to the serial port.

2. 3.6 V lithium battery

A battery can be assembled onto the STK/EVK that supplies the STK/EVK-PCB with power.

3. Programming Adapter

The Programming Adapter’s power supply is stabilized to 5 V (this can only be used on the EVK).

4. Target system

The power supply from a target system can be connected to the STK/EVK-PCB. A supply voltage
of 3 V to 5 V can be used.

CAUTION: Different Power Supplies
If there is more than one power supply connected, the STK/EVK is supplied
with the higher voltage, provided the data sheet supply voltage ranges are
not exceeded.

If the HyperT erminal program is running on the PC, the serial communication cable has been installed, the
proper com port is selected, and the proper voltage is supplied, the screen will look like Figure 1–3.

1–3

MSP–STK430A320

>_

Figure 1–3. Terminal Screen

A help message is displayed on the screen automatically if the Monitor message MSP-STK430x320 is not
received by the STK/EVK control software, where x is the current revision letter.

Reset Button

NOTE: Pins for the STK Demo Program

Some pins of the MSP430 device will be used for the sensor demo program (only available on
the STK):

• A5 (connected to the sensor)

• Seg0. . .Seg13 (connected to the LCD Display)

• Com1. . .Com4 (connected to the LCD Display)

• R03. . .R33 (connected to the LCD R-Ladder)

• P0.0 (connected to the Trigger button)

• The string MSP-STK430x320 should appear in the HyperTerminal window (white background

area of the STKW95 HyperTerminal window). In addition, the LCD display on the evaluation
board (EVK or STK) should display MSP430.

• If both do not appear, simply press the reset button on the evaluation board (identified with an
RES etched next to it) one time.

NOTE:

The MSP430 evaluation board requires very low supply voltages due to its ultra-low
power consumption characteristics. In this case, the RS232 interface, or a 3.6 V
lithium battery (if installed) provides the supply voltage for the STK/EVK.

Due to PC com port differences, it may be necessary to jumper the board down to
3 V or supply an external battery . To jumper the board, refer to the diagram in the
STK/EVK T arget Connectors section, and place one jumper across the Vcc holes,
and another across the Vcc/LCD holes where the default for both of these is open.

HyperTerminal is a trademark of Hilgraeve.

1–4

Changing the RS232 interface to another COM port (other than COM2) of a personal computer, requires
a change to the COM port assignment in the current version of the terminal emulator.

1.2.3 Programming the Monitor Software Into an Erased EPROM (EVK Only)

The following steps are recommended to program the Monitor into an EPROM after it has been erased:

1. Connect the EVK-PCB to the programming adapter.

2. Connect the programming adapter to the PC.

3. Apply the power supply to the programming adapter (not included in the kit).

4. Start the Program Device software and:

– select the file mon_140.txt in the STK directory
– select with Verify
– select EPROM device
– select the correct parallel port where the adapter is connected
– click on the Program button.

For detailed information see the MSP430 Family Programming Adapter Manual.

Figure 1–4 shows the pop-up that will appear when programming the Monitor software into an erased
EPROM EVK.

Figure 1–4. Programming the Device

1–5

1.2.4 MSP-STK/EVK430x320 Target Connectors

External Supply 3–5V dc
Only Required If Stand
Alone Operation

Pin 1 A4
Pin 2 A5
Pin 3 A2
Pin 4 A3
Pin 5 SVCC
Pin 6 REXT
Pin 7 A0
Pin 8 A1

V

CC

3 V
5 V

V

CC
5 V
5 V
3 V

VPP-Input
Apply 12-20 V dc If
Programming Using Serial
Port

LCD
3 V
5 V

3 V

Default

Close

Open

Open
Close
Close

Digital Signals:

Pin 1 XIN Pin 9 NC Pin 17 PO.0
Pin 2 XOUT Pin 10 CI Pin 18 PO.1
Pin 3 XBUF Pin 11 TP.0 Pin 19 PO.2
Pin 4 RST/NMI Pin 12 TP.1 Pin 20 PO.3
Pin 5 TCK Pin 13 TP.2 Pin 21 PO.4
Pin 6 TMS Pin 14 TP.3 Pin 22 PO.5
Pin 7 TDI Pin 15 TP.4 Pin 23 PO.6
Pin 8 TDO Pin 16 TP.5 Pin 24 PO.7

VPP Fuse F250 mA

Connector To Programming
Adapter MSP-PRG430x
(Only EVK)

1–6

LCD Signals:

Pin 1 R33 Pin 11 SEG6 Pin 21 SEG16
Pin 2 R23 Pin 12 SEG7 Pin 22 SEG17
Pin 3 R13 Pin 13 SEG8 Pin 23 SEG18
Pin 4 R03 Pin 14 SEG9 Pin 24 SEG19

Pin 5 SEG0 Pin 15 SEG10 Pin 25 SEG20
Pin 6 SEG1 Pin 16 SEG11 Pin 26 COM0
Pin 7 SEG2 Pin 17 SEG12 Pin 27 COM1
Pin 8 SEG3 Pin 18 SEG13 Pin 28 COM2
Pin 9 SEG4 Pin 19 SEG14 Pin 29 COM3
Pin 10 SEG5 Pin 20 SEG15 Pin 30 NC

Figure 1–5. MSP-STK/EVK430x320 Target Connectors

LCD (Only STK)

1.2.5 MSP-EVK430x330 Target Connectors

Pin z = Power
g = Ground

Figure 1–6. MSP-EVK430x330 Target Connectors

1–7

1.2.6 The LCD

Figure 1–7 shows the segment type LCD supplied with the STK/EVK.

40.00 ± 0.25

± 0.15 2.90 ± 0.15

2.90

0.90

120

VEWING AREA

Digit 7 6543 210

2.00 8.30 4.10

1.80x 19 = 34.20

± 0.05 0.90

± 0.10

Figure 1–7. Supplied LCD Mechanical Data

6.00 4.85

±

14.40 0.25

1–8

The LCD is connected to the STK/EVK as shown in Table 1–1.

T able 1–1. LCD Connector

PIN NO. COM1 COM2 COM3 COM4

1 – – COM3 –
2 – – – COM4
3 – COM2 – –
4 COM1 – – –
5 – – – –
6 6C 6F 6H 6E
7 6A 6B 6D 6G
8 5C 5F 5H 5E

9 5A 5B 5D 5G
10 4C 4F 4H 4E
11 4A 4B 4D 4G
12 3C 3F 3H 3E
13 3A 3B 3D 3G
14 2C 2F 2H 2E
15 2A 2B 2D 2G
16 1C 1F 1H 1E
17 1A 1B 1D 1G
18 0C 0F 0H 0E
19 0A 0B 0D 0G
20 COM1 – – –

A

E

C

H

FB

G

EC

D
H

Digit 6–0Digit 7

Figure 1–8. LCD Segment Digits

1–9

1.2.7 Schematic for the MSP-STK/EVK430x320

SEG1857SEG1756SEG1655SEG15

60 SEG20

59 SEG19

58

54 SEG14

53 SEG13

52 SEG12

51 SEG11

50 SEG10

49 SEG9

48 SEG8

47 SEG7

46 SEG6

45 SEG5

TP.1

32 kHx

33

TP.2

x1

32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17

TP.3

TP.4

TP.5

TAST1

GND

Not Assembled On EVM

44 SEG4

43
42

SEG3
SEG2

41

SEG1

40

SEG0

39

R03

38

R13

37

R23

36

R33

35

PO.7

34

PO.6

33

PO.5

32

PO.4

31

PO.3

30
29

PO.2
PO.1

28
27

PQ.0

1M

R23

3

4

J4

1

2

GND

61
62

COM0
COM1

63
COM2
COM3
TDO
TDI
TMS
TCK
RST/NMI
XBUF
A0
A1
AVSS
DVSS

AVCC

64

65

66

67

68

1

2

3

4

5

6

7

8

9

484746454443424140393837363534

49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

1

2345678

1011121314151617181920212223242526

DVCC

A2A3A4

REXT

SVCC

2.7 k
R22

CA

DVCC/AVCC

U5

NC

3

LM283SLP–2.5

2

1

Not Assembled On EVM

r9l232

D5

GND

AK
LL103A

D4

U3

MSP430P325IPM

A5

XIN

XOUT

00HM

R24

VCC_MSP

XOUT

STK 64 QFP CHIP

EVK 68PLCC SOCK

9

10111213141516

CI

TP.0

6
1

22 pF

C7

RST/NMI

GND

Ω

0

Open

EYES

RI6

5 V

3 V

1.8 M
=

=

CC

CC

SOLDER

RI9

V

V

820 k

RI8

820 k

RI7

820 k

COM1S0S1S2S3S4S5S6S7S8S9

Not Assembled On EVK

20191817161514

678

9

SEG0

SEG1

J2

1

234

SEG2

5

D11

LL503A

AK

I

T2

E

C

B

22 K
R14

T3

C

E

B

R13

100 k

8C850

SEG3

SEG4

+

22µ F 16 V

C7

AK

LL4348

D9

SEG5

13

SEG6

987654321

121110

SEG7

SEG8

SEG9

SEG10

GND

S10

S11

S12

S13

S14

COM1

COM2

COM3

COM4

SEG11

SEG12

SEG13

SEG14

COM0

COM1

COM3

COM2

R15

2.7 k

AK

LL40348

D11

220 k
R20

B

E

8C850

C

T4

1–10

C7

10 DNF

RESET

+ –

GND

TAST1

AK

LL103A

D2

AK

LL103A

D1

246

8

10

9

= 3 V 0 Ω

= 5 V Open

SOLDER EYES

CC

CC

V

V

14

11 12

13

GND

8

OUT1

TPS720100

S/FPQGND

123

560 K

R5

510 KR6150 K

R4

+

–

C4

100 NF

C3

10µ F 30 V

J1 Not Assembled onSTK

OUT2

120 K

100 k

R11

T1

C

E

B

8C850

100 NF

C6

+

–

10µ F 30 V

567

IN3

IN2

U1

EN_

4

C5

AK

LL103A

D6

R7

270 K

GND

R12

AK

AK

LL4348

33 k

R10

LL4348

D8

D7

R9

100 k

GND

100 k

R6

+

–

47µ 36 V

C8

567

8

IN3

TL751L1200

FD 25 A

OUT1

OUT2

S/FPQGND

234

1

IN2

EN_

AK

LL383A

D14

U4

GND

10 k

R21

V_EIN

BU1

D13

D12

LL303A

LL434B

F1

K
A

K
A

GND

4.7 M

J1

1

357

K

D3

LL103A

A

1 k

R23

100 NF

C1

J3

C9

47µ F 10 V

R3

100 k

R1

3

4

1

2

VCCEXT

1.2.8 Schematic for the MSP-EVK430x330

P1.3

P1.4

P1.5

C9

390 nF

39 nF

X1

32 KHz

TDI

11

13

TCK

GND

1OO kΩ

R8

876

OUT1

OUT2

SFPGGND

TPS7201QD

1

234

150 kΩ

R6

P1.6

GND

XIN

GND

IN1

S0S1S2S3S4S5S6S7S8S9S10

P1.7

5

IN2

EN

NC2
80

81

S23

82

S24

83

S25

84

S26

85

S27

86

S28

87

S29

88

R03

89

R13

90

R23

91

VCC

92

TDD

93

TDI

94

TMS

95

TCK

96

RST

97

XBUF

98

XOUT

99

XIN

100

GND

123456789

VCC

VCC

S19

S20

S21

S22

CI

TP0.0

TP0.1

TP0.2

R23

1.5 kΩ

Not Assembled

R23

820 kΩ

R22

RST

4.7 M

R3

D3

LL103A

R7

1 kΩ

100 kΩ

R1

2

Test3

Reset

1

C2

100 N

–

+

10 V

C1

47 µF

LL103A

D1

S11

S12

S13

S14

S15

S16

S17

S18

101112131415161718192021222324252627282930

P0.0

P0.1

P0.2

P0.3

P0.4

P0.5

P0.6

P0.7

P1.0

P1.1

R27

NTC

GND

XOUT

VCC_MSP

2468101214

J1

13579

TDO

Solder Eyes

10 V

+

C610 µF

C6100 N

C10

TDI

R4

R5

–

P1.2

XOUT

TMS

560 kΩ

510 kΩ

TP0.3

TP0.4

R24

R13

820 kΩ

R21

C4

100 N

C3

100 N

S1

VCC EXIT

10 kΩ

TP0.5

R25

100 kΩ

Solder Eyes

R03

820 kΩ

R20

LL103A

D4

GND

VCC = 3 V, 0Ω

LL103A

D2

R26

NTC

VCC = 5 V, Open
VCC = 3 V, 0Ω

1.8 M
R19

VCC = 5 V, Open

COM1

COM0

P2.0

D15

COM2

P2.1

P2.2

LL103A

R7

GND

COM3

VCC

GND

J2

12345

D14

R15

22 kΩ

P0.2

P0.1

C8

+
C7

270 kΩ

P4.7
5152535455565758596061626364656667686970717273747576777879

NC1

678

LL103A

E

BC860

BC850

E

B

100 N

–

10 µF

9.1 V

D5

P4.6

50

P4.5

49

P4.4

48

P4.3

47

P4.2

46

P4.1

45

P4.0

44

P3.7

43

P3.6

42

P3.5

41

P3.4

40

P3.3

39

P3.2

38

P3.1

37

P3.0

36

P2.7

35

P2.6

34

P2.5

33

P2.4

32

P2.3

31

COM1S0S1S2S3S4S5S6S7S8S9

Not Assembled

2019181716151413121110

9

S0S1S2S3S4S5S6S7S8

T2

C

BC850

B

R16

T1

Z–DIODE

100 kΩ

C

GND

C

B

R13

820 kΩ

R12

820 kΩ

R11

Not Assembled

T3

Buzzer

D10

100 kΩ

LL103A

D12

D11

F1

0Ω

R28

LL103A

E

100 kΩ

R14

D6

TL751L12QD

LL4148

F0.25 A

Not Assembled

C13

22 µF

–

+

LL4148

D8

LL4148

123

C1

C2

OUT

INC4C3

8

765

D7

LCD

T21B010

S10

S11

S12

987654321

S9

S11

S10

S12

S13

R18

2.7 kΩ

GND

D5

R16

B

E

BC850

C

T4

LL4148

D7

100 kΩ

R10

C12

33 µF

4

NC

EN

100 kΩ

R9

LL103A

C12

100 N

VCC

S13

S14

S14

LL4148

220 kΩ

COM1

COM0

COM1

GND

BU1

COM2

COM3

COM3

GND

GND

Buchse

COM4

COM2

1–11

1.2.9 Starting the STK Demo Program

In the HyperT erminal program, type a d to start the demo program. If the HyperT erminal program has been
closed, double click on the Sensor Demo icon to start the demo program.

LUXMETER Demo Program:

The STK Monitor includes a demo program that shows a metering application. The application hardware
consists of the light sensor, a trigger button, and a voltage reference for the analog-to-digital converter.

When the program starts, the screen displays demo and the measured light values are shown on the LCD
display (measured in irradiance). The values are updated every 5 seconds. The A on the left side of the
LCD indicates that the shown value is less than one second old. Any keystroke interrupts the demo program
and switches back to the Monitor/HyperT erminal program. If the STK is disconnected with the demo running,
the program will run until a mounted battery is discharged. To correctly exit the program push the <ESC>
key.

Voltage Reference

Trigger Button Light Sensor

Figure 1–9. LUXMETER Demo Program

1.2.10 Executing a Program with the STK

To execute a program, write a test program or use the gs_stk1.asm file, which is located in the
C:\ADT430\STK\EXAMPLES directory. Figure 1–11 is the Getting Started demo program.

NOTE: Programming Hint

During development, a program should reside in the free RAM area (240h-3FFh for the
MSP430x320, and 272h–50Ch for the MSP430x330) making program modification during
debug phase possible. Any code written to the device’s EPROM area on the STK cannot be
erased. The stack pointer for the MSP430x33x device resides at 005DEh.

1–12

How to use the command line parameters of the assembler:

The default command line parameters of the assembler (asm430.exe) are -z and -I. These
parameters are set in the Properties of the Assembler icon after installation. For further
information on command line parameters see the Assembly Language Tools User’s Guide .

T o change the parameters, select the ASM430 Assembler icon with one left mouse click. Click on
the file menu in the Windows Program Manager and select the Properties command. Select the
shortcut tab. Depending on the version of Windows being used, the screen will show the following
dialog on the screen:

Command

Figure 1–10. Properties

NOTE: File | Properties...

If the installation is not changed, the parameters -z and -I will be added to the target’s statement.
If the Start in: properties are adjusted to the source code directory, the path of the source file
should not be entered.

1–13

;****************************************************************************
;Getting Started 1 Demo Program (C) TEXAS INSTRUMENTS on 2/96

;****************************************************************************
SIM .set 0 ; 1 = Simulator

; 0 = STK/EVK
RAM_orig .set 00240h ; Free Memory startadress
SP_orig .set 003DEh ; stackpointer

;––– Control register definitions
IE1 .equ 0h

IE2 .equ 01h
IFG1 .equ 02h
IFG2 .equ 03h
ME1 .equ 04h
ME2 .equ 05h

WDTCTL .equ 0120h
WDTHold .equ 80h
WDT_wrkey .equ 05A00h

GIE .equ 08h
;****************************************************************************

;Reset : Initialize processor
;****************************************************************************

.sect “MAIN” ,RAM_orig
RESET
MOV #SP_orig,SP ; initialize stackpointer
MOV #(WDTHold+WDT_wrkey), &WDTCL ; Stop Watchdog Timer

;––– Clear Special Function Registers

MOV.B #08h, IE1 ; ! Monitor !
CLR.B IE2
CLR.B IFG1
CLR.B IFG2

JMP $ ; Endless Loop

File gs_stk1.asm

1–14

Figure 1–11. Getting Started Demo Program

Use the assembler icon in the ADT430 Program Folder to assemble the gs_stk1.asm file, which is located
in the C:\ADT430\STK\EXAMPLES directory , and is shown in Figure 1–11. Ensure that the Start in: property
of the assemble icon is set to the source directory (C:\ADT430\STK\EXAMPLES). Click on the ASM430
Assembler icon.

The following screen will appear (the version number, date, and copyright date may dif fer from that shown
below):

Figure 1–12. ASM430 Assembler Window

1–15

Enter the source name gs_stk1 and press ENTER. This will cause the assembler to assemble gs_stk1.asm
into gs_stk1.txt. The following display will appear:

Source File

Figure 1–13. gs_stk1.asm Window Display

The assembler output file is named gs_stk1.txt. This file is created only if the assembler is invoked with the
option -z. To verify that the gs_stk1.txt file was created, check the ADT430\STK\EXAMPLES directory.

An additional listing of gs_stk1.lst is created when the option -l is used. To review the gs_stk.lst output,
double-click on the file name and view using an appropriate viewer. Figure 1–14 is a listing of gs_stk1.asm:

1–16

MSP430 Macro Assembler Version 1.08 [09/96] Tue Jun 30 07:20:38 1998
Copyright (C) 1995, 1996 Texas Instruments Incorporated

c:\adt430\stk\examples\gs_stk1.asm Page 1

1;***************************************************************************
2;Getting Started 1 Demo Program (C) TEXAS INSTRUMENTS on 2/96

3;***************************************************************************
4
5;*** Set this variable to ’1’ for the use on the Simulator***
6 00 SIM .set 0 ; 1 = Simulator
7 ; 0 = STK/EVK
8 0240 RAM_orig .set 00240h ; Free Memory startadress
9 03de SP_orig .set 003DEh ; stackpointer
10
11 ;––– Control register definitions
12
13 00 IE1 .equ 0h
14 01 IE2 .equ 01h
15 02 IFG1 .equ 02h
16 03 IFG2 .equ 03h
17 04 ME1 .equ 04h
18 05 ME2 .equ 05h
19
20 0120 WDTCTL .equ 0120h
21 80 WDTHold .equ 80h
22 5a00 WDT_wrkey .equ 05A00h
23
24 08 GIE .equ 08h
25
26;**************************************************************************
27; ; Reset : Initialize processor

28;**************************************************************************
29 0240 .sect “MAIN” ,RAM_orig
30 0240 RESET
31 0240 403103de MOV #SP_orig,SP ; initialize stackpointer
32 0244 40b25a800120 MOV # (WDTHold+WDT_wrkey) , &WDTCTL

; Stop Watchdog Timer
33
34 ;––– Clear Special Function Registers
35 024a 42f20000 MOV.B #08h,IE1 ; ! Monitor !
36 024e 43c20001 CLR.B IE2
37 0252 43c20002 CLR.B IFG1
38 0256 43c20003 CLR.B IFG2
39
40 025a +3fff JMP $ ; Endless Loop

No Errors, No Warnings
gs_stk1.lst

Figure 1–14. gs_stk1.asm

1–17

Next, the object file gs_stk1.txt will be downloaded to RAM of the MSP430-STK/EVK.
The PC downloads the object file gs_stk1.txt to RAM of the MSP430_STK/EVK. The PC uses the

HyperTerminal to communicate with the Monitor Program in the EVK/STK EPROM or ROM.
Windows95 (NT) provides a terminal emulator icon under Start/Programs/Accessories.

Double-clicking with the mouse on the STK430 terminal icon also starts the HyperTerminal. The STK430
icon is located under the ADT430 program group.

Serial communication is set up for the STK/EVK as needed. When the serial interface of the STK/EVK is
connected to the COM2 port of the PC, the LCD display on the STK/EVK will show MSP430, and the Monitor
in the MSP430 device will send the following string:

MSP–STK430A320

>_

1–18

Figure 1–15. Terminal Window

Open the pulldown menu Transfer in the HyperTerminal to load the program using the RS232 into the
STK/EVK, as shown in Figure 1–16. Select the Send Text File menu item.

NOTE:

Transfer
Send Text File

MSP–STK430A320

>_

Receive text file...
V

iew Text File...

Send Binary File...
Receive Binary F

Pause

Resume
Stop

Figure 1–16. Terminal Transfer

NOTE: The help menu can be displayed by typing an h.

ile...

1–19

Select the assembler output file gs_stk1.txt in the examples directory from the Send T ext File . . dialog box.
Figure 1–17 shows the HyperT erminal screen displaying the following data after loading gs_stk1.txt into the
STK/EVK.

Init

MSP–STK430A320
>@0240
31 40 DE 03 B2 40 80 5A 20 01 F2 42 00 00 C2 43
01 00 C2 43 02 00 C2 43 03 00 FF 3F
q
>downloaded _PC_ _SP_ _SR_
reg 0000 4204 03de 0008 0000 f48c cd9f 0069 000e
reg 0008 : 0c62 4071 0000 ffd0 2051 0e10 08ac f84e

Figure 1–17. HyperTerminal Display

1–20

In the HyperT erminal , type r0 <ENTER> to modify the program counter of the user program. The program
displays the current content of r0. Next type 0240 <ENTER> to set the start address as defined in
gs_stk1.asm. Exit the modify register mode by pressing the <ESC> key.

Each time the SP ACE bar is pressed, the program executes one single step and the program displays the
registers contents. Typing a g followed by <ENTER> causes the program to continue from the current
address stored in the program counter. Pressing the <ESC> key stops the program.

NOTE: Single Step

The single step command should only be executed if the program counter points to an
instruction in the RAM. Otherwise this command acts like a go command.

>@0240
31 40 DE 03 B2 40 80 5A 20 01 F2 42 00 00 C2 43
01 00 C2 43 02 00 C2 43 03 00 FF 3F
q
>downloaded _PC_ _SP_ _SR_
reg 0000 4204 03de 0008 0000 f48c cd85 2ed4 10de
reg 0008 0c42 4068 0000 ffd0 2051 0e10 08ac b8
>r0
=reg 0000 4204 0240
=reg 0001 03de !
reg 000: 0008
>step
>executed _PC_ _SP_ _SR_
reg 0000 0244 03de 0008 0000 f48c cd85 2ed4 10de
reg 0008 0c42 4068 0000 ffd0 2051 0e10 08ac b842
>go..
>user break _PC_ _SP_ _SR_
reg 0000 025a 03de 0008 0000 f48c cd85 2ed4 10de
reg 0008 0c42 4068 0000 ffd0 2051 0e10 08ac b842
>

Figure 1–18. Terminal | execute gs_stk1.txt

Another way to start this program is to write the start address (in this instance 0240h) into memory location
03FEh. Each time the u user command is executed or the reset button is pressed, the start address (in this
instance 0240h) is written to the user program counter. Switch to the word mode by entering a w, and then
enter m3fe and <ENTER>. Now the start address can be entered (in this instance 0240), and press
<ENTER> and <ESC> to exit. Pressing u and then g starts the program.

NOTE: Use of the examples in MSP430 Simulation Environment

If the examples are used in the MSP430 Simulation Environment, the SIM constant (located
at the top of the assembler code) must be set to 1.

1–21

1.2.11 How to Use Breakpoints

Continue the Getting Started exercise by assembling and downloading the file gs_stk2.asm in the examples
directory as described previously.

This program includes a section for the reset vector, so the program counter is initialized after the download
and each time a user performs a reset.

;****************************************************************************
; Interrupt vectors

;****************************************************************************

.sect “Int_Vect”, USER_END-1
.word RESET ; POR, ext. Reset, Watchdog

.end

1. Start the program by typing g <ENTER>. The display indicates 0, then 1 on the LCD.

2. Press the <ESC> key to stop the program.

3. Type u <ENTER> to execute a user reset.

4. Set the breakpoint by typing s, and then 0264 (address) <ENTER>. This breakpoint stops the
program prior to changing the display.

5. Type s <ENTER> to stop the program. It stops prior to changing the display. Step through the
program by pressing the space bar showing how the display changes.

6. Clear the breakpoint by typing c, and then 0264 (address) <ENTER>.

Figure 1–19 shows these commands as they appear on the display .

1–22

Enter The g-command to start the program

Press <ESC> to Interrupt the program

Enter the u-command to execute a user reset

Enter the s-command to set a breakpoint

Enter the address of the breakpoint

>downloaded _PC_ _SP_ _SR_
reg 000: 0240 03de 0008 0000 f48c 0010 0000 15de
reg 0008 0e62 404d 0000 ffd0 2153 0e14 28ad feff
>go . .
>user break _PC_ _SP_ _SR_
reg 0000 0260 03de 0009 0000 f48c 0000 0000 15de
reg 0008 0e62 404d 0000 ffd0 2153 0e14 28ad 34af
>user reset _PC_ _SP_ _SR_
reg 0000 0240 03de 0008 0000 f48c 0000 0000 15de
reg 0008 0e62 404d 0000 ffd0 2153 0e14 28ad 34af
>set Bkpt 0000 0000 0264
>
>go_
>BP halted _PC_ _SP_ _SR_
reg 0000 0264 03de 000b 0000 f48c 0000 0000 15de
reg 0008 0e62 404d 0000 ffd0 2153 0e14 28ad 0000
>step
>>executed _PC_ _SP_ _SR_
reg 0000 026a 03de 0008 0000 f48c 0000 0000 15de
reg 0008 0e62 404d 0000 ffd0 2153 0e14 28ad 0000

>

Enter the g-command to start the program

Automatic stop on breakpoint

Press the SPACE key to execute a single step

Figure 1–19. Terminal Breakpoint

1.2.12 Accessing the Port on the MSP430x320 STK/EVK

Assemble and download the file gs_stk3.asm in the examples directory, as described previously.
Press the trigger button on the demo to start the program. Press the trigger button to toggle the display

between 0 and 1.
The following instructions are necessary:

;––– Init Port

;––– Test of Port

BIC.B #01h,P0DIR ; Set P0.0 as input
BIC.B #01h,POIE ; Disable P0.0 interrupt

1–23

$ML1 BIT.B #01h,P0IN ; Test P0.0

JNZ $ML1 ; Do nothing if P0.0 low

1.2.13 How to Use an Interrupt Routine

Assemble and download the file gs_stk4.asm in the examples directory, as described previously.

1. When an interrupt occurs, the program sends the contents of the program counter and status
register to the stack.

2. Next, the program branches to the starting address of the interrupt routine.

3. The interrupt routine normally ends with the RETI instruction.

4. The RETI instruction loads the data, which was saved to the stack at the beginning of the interrupt
routine, to the status register and program counter.

5. The program continues from the point of interruption.

Using interrupt routines allows the MSP430 to use low power modes. Selecting a low power mode causes
the program to stop at the current position, and an activity that causes an interrupt automatically clears the
low power mode. The interrupt continues program execution at the starting address of the corresponding
interrupt routine. The RETI loads the saved program data to the status register and program counter.
Loading the status register and program counter clears out the low power mode bits, and the program
continues with the next instruction. Figure 1–20 is the Basic Timer Interrupt routine.

BIS #CPUOFF,SR ; set CPUoff Bit

;****************************************************************************
; Basic Timer Interrupt routine

;****************************************************************************
Int_BT ; Basic Timer 128 Hz (7.8 ms)

Int_BT_end

To use the interrupts, the interrupt vector table must be set up as follows:

;****************************************************************************
; Interrupt vectors

;****************************************************************************

DEC.B lcd_timer ; decrement SW lcd-timer
JNZ Int_BT_end ; !0 : no action
BIC #CPUOFF,0(SP) ; Clear CPUoff Bit
MOV.B #lcd+ival,lcd_timer ; = 0 : load again

RETI

.sect ”int_Vect”, USER_END-31
.word RESET ; no source
.word Int_BT ; Basic Timer
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; NMI, Osc. fault
.word RESET ; POR, ext. Reset, Watchdog
.end

Figure 1–20. Basic Timer Interrupt Routine

1–24

Set a breakpoint at address 025Eh, and single step through the program. A longer reaction time can be
expected for any step beyond address 025Eh. At this time, the CPU is off and waiting for the Basic Timer
interrupt.

NOTE: Only two breakpoints may be set at any one time.

>step
>executed _PC_ _SP_ _SR_
reg 0000 : 0268 03de 0008 0000 f48c 0000 6ed4 10df
reg 0008 : 0c62 409e 0000 ffd0 2051 0e14 28ac f84e
>step
>executed _PC_ _SP_ _SR_
reg 0000 : 026a 03de 0008 0000 f48c 0000 6ed4 10df
reg 0008 : 0c62 409e 0000 ffd0 2051 0e14 28ac f84e
>step
>executed _PC_ _SP_ _SR_
reg 0000 : 0270 03de 0008 0000 f48c 0000 6ed4 10df
reg 0008 : 0c62 409e 0000 ffd0 2051 0e14 28ac f84e
>step
>executed _PC_ _SP_ _SR_
reg 0000 : 025e 03de 0008 0000 f48c 0000 6ed4 10df
reg 0008 : 0c62 409e 0000 ffd0 2051 0e14 28ac f84e
>step
>executed _PC_ _SP_ _SR_
reg 0000 : 0262 03de 0008 0000 f48c 0000 6ed4 10df
reg 0008 : 0c62 409e 0000 ffd0 2051 0e14 28ac f84e
>

Figure 1–21. Terminal | Interrupt

1.3 Loading a Program Into the EPROM Via the Terminal

After debugging, the program is ready to load. The program is loaded to the EPROM for the EVK, or ROM
for the STK. The STK requires a programming voltage. The EVK requires a jumper between pins 13 and
14 of the programming connector. Figure 1–22 show the locations for the programming voltage and the
connector jumper.

1–25

VPP -Input
Apply If
programming via serial
port

VPP fuse F250 mA

Connects to programming
adapter MSP-PRG430x
(EVK only)

Jumper for programming the EPROM
of an EVK with the Monitor

Figure 1–22. Programming Voltage and Jumper Location

To load a program into the MSP430 EPROM/ROM using the HyperTerminal, the following points must be
considered:

• The Monitor code must already be programmed into the EPROM/ROM (only the EVK is supplied
with the code for the monitor program mon_x.txt).

• The STK/EVK 9-pin D-SUB-connector must be connected to the serial interface (the default is
COM2) of the PC.

• The supply voltages of the STK/EVK must be applied by connecting the STK/EVK to the serial
interface of the PC and by connecting the programming supply voltage.

NOTE: Programming the EVK using the Serial Port

Attach a jumper between PIN 13 and PIN 14 on the Programming Adapter connector (see
Hardware Installation in Chapter 9).

If the assembled file gs_stk5.asm is downloaded, the program routines for the LCD, and the interrupt routine
of the previous example will be written into the EPROM/ROM (see sections in the code).

1–26

;****************************************************************************
; Section in EPROM

;****************************************************************************

.sect “PrepLCD”, EPROM_orig
;––– Prepare LCD and Basic timer
PrepLCD MOV.B #–1h,LCDM ;LCD : Analog generator on Low

; impedance 4 Mux active
; all outputs are Seg

MOV.B #057h,BTCTL ; Basic Timer : SSEL=0 DIV=0 Reset=1

; ACLK
; 32768/256 = 128 Hz
; (7.8 ms debounce time)

; LCD frame frequency @ 4 Mux: 64 Hz
BIS.B #BTME,ME2 ; Enable basic timer module
BIC.B #040h,BTCTL ; Basic Timer reset disabled
BIS.B #BTIE,IE2 ; enable basic timer interrupt
MOV.B #lcd_ival,lcd_timer ; load SW lcd timer

CALL #show_cir ; clear LCD
EINT ; enable interrupts

;––– clear LCD

.sect “show_clr:”,EPROM_orig+50h

show_clr

MOV #15, r5 ; clear display memory

show_clrl

MOV.b #0, LCD1–1(r5)
DEC r5
JNz show_clr1
RET

;****************************************************************************
; Basic Timer Interrupt routine

;****************************************************************************

.sect “Int_BT” ,EPROM_orig+100h

Int_BT ; Basic Timer 128 Hz (7.8 ms)

DEC.B lcd_timer ; decrement SW lcd-timer
JNZ Int_BT_end ; !0 : no action
BIC #CPUOFF,0 (SP) ; Clear CPUoff Bit
MOV.B #lcd_ival,lcd_timer ; =0 : load again

Int_BT_end

RETI

Figure 1–23. EPROM LCD and Interrupt Routine

Now these routines can be used in any other program. This section does not have to be downloaded again,
even if the STK/EVK is disconnected from the power supply .

T o load a program using the HyperT erminal, double click the terminal icon in the MSP-STK/EVK430 program
group in the Windows Program Manager. The HyperTerminal window appears as follows in Figure 1–24.

1–27

MSP–STK430A320

>_

Figure 1–24. HyperTerminal Window

To load a program into the MSP430 using the HyperTerminal, activate the Transfers/Send Text File. . .
command as shown in Figure 1–25.

Transfer
Send Text File

MSP–STK430A320

>_

Receive text file...
V

iew Text File...

Send Binary File...
Receive Binary File...

Pause

Resume
Stop

Figure 1–25. Transfers \ Send Text File

Figure 1–26 shows the Send Text File dialog box.

1–28

Press Open to Send TXT FileChoose your Text File

Figure 1–26. Send Text File Dialog Box

Figure 1–27 represents a burn fail screen. If an error occurs during the programming of the EPROM, the
screen shows the message burn failed at XXXX. Where XXXX is the address where the programming cycle
failed the first time.

1–29

>@C000
F2 43 30 00 F2 40 57 00 40 00 F2 D0 80 00 05 00
F2 C0 40 00 40 00 F2 D0 80 00 01 00 F0 40 80 00
01 42 B0 12 50 C0 32 D2
@C050
35 40 0F 00 C5 43 30 00 15 83 FC 23 30 41
@C100
D0 83 1F 41 06 20 B1 C0 10 00 00 00 F0 40 80 00
11 41 00 13
@03E0
40 02 00 C1 40 02 40 02 40 02 40 02 40 02 40 02
40 02 40 02 40 02 40 02 40 02 40 02 40 02 40 02
q
>burn failed at c000
>downloaded _PC_ _SP_ _SR_
reg 0000 0240 03de 0008 0000 f48c c010 0000 0010
reg 0008 0c62 4098 0000 ffd0 2051 0e14 28ac f84e

>

Figure 1–27. Burn Failed Message

In the gs_stk6.asm example, in the examples directory, only the addresses of the routines in the EPROM
are labeled. This supports easy use of program sections in the EPROM.

;****************************************************************************
; Addresses in EPROM

;****************************************************************************
PrepLCD .equ EPROM_orig ; EPROM Address of PrepLCD

;––– clear LCD
show_clr .equ EPROM_orig+50h ; EPROM Address of show_clr

; Basic Timer Interrupt routine

Int_BT .equ EPROM_orig+100h ; Basic Timer 128 Hz (7.8 ms)

1–30

2 Monitor Commands

This chapter describes the syntax conventions and the available commands of the Monitor Program.

2.1 Syntax Conventions

• The numbers in brackets [ ] are optional.

• x is a hexadecimal address.

• n is the hexadecimal number of bytes to show.

• i is the hexadecimal register number.

• Only the r, m, and e commands expect <ENTER> or <ESC> commands.

• The <ESC> key provides a keyboard interrupt for all command inputs except m.

• The half-duplex UART prevents keyboard interrupts while entering a large number of bytes to

show the results of an action.

• The registers are named in hexadecimal format from R0 to RF.

• All addresses or memory/register contents must be entered in hexadecimal mode. Entering

zeros in the MSB is optional.

• Errors in address or memory/register contents in the terminal input must be corrected by
re-entering all four hexadecimal digits. The leading (MSB) zeros are optional.

• The Arrow, Insert, Delete, or Backspace keys can not be used to change an incorrect terminal
input.

2.2 Memory Organization

T o use some commands, it is necessary to know the memory locations and their functions (see Figure 2–1).
In memory locations 000h to 0FFh, only the byte mode is possible. In memory locations 100h to 1FFh, only
the word mode is possible. Memory locations 010h to 0FFh are reserved for 8-bit peripheral modules, and
the locations between 100h and 1FFh are reserved for 16-bit peripheral modules.

FFFFh
FFE0h
FFDFh

C000h

03FFh

0200h

01FFh

0100h

00FFh

0010h
000Fh
0000h

INT. VECTOR

16 KB EPROM

512 B RAM

16 Bit Peripheral Modules

8 Bit Peripheral Modules

Special Function Register

MSP430x320

Figure 2–1. Memory Organization

FFFFh
FFE0h

FFDFh

8000h

05FFh

0200h

01FFh

0100h

00FFh

0010h

000Fh

0000h

INT. VECTOR

32 KB EPROM

1 KB RAM

16 Bit Peripheral Modules

8 Bit Peripheral Modules

Special Function Register

MSP430x330

2–1

2.3 Commands

h The h command displays the Help Command screen shown in Figure 2–2 with the available

commands.

Enter h at the command prompt

>Monitor Commands

h help
b,w byte, word mode
i,w monitor, user reset
r[x] inspect registers
mx[n] inspect memory
ex n eprom erase check
@x .. q load program
d run DEMO
sx set breakpoint
cx clear breakpoint
g go (free run)
<space> single step
<ESC> exit command

>_

2–2

Figure 2–2. Help Command

b,w The b and w commands shown in Figure 2–3 switch to byte or word indication mode. The two

indication modes are only important for the memory inspect command m. The Monitor completes the
entered command (b

>MSP–STK430A320

>byte
>m0300 10
mem 0300 : 40 00 80 80 00 00 52 00 41 10 01 06 04 20 02 00
>word
>m0300 10
mem 0300 : 0040 8080 0000 0052 1041 1601 2004 0002

yte or word).

Enter b at the command prompt

Enter w at the command prompt

Figure 2–3. Byte, Word Commands

2–3

i The i command, shown in Figure 2–4, initializes the entire monitor program. This command performs

a software reset of the STK/EVK, but is only possible if the monitor is still running. If the contents of
memory location 3DEh are AA55h, the i command will start the user application. Turn off the hardware
supply voltage to return control to the monitor. This clears the bit-pattern AA55h.

Enter i at the command prompt

>init

MSP–STK430A320

Figure 2–4. Initializing the Terminal Program Command

2–4

u The u command, shown in Figure 2–5, sets the user PC to the start vector of the loaded user program.

This performs a user reset of the application. In this example, the start vector of the user application,
located at address 03FEh, is 0300h.

Enter u at the command prompt

>user reset _PC_ _SP_ _SR_
reg 0000 0300 03de 0008 000u0 f48cP1c14 0069 000e
reg 0008 1a28 400f 0000 ffd0 4040 6803 e2c2 07a0

>

Figure 2–5. User Reset Command

2–5

r[i] The r <ENTER> command, shown in Figure 2–6, without a specific register number, shows all 16 CPU

registers R0 to R15. With this syntax, a modification of the register contents is not possible.

Enter r then <ENTER> at the command prompt

>init

MSP–STK430A320

>r
reg 0000 : 0300 03de 0008 0000 f48c 0010 0069 000e
reg 0008 : 1a28 402a 0000 ffd0 4040 6803 e2c2 07a0

>

Figure 2–6. Register Command

2–6

Entering the command with the hexadecimal register number r[i] <ENTER> as shown in Figure 2–7, results
in displaying only the contents of the dedicated register i.

Type r5 <ENTER> at the command prompt

>r5
reg 0005 : 0010 _

Figure 2–7. Register Specified Command

NOTE: Modification of the Registers R1, R3, and R4

The Monitor Program does not allow the modification of registers R1, R3, and R4. R1 is the
stack pointer and can not be modified because of the internal program structure of the monitor.
R3 is the constant generator register and therefore cannot be modified. R4 is internally used
by the monitor, therefore, modification of R4 by the user application code will overwrite the
correct function in the monitor program and cause improper operation.

2–7

Figure 2–8 shows the procedure for changing data in a register. Write new data into register r[i] by pressing
<ENTER> and the program displays the next register.

Type r5 <ENTER> at the command prompt

Type the new desired register contents and press <ENTER>

>init

MSP–STK430A320

>r5
reg 0005 : 0010 ffff
reg 0006 0069
>r5
reg 0005 : 0010 ffff_

2–8

Type r5 again to view the new content of the register

If it is not desired to modify additional registers press <ESC>

Figure 2–8. Modify One Register

Figure 2–9 shows the procedure to modify an additional register. Press <ENTER>, and the program displays
the next register.

Enter r <ENTER> to show the modified register contents

Press <ESC> here

>init

MSP–STK430A320

>r5
reg 0005 : 0010 aaaa
reg 0006 0069 bbbb
reg 0007 000e
>r
reg 0000 : 0300 03de 0008 0000 f48c aaaa bbbb 000e
reg 0008 : 9a28 4092 0000 ffd0 4040 6807 e6ca 87a4

>

Modified registers r5, r6

Figure 2–9. Modify Additional Registers

2–9

Figure 2–10 shows the proper way to change incorrect entries. Using the Arrow, Delete or Insert keys as
inputs causes unpredictable behavior. After entering an incorrect register content, the entire input should
be entered again. Another method is to press <ESC> and to enter the r[i] command again.

NOTE:

The ENTER key must never be pressed after entering an incorrect input.

To start the register command type r <ENTER>

Type r5 <ENTER> to modify register r5

Incorrect terminal input ’$%^&’

Correct terminal input to modify r5

>init

MSP–STK430A320
>r
reg 0000 : 0300 03de 0008 0000 f48c 0010 0069 000e
reg 0008 : 9a28 406c 0000 ffd0 4040 6807 e2ca 87a0

>r5
reg 0005 : 0010 $%^& 4567
reg 0006 0069
>r
reg 0000 : 0300 03de 0008 0000 f48c 4567 0069 000e
reg 0008 : 9a28 406c 0000 ffd0 4040 6807 e2ca 87a0

>

2–10

Enter <ESC>

Figure 2–10. Revise Memory Modification

mx[n] The m command allows the user to inspect (read/modify/write) memory locations. Use the m

command in conjunction with the b or w commands. The b or w command displays the memory as
shown in Figure 2–11.

Enter b at the command prompt

Enter w at the command prompt

Enter m220 20 at the command prompt

>init

MSP–STK430A320

>byte
>m220 20
mem 0220 : 48 00 02 00 20 20 00 08 00 20 00 00 09 00 02 80
mem 0230 : 01 00 00 00 00 00 02 00 00 44 20 00 00 50 00 00
>word
>m220 20
mem 0220 : 0048 0002 2020 0800 2000 0000 0009 8002
mem 0230 : 0001 0000 0000 0002 4400 0020 5000 0000
>_

Figure 2–11. Memory Byte, Word Command

The address x shown above as 220 must be entered to define the memory location. The number n, shown
above as 20, is optional. It defines the number of memory bytes that are to be displayed. Entering the m
command without n allows the memory contents at address x to be displayed or modified.

NOTE: Interrupt.
Viewing large memory areas will take some time because the output function to display memory
contents cannot be interrupted while the UART is operating in the half duplex mode.

2–11

Figure 2–12 shows how to modify memory contents. Modify the memory by typing in new data and pressing
<ENTER>. The program displays the next memory location. If no modification is necessary press
<ENTER>. T o exit the memory command (mx) press the <ESC> key. Pressing <ENTER> toggles through
memory locations, displaying each new location after <ENTER>.

Switch to byte indication mode

Switch to word indication mode

Show and modify memory location 0300h in byte mode

Show and modify memory location 0300h in word mode

Enter aa then <ENTER> to modify memory

Enter bbcc then <ENTER> to modify memory

>init

MSP–STK430A320
>byte
>m0300
mem 0300 : 31 aa
mem 0301 40
>word
>m0300
mem 0300 : 40aa bbcc
mem 0302 : 0400
>m0300
mem 0300 : bbcc
>_

2–12

Press <ESC> here

Show only one memory location 0300h in word mode

Figure 2–12. Memory Modification

To revise an incorrect terminal input, perform the following functions as shown in Figure 2–13. Using the
Arrow, Delete or Insert keys as inputs causes unpredictable behavior. After entering an incorrect register
contents, the entire input should be entered again. Another method is to press <ESC> and enter the m
command again. Never type <ENTER> after entering an incorrect input.

Start the memory mode

Incorrect terminal input

Correction

Press <ESC>

>init

MSP–STK430A320

>byte
>m@#$% 20300 2
mem 0300 : 31 40
>m@#$% 2
>m0300 2
mem 0300 : 31 40
>_

View memory contents

Figure 2–13. Revised Memory Modification

2–13

@x The @x command loads program/data section(s), byte by byte, into the RAM/EPROM. A program

algorithm detects the correct download section (in the RAM or EPROM) and runs automatically . The
transfer can be made by using a keyboard or by file transfer (pull-down menu Transfers/Send Text
File in Hyperterminal program). If download is performed manually, it can be terminated with a q
keystroke. Normally the data associated with the load command is a content of linker or
assembler-generated program/data files.

Figure 2–14 is an example of the format of such a program/data file:

>@0220
C2 43 12 00 3B 40 B4 02 92 12 D4 FF F2 40 FF 00
32 00 B0 12 90 D8 B0 12 48 D8 B0 12 C8 D7 B0 12
72 D7 B0 12 0E D7 B0 12 56 02 B0 12 72 D7 B0 12
1C D8 30 40 52 02 06 12 F2 F0 FB 00 03 00 B2 40
1D 00 12 01 B2 40 0B 09 14 01 56 42 03 00 66 F2
FC 27 16 42 18 01 36 90 00 10 05 38 3B 40 40 DA
92 12 D4 FF 04 3C 3B 40 4C DA 92 12 D4 FF 36 41
31 40 00 03 B2 40 80 5A 20 01 30 40 20 02 06 12
52 12 12 00 52 12 11 00 F2 40 19 00 12 00 F2 42
11 00 B2 40 FF 00 12 01 16 42 10 01 F2 41 11 00
F2 41 12 00 76 F0 EB 00 B0 12 7A D7
@03FE
20 02
q
>downloaded _PC_ _SP_ _SR_
reg 0000 : 0220 0400 0008 0000 f8b8 0010 0000 0003
reg 0008 : 0000 2837 0000 f0c2 fffe fffe fffe fbfe

Figure 2–14. Transfer Data Command

The @x command sets the memory-modification address to the address where program/data files are
stored. All code lines following the @x command represent data in byte format. These bytes will be copied
sequentially to the specified section address. The q command terminates the section input and returns the
control back to the Monitor Program.

NOTE: Programming an EPROM

While programming the EPROM, be sure that the file being used has the correct section
addresses and contains the correct program/data. Programming an EPROM location once will
prevent a second programming at this location in the STK. For more information see the
Hardware Installation section in this manual.

2–14

ex n The EPROM erase check (ex n) command verifies that the EPROM is empty. The EPROM is empty

if the contents of all EPROM-memory locations are FFh. The x represents the starting address to
verify that the EPROM has been erased. The n portion of this command will show the number of
bytes that have been erased. The Monitor ceases checking the EPROM if a memory location other
than FFh is detected and displays that memory location as shown in the Figure 2–15.

Enter mC040 20 <ENTER> to start memory mode (to show 20h)

Check if there is memory space at C040h for 20h Words

Memory location C040h is not erased and is displayed

>mC040 20
mem c040 : ffff ffff ffff ffff ffff ffff ffff ffff
mem c050 : 4035 000f 43c5 0030 8315 23fc 4130 ffff
>eC040 20
mem c050 : 4035>

Figure 2–15. EPROM Erase Check Command

2–15

s The s command allows a breakpoint to be set. The program supports the capability of having two

breakpoints. Breakpoints may be set only if the program is in RAM. Typing an s shows the
breakpoints that are currently set. Figure 2–16 shows how to enter the location of the breakpoint.

Set a breakpoint by Typing ‘s’

Enter the location of the breakpoint: 24e

MSP–STK430A320

>Set Bkpt 0000 0000 24e

Figure 2–16. Location of a Breakpoint Command

Both breakpoint addresses are displayed. A breakpoint address that contains all zeros indicates that no
breakpoint is set. Enter the address to set a breakpoint. Pressing the <RETURN> key activates the
breakpoint at that address.

2–16

The address of the two breakpoints should not be identical. Only two breakpoints are supported, a third
breakpoint cannot be set. In order to set another breakpoint, one breakpoint has to be cleared first with the
c command. Figure 2–17 shows the breakpoint after entry.

To set a breakpoint type s

Enter the location of the breakpoint: 24e <ENTER>

>init

MSP–STK430A320

>Set Bkpt 0000 0000 24e
>Set Bkpt 024e 0000

Press <ESC> here

Figure 2–17. Set a Breakpoint Command

2–17

c The c command is used to clear a breakpoint. Typing c shows the set breakpoints, as shown in

Figure 2–18.

Clear a breakpoint by typing a ‘c’

>Clr Bkpt 024e 0000

Figure 2–18. Clearing a Breakpoint Command

To clear one of the breakpoints (other than zero), it is necessary to enter the associated address. Typing
the <ENTER> key after entering the address clears the breakpoint. See Figure 2–19.

To clear a breakpoint type c

To clear a breakpoint enter the location: 24e <ENTER>

2–18

>Clr Bkpt 024e 0000 24e
>set Bkpt 0000 0000

Press <ESC> here

Start set breakpoint mode by typing s to show the cleared breakpoint

Figure 2–19. Clearing a Breakpoint Location

g The g command starts/restarts the user application that is loaded into RAM. The system retrieves

the start vector of a user’s application from memory location (3FEh on the 320 STK/EVK, 5FEh on
the 330 EVK) if a new program is loaded, or after executing a PUC command or a user reset.
Otherwise, the program execution continues with the actual PC (R0). Return to the Monitor occurs
after pressing any key on the keyboard. The g command functions as stated if the user application
is not running in an interrupt routine (GIE=0 if interrupt nesting is not allowed), and the user
application has not disabled the GIE bit.

>init

MSP–STK430A320

>@0300
31 40 00 04 B2 40 80 5A 20 01 07 43 17 53 FE 3F
@03FE
00 03
q
>downloaded _PC_ _SP_ _SR_
reg 0000 : 0300 03de 0008 0000 f48c 1d14 0069 000e
reg 0008 : 1a28 4032 0000 ffd0 4040 6803 e2c2 07a0
>go.._

Enter g to start the user application

Figure 2–20. Starting the Application Command

2–19

2–20

3 Monitor Restrictions

3.1 Register R4

The Monitor Program uses the R4 register internally to return data from the user application to the
Hyperterminal. Modifications to the value stored in R4 will result in unexpected behavior of the Monitor
Program. The Monitor command r, to change the register contents, is not supported for R4. The register R4
can be modified by the user application code. Consequently , the user should exercise caution when using
this register.

It is possible to interrupt the user application by pressing the ESC key on the keyboard. This works only if
the GIE bit has not been cleared. One exception is possible in spite of a cleared GIE flag. If the user
application runs on a breakpoint, program execution will branch to the Monitor as the program runs.

Problems may occur if the user application uses most of its time in interrupt routines. While the application
is servicing an interrupt, a new interrupt can only occur if the GIE bit has been set. The GIE bit is set only
if the first interrupt routine explicitly sets it within the routine itself, thereby allowing for nested interrupts.

Starting the user application with the Monitor causes the Monitor Program to set the GIE bit. If the GIE-bit
was reset before in the user application, it will remain set. This ensures the availability of the RS232
communication but influences the user’s software application. The particular interrupts can be enabled with
their associated interrupt flags.

3.2 The Instruction CALL R4

In the user application, it is possible to return to the Monitor with the instruction CALL R4. The monitor should
be started prior to this so that the contents in R4 are valid and to initialize the Monitor.

A single step should not be executed over the CALL R4 instruction because this will cause unpredictable
behavior of the Monitor. The following code is an example that uses the instruction CALL R4.

NOTE:

Execute the single step command only if the program counter points to an instruction in
the RAM.

WDTCTL .equ 0120h
WDTHold .equ 80h
WDT_wrkey .equ 05a00h

.text 0240h

RESET: MOV #03DEh,SP

MOV # (WDTHold+WDT_wrkey),&WDTCTL ; stop Watchdog
MOV #0h,R7

WAIT: INC R7

CALL R4
.sect “Int_Vect” ,03FEh

.word RESET
.end

Figure 3–1. CALL R4 Instruction Code

; Timer

3–1

3.3 Peripheral Hardware/Registers

Do not modify the following peripheral registers and bits because UART operation uses these register and
bits.

T able 3–1. Peripheral Registers and Bits

REGISTER ADDRESS BITS

TCDAT 44h All
TCPLD 43h All
TCCTL 42h All
IFG1 02h 3
IE1 00h 3
P0IES 14h 1, 2
P0DIR 12h 1, 2
P0IFG 13h 2
P0IE 15h 2

3.4 RAM Locations for the Monitor

The Monitor Program uses eighteen bytes of RAM, from address 200h to 212h, within the RAM area of the
MPS430x32x (which ranges from 200h to 3FFh for the MSPx32x family , and 200h to 5FFh for the MSPx33x
family). The user application should not use this memory area.

The Monitor Program needs no stack while running the user application. If the user application returns to
the Monitor Program using a breakpoint, single step, or keyboard interrupt, an additional stack size of 32h
bytes is needed for the Monitor Program. This Monitor Program stack is always set up on the top of the user
stack. When returning to the user application, the Monitor Program clears the entire user stack. If the user
program is inactive and the Monitor Program is running, 50 bytes are put onto the stack. The stack pointer
shown in Figure 3–3 reflects the application situation, not the actual Monitor stack pointer. In these 50 bytes,
all register data valid in the application program is saved to be restored when the user application is
reactivated. Returning to the user application, the 50 bytes used are freed, and the stack pointer is pointing
to the user application.

3–2

In most cases, it is efficient to initialize the user stack which is allowed to grow (downwards) until it reaches
the address 270h (26Fh–32h=23Eh). Thus, the resulting size of the maximum user stack is 16Dh
(3DCh–272h=16Ah) on the MSP430x325 family and 360h (5DCh–272h = 36Ah) on the MSP430x33x family .

Interrupt

Vectors

Identification Bit Pattern

Maximum Program,

Stack and Data Size

of User Application

Is 3FEh – 272h

Stack Needed From

ROM Monitor

Temporary

Burn Routine

RAM Area Always Reserved

From ROM Monitor

RAM Area 272h–3FEh for

the MSP430x320

3FEh

3E0h
3DEh

3DCh

272h
23Eh+32h = 270h

23Eh
23Dh

214h
212h

200h

Interrupt

Vectors

Identification Bit Pattern

Maximum Program,

Stack and Data Size

of User Application

Is 5FEh – 272h

Stack Needed From

ROM Monitor

Temporary

Burn Routine

RAM Area Always Reserved

From ROM Monitor

RAM Area 200h–5FFh for

the MSP430x330

5FEh

5E0h
5DEh

5DCh

272h
23Eh+32h = 270h

23Eh
23Dh

214h
212h

200h

Figure 3–2. RAM Area 272h to 3FEh

3–3

The user application data is located within the RAM area from 272h to 3FEh (5FEh for 33x). The locations
used statically (200h to 214h) and dynamically (stack) by the Monitor Program limit the size of the available
RAM. Due to limited size, two memory configurations are recommended as shown in Figure 3–3.

User application inactive,

User application active

3FEh

Interrupt Vectors

3E0h

Monitor Program active
single step, breakpoint,

<ESC>

3FEh

Interrupt Vectors

3E0h

Identification Bit Pattern

SP

Address Range for

Program, Stack and

Data of User

Application is 3DCh

to 214h

NOTE:

The User
Application Does
Not Set the Stack

Pointer SP

RAM Area Always Reserved

for ROM Monitor

3DEh

3DCh

214h
212h

200h

Identification Bit Pattern

Stack Used by

Application

Stack Needed From

SP

ROM Monitor, 50 Bytes

Maximum Program,

Stack and Data Size

of User Application

Is Reduced by 50

Bytes, After Return

to the Monitor

Program

RAM Area Always Reserved

For ROM Monitor

3DEh

214h
212h

200h

NOTE:

The identification bit pattern determines if the monitor code or a user’s code (program)
is executed after a power-up or hardware reset (PUC). See Section 5.2. The temporary
burn routine addresses are allocated for the EPROM burn routine, which must run in the
RAM. When data is written into the EPROM (program memory), code in the EPROM
cannot be executed. Therefore, the burn program has to be in RAM (loaded from the
EPROM) so it can be executed.

Figure 3–3. RAM Area 200h to 3FFh for the MSP430x32x Family

In most cases it is efficient not to initialize the user-stack, but to use the stack pointer set by the monitor .

3–4

3.5 Writing Data Into the EPROM

When data is written into the EPROM address range, software code is written into RAM locations 214h to
23Dh. All addresses 1000h or higher are assumed to be EPROM. After the write operation is completed,
the code in the RAM is no longer needed. The code is written into RAM when a write into the EPROM address
range is performed. Ensure that the data in these locations are not needed when the EPROM write code
is temporarily loaded into those locations.

A write into EPROM can be done when an application program is executed, or when the monitor is active.
For example, when the mx[n] command is executed:

No write to EPROM active

Available RAM for

User Application

RAM Area Always Reserved

for ROM Monitor

214h
212h

200h

Available RAM for

User Application

Temporary

Burn Routine

RAM Area Always Reserved

for ROM Monitor

23Eh
23Dh
214h
212h

200h

Figure 3–4. Temporary Burn Routine in the MSP430x32x RAM Area

User application data for the MSP430X33x family should be located within the RAM area (from 200h to
5FFh). The locations used statically (200h to 214h), and dynamically (stack) by the Monitor Program limit
the size of the available RAM.

NOTE:

The Identification Bit Pattern defines if the monitor code or a user’s code (program) is
executed after a power-up or hardware reset (PUC). See Section 5.2. The Temporary
Burn Routine user’s addresses are allocated for the EPROM burn routine which must
run in the RAM. When data is written into the EPROM (program memory), code in the
EPROM can not be executed. Therefore, the burn program has to be in the RAM (loaded
from the EPROM so it can be executed).

3–5

3–6

4 Treatment of Interrupts

This chapter describes the special treatment of interrupts in the Monitor environment.

4.1 Use of Interrupts in the Monitor Environment

The interrupt structure of the MSP430 is fully supported by the terminal program with one exception, the NMI
interrupt has the same interrupt vector as the RESET interrupt.

There are no restrictions on the interrupt flags, but certain restrictions apply to the interrupt vectors. It is
impossible to program the interrupt vectors located in the address range FFECh to FFFEh, because they
are preprogrammed in the EPROM area and can not be modified. The Monitor Program has the flexibility
to allow a second set of interrupt vectors in the RAM address range 3E0h to 3FEh (5E0h–5FEh for the
MSP430X33x family) as shown in Figure 4–1. The Monitor Program branches program execution if an
interrupt occurs to the associated interrupt vector located in the second interrupt vector address range. The
instruction used is an absolute BR command (i.e., BR &0FFEAh for the ADC interrupt). Therefore, during
the use of the Monitor Program, the interrupt vectors are moved by an amount of FC00h below their normal
location.

Reset

NMI
P0.0 Interrupt
P0.1 Interrupt

Watchdog Interrupt

ADC Interrupt

Basic Timer Interrupt

Port0.2 to 0.7 Interrupt

FFFEh

Interrupt

FFE0h

Reset

NMI
P0.0 Interrupt
P0.1 Interrupt

Watchdog Interrupt

ADC Interrupt

Basic Timer Interrupt

Port0.2 to 0.7 Interrupt

Figure 4–1. Monitor Interrupts for the MSP430x32x Family

03FEh

Interrupt

03E0h

4–1

Figure 4–2 shows the handling of a P0.0 interrupt for the MSP430X32x family. For the MSP430X33x,
replace address 03FAh with 05FAh.

P0.0 Interrupt

FFFAh

XXXX

XXXX BR & 03FAh

03FAh

YYYY

YYYY Is The Start Address
Of The Interrupt Service Routine

YYYY

Figure 4–2. P0.0 Interrupt Example

The number of cycles an interrupt is additionally delayed in the Monitor Program depends on the type of
interrupt received.

T able 4–1. Type of Interrupt

TYPE OF INTERRUPT DELAY (NUMBER OF CYCLES)

RESET 14
IN_P01 10

All other interrupts 3

NOTE: Status Register Setting Exception After Interrupts

After entering the interrupt service routine of a Reset or a P0.1 interrupt, the zero-bit Z
and the carry-bit C in the status register SR are not reset as expected.

The interrupt vectors and the associated interrupt vector addresses of the MSP430E325 device are shown
in Table 4–2 (or Table 4–3 for the MSP430E33x).

4–2

T able 4–2. Interrupt Vectors for the MSP430x32x Family

INTERRUPT SOURCE

Power-up external reset watchdog RSTI†, WDI
NMI

Oscillator fault
Dedicated I/O P0.0IFG Maskable 3FAh 13
Dedicated I/O P0.1IFG Maskable 3F8h 12

Watchdog timer WDTIFG Maskable 3F4h 10

ADC ADCIFG Maskable 3EAh 5
Timer port ‡ Maskable 3E8h 4

Basic timer BTIFG Maskable 3E2h 1
I/O Port 0 P0.27IFG

†

Multiple source flags

‡

Timer Port interrupt flags are located in the module

INTERRUPT

FLAG

†

NMIIFG

†

OFIFG

†

†

SYSTEM

INTERRUPT

Reset 3FEh 15, highest
Nonmaskable

Nonmaskable

Maskable 3F6h 11

Maskable 3F2h 9
Maskable 3F0h 8
Maskable 3EEh 7
Maskable 3ECh 6

Maskable 3E6h 3
Maskable 3E4h 2

Maskable 3E0h 0, lowest

WORD

ADDRESS

3FCh 14

PRIORITY

T able 4–3. Interrupt Vectors for the MSP430x33x Family

INTERRUPT SOURCE

Power-up external reset watchdog RSTI†, WDI
NMI

Oscillator fault
Dedicated I/O P0.0IFG.0 Maskable 3FAh 13
Dedicated I/O P0.1IFG.1 Maskable 3F8h 12

Watchdog Timer WDTIFG Maskable 3F4h 10
Timer A CCIFG0
Timer A TIFG
UART Receive URXIFG Maskable 3EEh 7
UART Transmit UTXIFG Maskable 3ECh 6

Timer Port ‡ Maskable 3E8h 4
I/O Port P2 P2IFG.07
I/O Port P1 P1IFG.07
Basic Timer BTIFG Maskable 3E2h 1
I/O Port 0 P0.27IFG

†

Multiple source flags

‡

Timer Port interrupt flags are located in the module

INTERRUPT

FLAG

†

†

NMIIFG

†

OFIFG

††

††

ADCIFG Maskable 3EAh 5

†
†

†

SYSTEM

INTERRUPT

Reset 3FEh 15, highest
Nonmaskable

Nonmaskable

Maskable 3F6h 11

Maskable 3F2h 9
Maskable 3F0h 8

Maskable 3E6h 3
Maskable 3E4h 2

Maskable 3E0h 0, lowest

WORD

ADDRESS

3FCh 14

PRIORITY

4–3

4–4

5 Half Duplex Monitor Software UART

The Monitor Program provides several functions for handling serial data communications using the RS-232
interface. The user can call these functions by using the associated vectors in the terminal program. Use
the absolute address mode to call these functions. For example, a possible syntax for preparing the half
duplex software UART to receive characters is:

CALL &0FFD6h ;in address FFD6h the vector of RX_Prep is stored

another possible syntax is:

RX_Prep .equ 0FFD6h
CALL &RX_Prep ;in address FFD6h the vector of RX_Prep is stored

The STK/EVK software UART cannot be used for binary transfers for the following two reasons:

• The protocol has only seven data-bits.

• A zero cannot be received because this is the detection scheme for no-character-received.

The vectors related to these functions are stored in the following locations (see Table 5–1):

T able 5–1. Function/Vector

FUNCTION NAME VECTOR ADDRESS FUNCTION PURPOSE

TX_Word 0FFD0h Transmit 1 space and a four digit hex number in R11
TX_Char
TX_Table
RX_Prep
TX_Prep
INT_RXTX 0FFDAh Interrupt service routine for receive and transmit
Ret_Mon 0FFDCh Return to the Monitor with a br Ret_Mon statement

†

Calling TX_Char, TX_Table, TX_Prep, or RX_Prep enables the GIE flag in the status register (SR). The GIE bit remains
set even if it was disabled before calling these routines.

†

†
†
†

0FFD2h Transmit 1 char in TXData (20Eh)
0FFD4h Transmit table (string address should be in R11)
0FFD6h Prepare halfduplex software UART for receive
0FFD8h Prepare halfduplex software UART for transmit

5.1 Transmission Parameters of the Software UART

The transmission parameters of the MSP-STK/EVK430x320 and EVK430x330 are:

• 2400 Baud

• 1 start-bit

• 7 data-bits

• 1 parity-bit (even)

• 1 stop-bit

The RTS and DTR pins of the serial port must be set to high to provide the supply voltage for the STK/EVK
if no battery is assembled. This is done automatically in the Windows HyperTerminal program. If other
communication software is used, the specified pin levels must be met.

5.2 Identification of Bit Pattern AA55h

The interrupt service routine INT_RXTX is used for the receive and transmit function. If another INT_RXTX
service routine is being used, the identification bit pattern AA55h must be stored in memory location 3DEh
(5DEh for the MSP430x33x family). Otherwise, the INT_RXTX service routine will never branch program
execution to the vector located in the user interrupt vector table. This pattern remains in memory until it is
changed by the program or the power is switched off.

5–1

The flow chart in Figure 5–1 I illustrates the entry point of the INT_RXTX interrupt service routine:

INT_P0.1

no yes

Identification ?

Contents Of Memory

Location 3DEh

= AA55h

yes

Receive/Transmit Interrupt Service

TX RX

Half Duplex Software

UART Prepared For
Receive or Transmit ?
(PREPRX or PREPTX)

P0.1 Interrupt Continues Program Execution

Upon The User Interrupt Vector Stored In

Memory Location 3F8h

User Interrupt Service Routine Branches

To INT_RXTX Service Routine From

ROM-Monitor ?

(First Instruction = CALL &0FFDAh ?)

Start Of Monitor Interrupt

Service Routine INT_RXTX

Routine

no

User Interrupt

Service Routine is

Continued

Interrupt Service Handler For Transmit Interrupt Service Handler For Receive

Figure 5–1. Identification of Bit Pattern AA55h for the MSP430X32x Family

5–2

NOTE: Init Command

Do not use the Monitor init command out of the terminal emulator while the bit pattern
AA55h is stored in memory location 3DEh on the MSP430X32x, or 5DEh on the
MSP430X33x family . Otherwise, the user application with the reset vector stored at 3FEh
(5FEh for the MSP430X33x family) will be started.

To use the INT_RXTX interrupt service routine, first load the P0.1 interrupt-vector, which is responsible for
the timer interrupt used in the software UART . The P0.1 interrupt vector is stored in the user interrupt vector
table at address 3F8h.

The following code is an example of the user interrupt vector table and the associated branch to the
INT_RXTX routine.

UART: br &0FFDAh
RESET: br &0FFFEh

.sect “Int_Vect”,03E0h ; Use 05E0h for the MSP430X33x family
.word RESET ; Port0, bit 2 to bit 7
.word RESET ; Basic Timer
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; EOC from ADC
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; no source
.word RESET ; Watchdog/Timer, Timer mode
.word RESET ; no source
.word UART ; Address of UART handler
.word RESET ; P0.0
.word NMI ; NMI, Osc. fault
.word RESET ; POR, ext. Reset, Watchdog
end

In this example, all other interrupts will continue program execution at the reset vector of the terminal
program stored at address FFFEh.

NOTE: Identification Pattern AA55h

The identification pattern must be programmed as the last word of the complete download. To
assure this, the section containing only the identification, is the last section in the source file.

5–3

5.3 Special Treatment of <ESC> in the Software UART

The software UART treats a received ESC character in two different ways:

• The software UART receives the ESC character and stores it at address 210h. The condition,
therefore, is that bit 0 in memory location 200h is reset.

• The software UART receives the ESC and returns back to the Hyperterminal. The condition is
that bit 0 in memory location 200h be set.

End of ROM-Monitor

Interrupt Service Routine

Contents of

yes no

Memory Location

3DEh is AA55h for

MSP430X32x

(or 5DEh is AA55h

for MSP430X33x)

yes

yes

The Return From Interrupt

is By-Passed

Into ROM-

Monitor

Normal Return Out of

INT_RXTX

Interrupt

Service

no

no

Bit 0 in Memory

Location 200h Set ?

Received Character

is <ESC>

Figure 5–2. Special Treatment of ESC

BIC #01h,&200h ; reset bit 0, because no special treatment of <ESC> is

; wanted

BIS #01h,&200h ; reset bit 0, because special treatment of <ESC> is

; wanted

NOTE: Memory Location 200h

Only bit 0 in memory location 200h may be modified. A modification of the higher bits may result
in an unpredictable behavior of the terminal program.

5–4

5.4 Transmitting One Character

To transmit one character, copy AA55h to memory location 3DEh, or memory location 5DEh for the
MSP430X33x family . Store the character to transmit in RAM-location 020Eh.

TX: MOV #0AA55h,&03DEh ; &05DEh for MSP430X33x

MOV.B #‘a’,&TX_Data ; put char to TX_Data

Call the function TX_Char to transmit the character stored at location 20Eh.

call &0FFD2h ; call of TX_Char

The function TX_Char includes the call of TX_prep implicit which prepares the half-duplex software UART
to receive. Therefore, it is not necessary to call TX_Prep before calling TX_Char.

5–5

The following code in Figure 5–3 is an example of transmission of the single character s.

WDTCTL .equ 0120h
WDTHold .equ 80h
WDT_wrkey .equ 05a00h
TXCHAR .equ 0FFD2h
TXTABLE .equ 0FFD4h
PREPRX .equ 0FFD6h
PREPTX .equ 0FFD8h
INT_RXTX .equ 0FFDAh
TXDATA .equ 020Eh
RXBUF .equ 0210h

.text 0240h

RESET: MOV #03DEh,SP ; use #05DEh on the MSP430X33x

MOV #(WDTHold+WDT_wrkey),&WDTCTL ; stop Watchdog Timer
EINT ; enable interrupt

TX: MOV #0AA55h,&03DEh ; prepare software UART for the use

; in user application
(05DEh FOR MSP430X33x)

MOV.B #‘a’,&TXDATA ; put char to TXDATA

; BIC #01h,&200h ; use only if no special

; treatment of ESC is wanted

CALL &TXCHAR ; call transmit sub-routine in

; monitor

CALL &PREPRX ; prepare software UART for receive

; to get back to monitor with ESC

MOV #00h,&03DEh ; prepare software UART only for

; the use in the Hyperterminal

(05DEh FOR MSP430X33x)
ENDL: JMP ENDL
UART: BR &INT_RXTX

.sect “Int_Vect”,03E0h ; (use 05E0h on the MSP430X33x)
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word UART ; UART Routine
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.end

5–6

Figure 5–3. Transmitting the s Character

In Figure 5–3, the endless loop at the end of the program can be interrupted by pressing <ESC> in the
HyperT erminal. If no special treatment of <ESC> is required in the software UART , bit 0 in RAM location 200h
must be cleared. This bit is the ESC-active-flag and allows itself to return back to the Hyperterminal when
pressing the ESC key.

Conditions for implementation:

• Correct setting of the P0.1 interrupt vector in the user interrupt vector table

• The first statement of the user interrupt handler is an absolute branch to the INT_RXTX interrupt

service routine.

• GIE is enabled.

• The halfduplex software UART is set up to receive.

NOTE: Clear the Bit Pattern AA55h

Do not try to load a program while the bit pattern AA55h is stored at address 3DEh on
the MSP430x32x, or 5DEh on the MSP430x33x. To load a new program, clear the bit
pattern AA55h at address 3DEh on the MSP430x32x, or 5DEh on the MSP430x33x, or
switch off the STK/EVK for a short time to clear the RAM.

5.5 Transmitting a String

The first step to transmit a string is to move the bit pattern AA55h to memory location 3DEh on the
MSP430x32x, or 5DEh on the MSP430x33x. The address of the string must be stored in register R1 1.

The following program transmits the TEST String:

WDTCTL .equ 0120h
WDTHold .equ 80h
WDT_wrkey .equ 05a00h
TXCHAR .equ 0FFD2h
TXTABLE .equ 0FFD4h
PREPRX .equ 0FFD6h
PREPTX .equ 0FFD8h
INT_RXTX .equ 0FFDAh
TXDATA .equ 020Eh
RXBUF .equ 0210h

.data 0300h

STRING: .string “TEST”

.byte 0h
.text 0240h

RESET: MOV #03DEh,SP ; #05DEh on the MSP430X33x

MOV #(WDTHold+WDT_wrkey),&WDTCTL ; stop Watchdog Timer
EINT ; enable interrupt

TX: MOV #0AA55h,&03DEh ; prepare software UART for the

; use in user application
(&05DEh on the MSP430X33x

MOV #STRING,R11 ; Test: TX_table

; BIC #01h,&200h ; use only if no special

; treatment of ESC is wanted

CALL &TXTABLE ; call transmit sub-routine in

; monitor
(05DEh on the MSP430X33x

CALL &PREPRX ; prepare software UART for

5–7

; receive to get back to monitor
; with ESC

MOV #00h,&03DEh ; prepare software UART only for

; use in the ROM-Monitor

(&05DEh on the MSP430X33
ENDL JMP ENDL
UART BR &INT_RXTX

.sect “Int_Vect”,03E0h ; 05E0h on the MSP430X33x
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word UART ; UART Routine
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.end

5.6 Receiving a Character

A character received using the RS232 interface is written from the INT_RXTX interrupt routine into memory
location 210h. After performing a reset, this memory location contains zeros. Each byte (not equal to zero)
received is stored in memory location 210h.

The content of memory location 210h is checked to determine whether or not a byte has been received. After
reading the byte, this location must be cleared. The next-received character will overwrite memory location
210h with a new byte.

The following code is an example of receiving a character and transmitting the same character back.

WDTCTL .equ 0120h
WDTHold .equ 80h
WDT_wrkey .equ 05a00h
TXCHAR .equ 0FFD2h
TXTABLE .equ 0FFD4h
PREPRX .equ 0FFD6h
PREPTX .equ 0FFD8h
INT_RXTX .equ 0FFDAh
TXDATA .equ 020Eh
RXBUF .equ 0210h

.text 0240h

RESET MOV #03DEh,SP ; #05DEh on the MSP430X33x

MOV #(WDTHold+WDT_wrkey),&WDTCTL ; stop Watchdog Timer
EINT ; enable interrupt

RX MOV #0AA55h,&03DEh ; select user interrupt vector

; table (&05DEh on MSP430X33x)

CALL &PREPRX ; prepare software UART for

5–8

; receive to get back to monitor

; with ESC
WAIT TST.B &RXBUF ; char. in rxbuf ?

JEQ WAIT ; no, then wait

TX MOV.B &RXBUF,&TXDATA ; put char to TXDATA

CLR.B &RXBUF

; BIC #01h,&200h ; use only if no special

; treatment of ESC is wanted

CALL &TXCHAR ; call transmit sub-routine in

; monitor

CALL &PREPRX ; prepare software UART for

; receive to get back to monitor

; with ESC

JMP WAIT

UART BR &INT_RXTX

.sect “Int_Vect”,03E0h ; 050Eh on the MSP430X33x
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word UART ; UART Routine
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.end

The next example receives a string with a maximum of 100 (100=64h) characters, stores them, and then
transmits them after the <ENTER> key is pressed.

WDTCTL .equ 0120h
WDTHold .equ 80h
WDT_wrkey .equ 05a00h
TXCHAR .equ 0FFD2h
TXTABLE .equ 0FFD4h
PREPRX .equ 0FFD6h
PREPTX .equ 0FFD8h
INT_RXTX .equ 0FFDAh
TXDATA .equ 020Eh
RXBUF .equ 0210h
cr .equ 0dh

.data 0300h

STRING: .space 0064h ; reserves receive buffer

.text 00240H

RESET: MOV #03DEh,SP ; #05DEh on the MSP430X33x

MOV #(WDTHold+WDT_wrkey),&WDTCTL ; stop Watchdog Timer

5–9

EINT ; enable interrupt
CALL &PREPRX

MOV #0AA55h,&03DEh ; &05DEh on the MSP430X33x
RX: MOV #STRING,R7 ; load string address
WAIT: MOV.B #RXBUF,R6 ; char. in rxbuf ?

CMP.B #0h,r6

JEQ WAIT ; no, then wait

CLR.B &RXBUF

CMP.B #cr,R6 ; end of line

’ received?
JEQ TX
MOV.B R6,0(R7) ; put char. into string
INC R7
CMP #064h,R7 ; all 100 characters are

; received ?
JL WAIT

TX: MOV #STRING,R11 ; load string address

MOV #0h,1(R7) ; end of text character

; BIC #01h,&200h ; use only if no special

; treatment of ESC is wanted
CALL &TXTABLE
CALL &PREPRX
MOV #00h,&03DEh ; &05DEh on the MSP430X33x

ENDL; JMP ENDL
UART: BR &INT_RXTX

.sect “Int_Vect”,03E0h ; &05E0h on the MSP430X33x
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.word UART ; UART Routine
.word RESET ; Reset
.word RESET ; Reset
.word RESET ; Reset
.end

5–10

6 Using Interrupt Vectors in the EPROM

This chapter describes how to use interrupt vectors stored in the EPROM. The interrupt vectors are stored
in EPROM so they are not lost when power is removed.

6.1 The Identification Bit Pattern After a Reset

The reset start-up sequence checks the contents of memory location E9DEh to see if its contents are equal
to AA55h. If the memory location contents equal AA55h, the EPROM interrupt vector table with addresses
ranging from E9E0h to E9FEh is copied to the interrupt table in the RAM locations 3E0h to 3FEh on the
MSP430x32x, or 5E0h to 5FEh on the MSP430x33x family, and the key for the software UART is set to
AA55h to switch the monitor off. If the contents of memory location E9DEh are equal to 0000h, the next set
of interrupt vectors, located at 22h below the previous location, is tested like the first set previously
described. If the valid identification is set to AA55h after each power up or hardware reset, the user program
starts and the EPROM monitor is switched off. The only way back to the monitor is an indirect branch to
Ret_Mon (0FFDCh). The user program code implements a branch, as well as the condition for the branch.

6–1

Set Location of Identification

no yes

Identification ?

Contents of Identification

Address = AA55h

Reset

Address Pointer to E9DEh

Decrement Identification

Address Pointer By 22h

Identification ?

Contents of Identification

Address = 0000h

Copy EPROM Interrupt Vectors

And Identification AA55h
To RAM Interrupt Vectors

6–2

Start Monitor

Jump To New Reset Vector

Address In RAM

yes

Emergency Return

(Optional – User Defined

yes: BR Ret_Mon)

To Monitor ?

Figure 6–1. Identifying AA55h After Reset

NOTE:

It is important that the emergency return to the Monitor routine works properly and
has been tested in RAM before burning it into the EPROM. If the actual
identification address contains address AA55h, the Monitor will NEVER start again.
Be sure to program the key as the last step in the evaluation of a program, after all
errors have been fixed.

The following example demonstrates how to implement and test the emergency come-back to the monitor
routine:

1. Set the variable DVLP to 0 after the routine has been successfully tested in RAM. The variable
TRIAL indicates the number of interrupt tables that have been burned. The last necessary input
is the start address BEGIN.

2. Insert the address where the program is stored. To find a free section in EPROM, use the m or
the e command.

3. The terminal is switched off and the program enters an endless loop after burning the program
and executing a reset, or after starting it with the go command.

4. To come back to the monitor, press and hold down the demo button and press the button.

;****************************************************************************
; Demo for Emergency Burn-over of already written ID = AA55h

;****************************************************************************
DVKO .set 1 ; Development = 1, Final = 0

TRIAL .set 1 ; Progressing trial number )start=1)
BEGIN .set 0C000h ; Startaddress of (new) code in EPROM

;––– definition of testpin

pin .set 01h ; testpin is P0.0
P0DIR .set 12h ; Port 0 direction control register
P0IN .set 10h ; Port 0 input register

;––– ddfine working sections

.if DVLP =1
.text 00240h ; code in RAM during development
.else
.text BEGIN ; code in EPROM at final run
.endif

;––– test routine is waiting for low at testpin

start

bic.b #pin, P0DIR ; testpin is input
bit.b #pin, P0IN ; test testpin
jnz user_prg ; jump to user program if testpin = 1

clr 003DEh ; clear ID in RAM (005DEh on MSP430X33x)
br 0FFDCh ; branch indirect to Monitor

;––– insert here the start up of your user program

user_prg

jmp user_prg ; Dummy endless loop

;––– define reset vector in RAM for development

.sect “RAM_RES”, 03FEh ; 05FEh on MSP430X33x

6–3

.word start

;––– additionally define reset vector in EPROM if final version

.if DVLP = 0
.sect “EPRM_RES”, 0E9FEh–((TRIAL–1)*22h)
.word start

; write identification to EPROM if final version. This MUSt be the LAST

section !

.sect “IDENT”, 0E9DEh–((TRIAL–1)*22h)
.word 0AA55h
.endif

NOTE: Identification Pattern AA55h

Program the identification pattern as the last word of the download. T o assure this, the section
containing the identification should be the last section in the source file.

The following code is an example of the EPROM user interrupt vector table and the associated key for its
activation.

.sect “Int_Vect”,0E90Eh–((TRIAL–1)*22h)
.word POIFG.27 ; I/O Port 0
.word BTIFG ; Basic Timer
.word RESET ;
.word RESET ;
.word RESET ; (TimerB)
.word ADCIFG ; ADC, Timer/Port
.word RESET ; Timer/Port
.word RESET ; (SCI)
.word RESET ; (TimerA)
.word RESET ; (TimerA)
.word WDTIFG ; Watchdog timer
.word RESET ; (SPI)
.word POIFG.1 ; Dedicated I/O
.word POIFG.0 ; Dedicated I/O
.word OFIFG ; OSC. fault
.word WDTIFG ; Power-up, ext. Reset, Watchdog

6–4

.sect “IDENT”,0E9DEh–((TRIAL–1)*22h)
.word 0AA55h
.end

7 Memory Configurations for MSP430 Devices

The MSP430 is well suited for the development cycle. The Monitor Program provides the commands s and
c to set and clear breakpoints, and SPACE to perform a single step execution in the RAM area for these
devices.

Monitor

FFFFh

Monitor

EA00h

FFFFh

EA00h

FFFFh

Monitor

EA00h

One-Time

Programmable

EPROM

RAM

16 Bit Peripheral

Modules

8 Bit Peripheral

Modules

MSP430P325 in

MSP–STK430x320

EPROM

C000h

03FFh

RAM

0200h

16 Bit Peripheral

0100h 0100h 0100h

0000h

Modules

8 Bit Peripheral

Modules

MSP430E325 in

MSP–EVK430x320

C000h

03FFh

0200h

0000h

EPROM

RAM

16 Bit Peripheral

Modules

8 Bit Peripheral

Modules

MSP430E337 in

MSP–EVK430x330

8000h

05FFh

0200h

0000h

Figure 7–1. Memory Map of the STK/EVK

7–1

User
RAM

Address Address

3FEh

3E0h

3DEh

3DCh

RAM EPROM

RESET

User

Interrupt

Vectors

Ident. (AA55h)

FFFEh

EA00h
E9FEh

MONITOR

RESET

Program, Data

23Eh
23Dh

Programming

214h
212h

200h

MSP430P325 in

MSP–STK430x320

Figure 7–2. Memory Map of the STK/EVK430x32x

User

and Stack

Temporary

EPROM

Routine

Reserved

For

Monitor

User

Interrupt

Vectors

E9E0h

E9DEh

E9DCh

†

C000h

Ident. (AA55h)

User

Program

(– 11K)

MSP430E325 in

MSP–EVK430x320

7–2

User
RAM

Address Address

5FEh

5E0h

5DEh

5DCh

RAM EPROM

RESET

User

Interrupt

Vectors

Ident. (AA55h)

FFFEh

EA00h
E9FEh

MONITOR

RESET

Program, Data

23Eh
23Dh

Programming

214h
212h

200h

MSP430P325

MSP–EVK430x320

Figure 7–3. Memory Map of the STK/EVK430x33x

User

and Stack

Temporary

EPROM

Routine

Reserved

For

Monitor

User

Interrupt

Vectors

E9E0h
E9DEh
E9DCh

†

8000h

Ident. (AA55h)

User

Program

(– 28K)

MSP430E337

MSP–EVK430x330

7–3

7–4

Appendix A

Difference Between STK and EVK

STK EVK

Initialization banner MSP-STK430x320 MSP-EVK430x320/MSP-EVK430x330
Device One mounted OTP device

MSP430P325IPM

Monitor Programmed Programmed in only one device. After erasing the device, the

LCD Assembled Not assembled
Sensor demo Hardware assembled Hardware not included

Two windowed unbearable devices PMS430E325FZ or
PMS430E337HFD

monitor program (mon_140.txt for the MSP–EVK430x320, and
mon_160.txt for the MSP–EVK430x330) in the STK directory
must be programmed again. See Programming Adapter Manual.

A–1

A–2

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Texas Instruments:
MSP-EVK430S320 MSP-EVK430S330