SLAS191A datasheet(27/86 Pages) TI

27 / 86 page

1–21

In the HyperTerminal , 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 SPACE 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

>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.

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