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2.7.1
Display the Code
1. From the View menu, select Program Memory.
2. On the Program Memory window, select the Symbolic tab, as shown in
Figure 2-16.
FIGURE 2-16:
PROGRAM MEMORY WINDOW
3. Press <F5> to halt the processor and press <F6> to reset. The program memory
now shows a green arrow pointing to the line of code at address 0, the reset
location.
The instruction at this location is goto __reset . This code is added by the
linker to make the program branch to the start of the code in the Tut6014.s file.
The code uses the __reset label at the start of the executable code and
declares the label as global to have visibility outside the source file (see
Example 2-1).
EXAMPLE 2-1:
CODE START-UP
.global __reset
.text
__reset: mov
mov
mov
#__SP_init, W15
#__SPLIM_init, W0
W0, SPLIM
The linker also provides values for the __SP_init and __SPLIM_init
constants to initialize the stack pointer (W15), since the linker determines what
RAM is available for the stack.
? 2003 Microchip Technology Inc.
Advance Information
DS70099B-page 23
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