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MPLAB ? C32 C Compiler User’s Guide
The C standard requires that the uninitialized data sections be initialized to 0 on startup.
In order to initialize these sections, the linker script must allocate these sections
contiguously and initialize two variables – one for the start address of the uninitialized
data section and one for the end address of the uninitialized data section. The startup
code clears all data memory locations between these two addresses. These variables
are named _bss_begin and _bss_end , respectively.
FIGURE 5-6:
UNINITIALIZED DATA
5.7.2.6
COPY INITIALIZED DATA FROM PROGRAM FLASH TO DATA MEMORY
Similar to uninitialized data sections, four initialized data sections exist: .sdata ,
.data , .lit4 , and .lit8 . The .sdata section is a data segment containing
initialized variables less than or equal to n bytes where n is determined by the -G n
command line option. The .data section is a data segment containing initialized
variables not included in .sdata . The .lit4 and .lit8 sections contain constants
(usually floating-point) which the assembler decides to store in memory rather than in
the instruction stream.
On startup, a copy of the initialized data exists in the program flash. This data must be
copied to data memory. To facilitate this, the linker script must initialize three
variables—one for the start address of the image in program flash, one for the start
address of the section in data memory, and one for the end address of the section in
data memory. The startup code copies all data memory locations from program flash
image to data memory using these variables. These variables are named
_data_image_begin , _data_begin , and _data_end , respectively.
DS51686A-page 64
? 2007 Microchip Technology Inc.
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SW300003-EVAL
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SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
SY87729LHI-EVAL
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