Texas Instruments TMS320C3 Series, User Manual, Page: 80 / 166

Placing Code Sections in Memory Locations
5-16
5.7 Placing Code Sections in Memory Locations
The assembly source contains several sections that must be placed in ‘C31
memory locations, because the DSK assembler includes several new direc-
tives that control the starting address of the sections. A linker is not needed.
In the following code example, an output section named Mysect is placed be-
ginning at address 000x80 9800. The entry (execution start) point is then de-
fined at the label START. Next, a simple code loop that increments R0 is placed
into the current section.
.start ”Mysect”,0x809800 ; Mysect begins at 0x809800
.sect ”Mysect” ; Assemble code into Mysect
.entry START ; Execution START point
START LDI 0,R0 ; Initialize R0=0
LOOP ADDI 1,R0 ; Increment R0
B LOOP ; Do it again
To place two sections of code that leave a hole of unused memory, look at the
following code. The first section, Mysect, which starts at location 0x0080 9800,
is followed by a second section, jumpback,
which starts at location
0x0080 9900.
.start ”Mysect”,0x809800 ; Mysect begins at 0x809800
.sect ”Mysect” ; Assemble code into Mysect
.entry START ; Execution START point
START LDI 0,R0 ; Initialize R0=0
LOOP ADDI 1,R0 ; Increment R0
B JUMP1
;––––––––––––––––––––––––––––––
.start ”jumpback”,0x809900 ; jumpback begins at 0x809900
.sect ”jumpback” ; Assemble code into jumpback
JUMP1 ADDI 1,R0 ; Increment R0
B JUMP2
;––––––––––––––––––––––––––––––
.sect ”Mysect” ; Add more code to Mysect
JUMP2 ADDI 1,R0 ; Increment R0
B LOOP ; Finish LOOP