Overlay Pages
7-49
Linker Description
Example 7–10 defines three separate address spaces. PAGE 0 defines an
area of on-chip program memory and the rest of program memory space.
PAGE 1 defines the first overlay memory area and the rest of data memory
space. PAGE 2 defines another area of overlay memory for data space. Both
OVR_MEM ranges cover the same address range. This is possible because
each range is on a different page and therefore represents a different memory
space.
Figure 7–6 shows overlay pages defined by the MEMORY directive in
Example 7–10 and the SECTIONS directive in Example 7–11.
Figure 7–6. Overlay Pages Defined by Example 7–10 and Example 7–11
Run address
for f1, f2, f3,
f4
ONCHIP
PROG
.text
800h
FC00h
2C00h
Program Memory
Page 0
f1.obj (.text)
f2.obj (.text)
OVR_MEM
DATA
.bss
A00h
2C00h
f3.obj (.text)
f4.obj (.text)
OVR_MEM
A00h
2C00h
Data Memory
Page 1
Data Memory
Page 2
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