Rabbit 2000 - Page 24

22 Rabbit 2000 Microprocessor
Dynamic C defines macros that include information about compiling to RAM or flash and
identifying memory device types, memory sizes, and board type. The origin setup shown
above differs from that included in the standard BIOS included with Dynamic C as the
standard BIOS uses additional macros values for dealing with a wider range of boards and
memory device types.
5.5.1 Origin Directives in Program Code
In order to either place programs in different places in root memory, or in order to compile
a boot strapping program such as a pilot BIOS or coldloader, origin statements may be
used in the user’s program code.
For example, the first line of a pilot BIOS program, pilot.c, would be
#rcodorg rootcode 0x0 0x0 0x6000 apply
A program with such an origin directive could only be compiled to a BIN file, because
compiling it to the target would overwrite the running BIOS.
xmemcode
stack
rootdata
rootcode
Logical Address Space
Physical Address Space
watcode/watdata
0000
6000
C
5FF
CDFF
FFFF
E
000
0x00000
0x06000
0x20000
0x9700
0
0x9DDF
F
0xFFFF
F
rootcode
xmemcode
rootdata
watcode
watdata