Introduction to the CPU
1-3Architectural Overview
the C28x code-generation tools. For more information on operating in this
mode and migration from a C2xLP CPU, see Appendices C, D, and E.
- C27x Object-Compatible Mode: At reset, the C28x CPU operates in C27x
object-compatible mode. In this mode, the C28x is 100% object-code and
cycle-count compatible with the C27x CPU. For detailed information on
operating in C27x object-compatible mode and migrating from the C27x,
see Appendix F.
1.1.2 Switching to C28x Mode From Reset
At reset, the C28x CPU is in C27x Object-Compatible Mode (OBJMODE ==
0, AMODE == 0) and is 100% compatible with the C27x CPU. To take advan-
tage of the enhanced C28x instruction set, you must instead operate the de-
vice in C28x mode. To do this, after a reset your code must first set the OBJ-
MODE bit in ST1 by using the ”C28OBJ” (or ”SETC OBJMODE”) instruction.
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