MC68EC030FE40C Datasheet, PDF (8/36 Pages) Freescale Semiconductor, Inc – Second-Generation 32-Bit Enhanced Embedded Controller

Freescale Semiconductor, Inc.
In addition, operations on other data types, such as memory addresses, status word data, etc., are
provided in the instruction set. The coprocessor mechanism allows direct support of floating-point data
types with the MC68881/MC68882 floating-point coprocessors as well as specialized user-defined data
types and functions. The 18 addressing modes, listed in Table 1, include nine basic types:
• Register Direct
• Register Indirect
• Register Indirect with Index
• Memory Indirect
• Program Counter Indirect with Displacement
• Program Counter Indirect with Index
• Program Counter Memory Indirect
• Absolute
• Immediate
The register indirect addressing modes support postincrement, predecrement, offset, and indexing.
These capabilities are particularly useful for handling advanced data structures common to sophisticated
applications and high-level languages. The program counter relative mode also has index and offset
capabilities; this addressing mode is generally required to support position- independent software. In
addition to these addressing modes, the MC68EC030 provides data operand sizing and scaling; these
features provide performance enhancements to the programmer.
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