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5.3 INSTRUCTION SET
The following paragaphs describe the set of instructions provided in the CPU32 and
demonstrate their use. Descriptions of the instruction format and the operands used by
instructions are included. After a summary of the instructions by category, a detailed
description of each instruction is listed in alphabetical order. Complete programming
information is provided, as well as a description of condition code computation and an
instruction format summary.
The CPU32 instructions include machine functions for all the following operations:
• Data Movement
• Arithmetic Operations
• Logical Operations
• Shifts and Rotates
• Bit Manipulation
• Conditionals and Branches
• System Control
The large instruction set encompasses a complete range of capabilities and, combined
with the enhanced addressing modes, provides a flexible base for program development.
5.3.1 M68000 Family Compatibility
It is the philosophy of the M68000 Family that all user-mode programs can execute
unchanged on a more advanced processor and that supervisor-mode programs and
exception handlers should require only minimal alteration.
The CPU32 can be thought of as an intermediate member of the M68000 family. Object
code from an MC68000 or MC68010 may be executed on the CPU32, and many of the
instruction and addressing mode extensions of the MC68020 are also supported.
5.3.1.1 NEW INSTRUCTIONS. Two instructions have been added to the M68000
instruction set for use in embedded control applications: LPSTOP and table lookup and
interpolation (TBL).
5.3.1.1.1 Low-Power Stop (LPSTOP). In applications where power consumption is a
consideration, the CPU32 can force the device into a low-power standby mode when
immediate processing is not required. The low-power mode is entered by executing the
LPSTOP instruction. The processor remains in this mode until a user-specified or higher
level interrupt or a reset occurs.
MOTOROLA
Freescale Semiconductor, Inc.
MC68340 USER'S MANUAL
For More Information On This Product,
Go to: www.freescale.com
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