MC68340 datasheet(148/441 Pages) FREESCALE

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MOTOROLA

MC68340 USER’S MANUAL

5- 11

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.

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