Instruction Set; M68000 Family Compatibility; New Instructions; Low-Power Stop (Lpstop) - Motorola CPU32 Reference Manual

This section describes the set of instructions provided in the CPU32 and demonstrates
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 for-
mat 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, com-
bined with the enhanced addressing modes, provides a flexible base for program de-
velopment.

4.1 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. Ob-
ject 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 support-
ed.

4.1.1 New Instructions

Two instructions have been added to the M68000 instruction set for use in controller
applications. These are the low-power stop (LPSTOP) and the table lookup and inter-
polation (TBL) commands.

4.1.1.1 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.
CPU32
REFERENCE MANUAL
SECTION 4

INSTRUCTION SET

INSTRUCTION SET MOTOROLA
4-1