Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

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.

5.3.1.1NEW INSTRUCTIONS. Two instructions have been added to the M68000 instruction set for use in embedded control applications: LPSTOP and table lookup and interpolation (TBL).

5.3.1.1.1Low-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.

MOTOROLAMC68340 USER’S MANUAL5- 11

For More Information On This Product,

Go to: www.freescale.com

Page 147 Page 149
Page 148
Image 148
Motorola MC68340 manual Instruction SET, 1 M68000 Family Compatibility
Page 147 Page 149

MC68340 specifications

The Motorola MC68340 is a highly integrated microprocessor that was introduced in the early 1990s. It belongs to the 68000 family of microprocessors and is designed to cater to the demands of embedded systems, particularly in telecommunications and networking applications. This chip represents a significant evolution in microprocessor technology by combining a microprocessor core with additional peripherals on a single chip, making it an attractive solution for engineers looking to design compact and efficient systems.

One of the key features of the MC68340 is its 32-bit architecture, which allows for significant processing power and data handling capabilities. This architecture enables the processor to handle larger data sizes and perform more complex calculations compared to its 16-bit predecessors. The MC68340 operates at clock speeds typically ranging from 16 MHz to 25 MHz. Its dual instruction pipeline enhances throughput, allowing for simultaneous instruction fetches and executions, which significantly boosts performance.

A notable characteristic of the MC68340 is the inclusion of integrated peripherals, which help reduce the overall component count in a system. Key integrated components include a memory management unit (MMU), a direct memory access (DMA) controller, and various communication interfaces such as serial ports. The memory management capabilities enhance the processor's ability to manage memory resources efficiently, enabling it to support multitasking environments commonly found in modern computing.

In terms of connectivity, the MC68340 features connections for both synchronous and asynchronous serial communication, making it well-suited for networking tasks. The processor supports a range of bus standards, including address and data buses, which facilitate seamless interaction with peripheral devices.

Another important aspect of the MC68340 is its flexibility. The processor supports multiple operating modes, including multiple CPU configurations and compatibility with the Motorola 68000 family, allowing for easier integration into existing systems.

Moreover, the MC68340 boasts low power consumption compared to many of its contemporaries, making it an excellent choice for battery-operated applications, enhancing its appeal in sectors like telecommunications, industrial control, and automotive systems. Its combination of performance, integration, versatility, and efficiency has secured the MC68340 a reputable position in the annals of embedded systems technology, proving to be a valuable asset for developers and engineers alike.
Top Page Image Contents