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Motorola MC68340 manual Freescale Semiconductor, Inc Features, Virtual Memory

Models: MC68340

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Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

5.1.1 Features

Features of the CPU32 are as follows:

•Fully Upward Object-Code Compatible with M68000 Family

•Virtual Memory Implementation

•Loop Mode of Instruction Execution

•Fast Multiply, Divide, and Shift Instructions

•Fast Bus Interface with Dynamic Bus Port Sizing

•Improved Exception Handling for Embedded Control Applications

•Additional Addressing Modes

—Scaled Index

—Address Register Indirect with Base Displacement and Index

—Expanded PC Relative Modes

—32-Bit Branch Displacements

•Instruction Set Additions

—High-Precision Multiply and Divide

—Trap On Condition Codes

—Upper and Lower Bounds Checking

•Enhanced Breakpoint Instruction

•Trace on Change of Flow

•Table Lookup and Interpolate Instruction

•LPSTOP Instruction

•Hardware BKPT Signal, Background Mode

•Fully Static Implementation

A block diagram of the CPU32 is shown in Figure 5-1. The major blocks depicted operate in a highly independent fashion that maximizes concurrences of operation while managing the essential synchronization of instruction execution and bus operation. The bus controller loads instructions from the data bus into the decode unit. The sequencer and control unit provide overall chip control, managing the internal buses, registers, and functions of the execution unit.

5.1.2 Virtual Memory

A system that supports virtual memory has a limited amount of high-speed physical memory that can be accessed directly by the processor and maintains an image of a much larger virtual memory on a secondary storage device. When the processor attempts to access a location in the virtual memory map that is not resident in physical memory, a page fault occurs. The access to that location is temporarily suspended while the necessary data is fetched from secondary storage and placed in physical memory. The

5- 2MC68340 USER’S MANUALMOTOROLA

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Page 139
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Motorola MC68340 manual Freescale Semiconductor, Inc Features, Virtual Memory
Page 138 Page 140

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.