Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

The primary features of the MC68340, illustrated in Figure 1-1, are as follows:

•High Functional Integration on a Single Piece of Silicon

•CPU32—MC68020-Derived 32-Bit Central Processor Unit

—Upward Object-Code Compatible with MC68000 and MC68010

—Additional MC68020 Instructions and Addressing Modes

—Unique Embedded Control Instructions

—Fast Two-Clock Register Instructions—10,045 Dhrystones

•Two-Channel Low-Latency DMA Controller for High-Speed Memory Transfers

—Single- or Dual-Address Transfers

—32-Bit Addresses and Counters

—8-, 16-, and 32-Bit Data Transfers

—50 Mbyte/Sec Sustained Transfers (12.5 Mbyte/Sec Memory-to-Memory)

•Two-Channel Universal Synchronous/Asynchronous Receiver/Transmitter (USART)

—Baud Rate Generators

—Modem Control

—MC68681/MC2681 Compatible

—9.8 Mbits/Sec Maximum Transfer Rate

•Two Independent Counter/Timers

—16-Bit Counter

—Up to 8-Bit Prescaler

—Multimode Operation

—80-ns Resolution

•System Integration Module Incorporates Many Functions Typically Relegated to External PALs, TTL, and ASIC, such as:

— System Configuration

— External Bus Interface

— System Protection

— Periodic Interrupt Timer

— Chip Select and Wait State Generation — Interrupt Response

— Clock Generation

— Bus Arbitration

— Dynamic Bus Sizing

— IEEE 1149.1 Boundary Scan (JTAG)

— Up to 16 Discrete I/O Lines

— Power-On Reset

•32 Address Lines, 16 Data Lines

•Power Consumption Control

—Static HCMOS Technology Reduces Power in Normal Operation

—Low Voltage Operation at 3.3 V ±0.3 V (MC68340V only)

—Programmable Clock Generator Throttles Frequency

—Unused Peripherals Can Be Turned Off

—LPSTOP Provides an Idle State for Lowest Standby Current

•0–16.78 MHz or 0–25.16 MHz Operation

•144-Pin Ceramic Quad Flat Pack (CQFP) or 145-Pin Plastic Pin Grid Array (PGA)

As a low voltage part, the MC68340V can operate with a 3.3-V power supply. MC68340 is used throughout this manual to refer to both the low voltage and standard 5-V parts since both are functionally equivalent.

1.1 M68300 FAMILY

The MC68340 is one of a series of components in the M68300 family. Other members of the family include the MC68302, MC68330, MC68331, MC68332, and MC68333.

1- 2MC68340 USER’S MANUALMOTOROLA

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Motorola MC68340 manual M68300 Family
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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.
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