Motorola MC68340 manual

Freescale Semiconductor, Inc.

11/2/95	SECTION 1: OVERVIEW	UM Rev 1
	Freescale Semiconductor, Inc.

TABLE OF CONTENTS (Continued)

Paragraph		P a g e
Number	Title	Number
5.4.2.3	Changing Privilege Level	5-39
5.5	Exception Processing	5-39
5.5.1	Exception Vectors	5-40
5.5.1.1	Types of Exceptions	5-41
5.5.1.2	Exception Processing Sequence	5-41
5.5.1.3	Exception Stack Frame	5-42
5.5.1.4	Multiple Exceptions	5-42
5.5.2	Processing of Specific Exceptions	5-44
5.5.2.1	Reset	5-44
5.5.2.2	Bus Error	5-46
5.5.2.3	Address Error	5-46
5.5.2.4	Instruction Traps	5-47
5.5.2.5	Software Breakpoints	5-47
5.5.2.6	Hardware Breakpoints	5-48
5.5.2.7	Format Error	5-48
5.5.2.8	Illegal or Unimplemented Instructions	5-48
5.5.2.9	Privilege Violations	5-49
5.5.2.10	Tracing	5-50
5.5.2.11	Interrupts	5-51
5.5.2.12	Return from Exception	5-52
5.5.3	Fault Recovery	5-53
5.5.3.1	Types of Faults	5-55
5.5.3.1.1	Type I—Released Write Faults	5-55
5.5.3.1.2	Type II—Prefetch, Operand, RMW, and MOVEP Faults	5-56
5.5.3.1.3	Type III—Faults During MOVEM Operand Transfer	5-57
5.5.3.1.4	Type IV—Faults During Exception Processing	5-57
5.5.3.2	Correcting a Fault	5-57
5.5.3.2.1	Type I—Completing Released Writes via Software	5-57
5.5.3.2.2	Type I—Completing Released Writes via RTE	5-57
5.5.3.2.3	Type II—Correcting Faults via RTE	5-58
5.5.3.2.4	Type III—Correcting Faults via Software	5-58
5.5.3.2.5	Type III—Correcting Faults by Conversion and Restart	5-58
5.5.3.2.6	Type III—Correcting Faults via RTE	5-59
5.5.3.2.7	Type IV—Correcting Faults via Software	5-59
5.5.4	CPU32 Stack Frames	5-60
5.5.4.1	Four-Word Stack Frame	5-60
5.5.4.2	Six-Word Stack Frame	5-60
5.5.4.3	Bus Error Stack Frame	5-60
5.6	Development Support	5-63
5.6.1	CPU32 Integrated Development Support	5-63
5.6.1.1	Background Debug Mode (BDM) Overview	5-64
5.6.1.2	Deterministic Opcode Tracking Overview	5-64
MOTOROLA	MC68340 USER'S MANUAL	ix
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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.

Motorola MC68340 manual Types of Faults 3.1.1 Type I-Released Write Faults 3.1.2

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

TABLE OF CONTENTS (Continued)

5.5.3.1

Types of Faults

5.5.3.1.1

Type I—Released Write Faults

5.5.3.1.2

MC68340 specifications