System Configuration and Protection Operation

Freescale Semiconductor, Inc.

Inc.

MBAR ($0003FF00

FC=0111)

MC68340

RELOCATABLE

MODULE

BLOCK

RAM (TYPICAL)

$FFFFFFFF

$XXXXXFFF

$XXXXX000

$00000000

DMA

SERIAL PORTS

TIMER MODULES

SIM 40

$FFF

$7BF

$780 $721

$. 700

$67F

$600

$07F

$000

Freescale Semiconductor,

NOTE: $XXXXX is the value contained in the MBAR bits BA31-BA12.

Figure 4-1. SIM40 Module Register Block

4.2.2 System Configuration and Protection Operation

The SIM40 allows the user to control certain features of system configuration by writing bits in the module configuration register (MCR). This register also contains read-only status bits that show the state of the SIM40.

All M68000 family members are designed to provide maximum system safeguards. As an extension of the family, the MC68340 promotes the same basic concepts of safeguarded design present in all M68000 members. In addition, many functions that normally must be provided by external circuits are incorporated in this device. The following features are provided in the system configuration and protection function:

SIM40 Module Configuration

The SIM40 allows the user to configure the system to the particular requirements. The functions include control of FREEZE and show cycle operation, the function of the CS≈ signals, the access privilege of the supervisor/user registers, the level of interrupt arbitration, and automatic vectoring for external interrupts.

Reset Status

The reset status register provides the user with information on the cause of the most recent reset. The possible causes of reset include: external, power-up, software watchdog, double bus fault, loss of clock, and RESET instruction.

MOTOROLAMC68340 USER’S MANUAL4- 3

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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 System Configuration and Protection Operation, SIM40 Module Register Block

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor,

Figure 4-1. SIM40 Module Register Block

4.2.2 System Configuration and Protection Operation

MC68340 specifications