System Configuration and Protection Function

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MODULE

CONFIGURATION

RESET

STATUS

DOUBLE BUS FAULT MONITOR

BUS

MONITOR

SPURIOUS

INTERRUPT MONITOR

HALT

RESET REQUEST

BERR

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CLOCK

SOFTWARE

RESET

WATCHDOG

REQUEST or

2 9

IRQ7

PRESCALER

PERIODIC

IRQ7-IRQ1

INTERRUPT TIMER

Figure 4-2. System Configuration and Protection Function

4.2.2.1SYSTEM CONFIGURATION. Aspects of the system configuration are controlled by the MCR and the autovector register (AVR).

The configuration of port B is controlled by the combination of the FIRQ bit in the MCR and the port B pin assignment register (PPARB). Port B pins can function as dedicated I/O lines, chip selects, interrupts, or autovector input.

For debug purposes, internal bus accesses can be shown on the external bus. This function is called show cycles. The SHEN1, SHEN0 bits in the MCR control show cycles. Bus arbitration can be either enabled or disabled during show cycles.

Arbitration for servicing interrupts is controlled by the value programmed into the interrupt arbitration (IARB) field of the MCR. Each module that generates interrupts, including the SIM40, has an IARB field. The value of the IARB field allows arbitration during an IACK cycle among modules that simultaneously generate the same interrupt level. No two modules should share the same IARB value. The IARB must contain a value other than $0 for all modules that can generate interrupts; interrupts with IARB = 0 are discarded as extraneous. The SIM40 arbitrates for both its own interrupts and externally generated interrupts.

MOTOROLAMC68340 USER’S MANUAL4- 5

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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 Function

Models: MC68340

Freescale Semiconductor, Inc.

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Figure 4-2. System Configuration and Protection Function

MC68340 specifications