Freescale Semiconductor, Inc | Motorola MC68340 guide

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System Protection Control Register (SYPCR) (Note that this register can only be written once after reset.)

•Enable the software watchdog, if desired (SWE bit).

•If the watchdog is enabled, select whether a system reset or a level 7 interrupt is desired at timeout (SWRI bit).

•If the watchdog is enabled, select the timeout period (SWTx bits).

•Enable the double bus fault monitor, if desired (DBFE bit).

•Enable the external bus monitor, if desired (BME bit).

•Select timeout period for bus monitor (BMTx bits).

Software Watchdog Interrupt Vector Register (SWIV)

•If using the software watchdog, program the vector number for a software watchdog interrupt.

Periodic Interrupt Timer Register (PITR)

•If using the software watchdog, select whether or not to prescale (SWP bit).

•If using the periodic interrupt timer, select whether or not to prescale (PTP bit).

•Program the count value for the periodic timer, or program a zero value to turn off the periodic timer (PITRx bits).

Periodic Interrupt Control Register (PICR)

•If using the periodic timer, program the desired interrupt level for the periodic interrupt timer (PIRQLx bits).

•If using the periodic timer, program the vector number for a periodic timer interrupt.

Chip Select Base Address and Address Mask Registers

•Initialize and set the V-bits in the necessary chip select base address and address mask registers. Following this step, other system resources requiring the CS≈ signals can be accessed. Care must be exercised when changing the address for CS0. The address of the instruction following the MOVE instruction to the CS0 base address register must match the value of the PC at that time. CS0 must be taken out of global chip select mode by setting the V-bit in the base address register before CS3–CS1can be used.

Port A and B Registers

•Program the desired function of the port A signals (PPARA1 and PPARA2 registers).

•Program the desired function of the port B signals (PPARB register).

MOTOROLAMC68340 USER’S MANUAL4- 37

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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 Freescale Semiconductor, Inc

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

MC68340 specifications