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Motorola manual 18MC68340 USER’S Manualmotorola

Models: MC68340

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Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

NOTE

All serial module registers are only accessible as bytes. The contents of the mode registers (MR1 and MR2), clock-select register (CSR), and the auxiliary control register (ACR) bit 7 should only be changed after the receiver/transmitter is issued a software RESET command—i.e., channel operation must be disabled. Care should also be taken if the register contents are changed during receiver/transmitter operations, as undesirable results may be produced.

In the registers discussed in the following pages, the numbers in the upper right-hand corner indicate the offset of the register from the base address specified in the module base address register (MBAR) in the SIM40. The numbers above the register description represent the bit position in the register. The register description contains the mnemonic for the bit. The values shown below the register description are the values of those register bits after a hardware reset. A value of U indicates that the bit value is unaffected by reset. The read/write status and the access privilege are shown in the last line.

NOTE

A CPU32 RESET instruction will not affect the MCR, but will reset all the other serial module registers as though a hardware reset had occurred. The module is enabled when the STP bit in the MCR is cleared. The module is disabled when the STP bit in the MCR is set.

7- 18MC68340 USER’S MANUALMOTOROLA

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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.