Operation, Baud Rate Generator | Motorola MC68340 specs

Freescale Semiconductor, Inc.

7.3 OPERATION

The following paragraphs describe the operation of the baud rate generator, transmitter and receiver, and other functional operating modes of the serial module.

7.3.1 Baud Rate Generator

The baud rate generator consists of a crystal oscillator, baud rate generator, and clock selectors (see Figure 7-3). The crystal oscillator operates directly from a 3.6864-MHz crystal or from an external clock of the same frequency. The SCLK input bypasses the baud rate generator and provides a synchronous clock mode of operation when used as a divide-by-1 clock and an asynchronous clock mode when used as a divide-by-16 clock. The clock is selected by programming the clock-select register (CSR) for each channel.

Semiconductor, Inc.

BAUD RATE

GENERATOR LOGIC

CRYSTAL

OSCILLATOR

BAUD RATE

GENERATOR

CLOCK

SELECTORS

EXTERNAL

INTERFACE..... ..... .... .

SCLK

Freescale

Figure 7-3. Baud Rate Generator Block Diagram

7.3.2 Transmitter and Receiver Operating Modes

The functional block diagram of the transmitter and receiver, including command and operating registers, is shown in Figure 7-4. The paragraphs that follow contain descriptions for both these functions in reference to this diagram. For detailed register information, refer to 7.4 Register Description and Programming.

7- 8MC68340 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.

Motorola MC68340 manual Operation, Baud Rate Generator, Transmitter and Receiver Operating Modes

Models: MC68340