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Motorola MC68340 manual Multidrop Mode, Looping Modes Functional Diagram

Models: MC68340

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Freescale Semiconductor, Inc.

Semiconductor, Inc.

CPU

CPU

CPU

DISABLED

DISABLED

DISABLED

 

Rx

 

RxDx

 

 

 

INPUT

 

 

DISABLED

TxDx

 

 

 

Tx

 

 

OUTPUT

 

 

 

 

 

 

 

(a) Automatic Echo

Rx

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RxDx

 

INPUT

 

 

 

DISABLED

TxDx

 

Tx

 

OUTPUT

 

 

 

 

 

(b) Local Loopback

Rx

DISABLED

RxDx

 

 

INPUT

Tx

DISABLED

TxDx

 

OUTPUT

 

 

(c) Remote Loopback

Freescale

Figure 7-7. Looping Modes Functional Diagram

7.3.4 Multidrop Mode

A channel can be programmed to operate in a wakeup mode for multidrop or multiprocessor applications. Functional timing information for the multidrop mode is shown in Figure 7-8. The mode is selected by setting bits 3 and 4 in mode register 1 (MR1). This mode of operation allows the master station to be connected to several slave stations (maximum of 256). In this mode, the master transmits an address character followed by a block of data characters targeted for one of the slave stations. The slave stations have their channel receivers disabled. However, they continuously monitor the data stream sent out by the master station. When an address character is sent by the master, the slave receiver channel notifies its respective CPU by setting the RxRDY bit in the SR and generating an interrupt (if programmed to do so). Each slave station CPU then compares the received address to its station address and enables its receiver if it wishes to receive the subsequent data characters or block of data from the master station. Slave stations not addressed continue to monitor the data stream for the next address character. Data fields in the data stream are separated by an address character. After a slave receives a block of data, the slave station's CPU disables the receiver and initiates the process again.

MOTOROLAMC68340 USER’S MANUAL7- 15

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Motorola MC68340 manual Multidrop Mode, Looping Modes Functional Diagram
Page 309 Page 311

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.