Freescale Semiconductor, Inc | Motorola MC68340 specification

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•Select the direction of transfer if in single-address mode (ECO bit), or select which device generates requests if in dual-address mode.

6.9.1.1DMA CHANNEL OPERATION IN SINGLE-ADDRESS MODE. The following steps are required to begin a DMA transfer in single-address mode.

Channel Control Register (CCR)

•Write a zero to the start bit (STR) to prevent the channel from starting the transfer prematurely.

•Select the amount by which to increment the source address for a read cycle (SAPI bit) or the destination address for a write cycle (DAPI bit).

•Define the transfer size by selecting the source size for a read cycle (SSIZE field) or by selecting the destination size for a write cycle (DSIZE field).

•Select external burst request mode or external cycle steal request mode (REQ field).

•Set the S/D bit for signal-address transfer.

Channel Status Register (CSR)

•Clear the CSR by writing $7C into it. The DMA cannot be started until the DONE, BES, BED, CONF, and BRKP bits are cleared.

Function Code Register (FCR)

•Encode the source function code for a read cycle or the destination function code for a write cycle.

Address Register (SAR or DAR)

• Write the source address for a read cycle or the destination address for a write cycle.

Byte Transfer Counter (BTC)

• Encode the number of bytes to be transferred.

Channel Control Register (CCR)

• Write a one to the start bit (STR) to allow the transfer to begin.

6.9.1.2DMA CHANNEL OPERATION IN DUAL-ADDRESS MODE. The following steps are required to begin a DMA transfer in dual-address mode.

Channel Control Register (CCR)

•Write a zero to the start bit (STR) to prevent the channel from starting the transfer prematurely.

•Select the amount by which to increment the source and destination addresses (SAPI and DAPI bits).

•Select the source and destination sizes (SSIZE and DSIZE fields).

•Select internal request, external burst request mode, or external cycle steal request mode (REQ field).

MOTOROLAMC68340 USER’S MANUAL6- 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.

MOTOROLAMC68340 USER’S MANUAL6- 37

MC68340 specifications