MOVE.B #$DD,DMAFCR1A0, MOVE.L DARADD,DMADAR1A0

Freescale Semiconductor, Inc.

*Normal Operation, ignore FREEZE, dual-address mode. ISM field at 3. Make

*sure CPU32 SR I2-I0 bits are less than or equal to ISM bits for channel startup.

*Supervisor/user reg. unrestricted, MAID field at 3. IARB priority at 4.

MOVE.W #$0334,(A0)

*Clear channel control reg.

*Clear STR (start) bit to prevent the channel from starting a transfer early.

CLR.W DMACCR1(A0)

*Initialize interrupt reg.

*Interrupt priority at 7, interrupt vector at $42.

MOVE.W #$0742,DMAINT1(A0)

*Initialize channel status reg.

*Clear the DONE, BES, BED, CONF and BRKP bits to allow channel to startup.

MOVE.B #$7C,DMACSR1(A0)

*Initialize function code reg.

*DMA space, supervisor data space for source and destination.

MOVE.B #$DD,DMAFCR1(A0)

*Initialize source operand address

*Source address is equal to $6000.

MOVE.L SARADD,DMASAR1(A0)

*Initialize destination operand address

*Destination address is equal to $8000.

MOVE.L DARADD,DMADAR1(A0)

*Initialize the byte transfer count reg.

*The number of bytes to be transferred is $E or 7 words

MOVE.L NUMBYTE,DMABTC1(A0)

*Channel control reg. init. and Start DMA transfers

*No interrupts are enabled, destination (write) cycle. Increment source and

*destination addresses,source size is word, destination size is word.

*REQ is internal. 100% of bus bandwidth, dual-address transfers,

*start the DMA transfers.

MOVE.W #$0E8D,DMACCR1(A0)

***************************************************************************

END

***************************************************************************

Example 3: Internal Request Generation, Memory Block Initialization.

***************************************************************************

* MC68340 basic DMA channel register initialization example code.

MOTOROLAMC68340 USER’S MANUAL6- 41

For More Information On This Product,

Go to: www.freescale.com

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 MOVE.B #$DD,DMAFCR1A0, MOVE.L DARADD,DMADAR1A0, MOVE.W #$0E8D,DMACCR1A0 END

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

CLR.W DMACCR1(A0)

MOVE.B #$7C,DMACSR1(A0)

MOVE.B #$DD,DMAFCR1(A0)

MOVE.L SARADD,DMASAR1(A0)

MOVE.L DARADD,DMADAR1(A0)

MOVE.L NUMBYTE,DMABTC1(A0)

MOVE.W #$0E8D,DMACCR1(A0)

END

MOTOROLAMC68340 USER’S MANUAL6- 41

MC68340 specifications