Daradd EQU, Lea | Motorola MC68340 manual

Freescale Semiconductor, Inc.

*No interrupts are enabled, source (read) cycle. Increment source

*address, source size is long word, REQ is external burst request.

*Single-address mode, start the DMA transfers.

MOVE.W #$1823,DMACCR1(A0)

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

END

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

Example 2: Internal Request Generation, Memory to Memory Transfers.

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

*MC68340 basic DMA channel register initialization example code.

*This code is used to initialize the 68340's internal DMA channel

*registers, providing basic functions for operation.

*The code sets up channel 1 for internal request generation

*memory to memory transfers.

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

*SIM40 equates

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

MBAR	EQU	$0003FF00	Address of SIM40 Module Base Address Reg.
MODBASE	EQU	$FFFFF000	SIM40 MBAR address value
***************************************************************************
* DMA Channel 1 equates
DMACH1	EQU	$780	Offset from MBAR for channel 1 regs
DMAMCR1	EQU	$0	MCR for channel 1
* Channel 1 register offsets from channel 1 base address
DMAINT1	EQU	$4	interrupt register channel 1
DMACCR1	EQU	$8	control register channel 1
DMACSR1	EQU	$A	status register channel 1
DMAFCR1	EQU	$B	function code register channel 1
DMASAR1	EQU	$C	source address register channel 1
DMADAR1	EQU	$10	destination address register channel 1
DMABTC1	EQU	$14	byte transfer count register channel 1
SARADD	EQU	$6000	source address
DARADD	EQU	$8000	destination address
NUMBYTE	EQU	$E	number of bytes to transfer

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

*Initialize DMA Channel 1

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

LEA	MODBASE+DMACH1,A0 Pointer to channel 1
* Initialize DMA channel 1 MCR
6- 40	MC68340 USER’S MANUAL	MOTOROLA
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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 Daradd EQU, Lea

Models: MC68340

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

END

MBAR

MODBASE

DMACH1

DMAMCR1

DMAINT1

DMACCR1

DMACSR1

DMAFCR1

DMASAR1

DMADAR1

DMABTC1

SARADD

DARADD

EQU

NUMBYTE

LEA

MC68340 specifications