#$0334,(A0)

Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

*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

*to perform a memory block initialization for 100 bytes.

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

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

*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

$64

number of bytes to transfer

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

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

*Initialize DMA Channel 1

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

LEA MODBASE+DMACH1,A0 Pointer to channel 1

*Initialize DMA channel 1 MCR

*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

*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.

6- 42MC68340 USER’S MANUALMOTOROLA

For More Information On This Product,

Go to: www.freescale.com

Page 291 Page 293
Page 292
Image 292
Motorola MC68340 manual Move.W
Page 291 Page 293

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.
Top Page Image Contents