Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.

ADDRESS

FC

 

 

 

 

CH1

CH2

 

15

8

7

0

780

7A0

S

 

MODULE CONFIGURATION REGISTER (MCR)

 

782

7A2

S

 

RESERVED

 

784

7A4

S

 

INTERRUPT REGISTER

 

786

7A6

S/U

 

RESERVED

 

788

7A8

S/U

 

CHANNEL CONTROL REGISTER

 

78A

7AA

S/U

CHANNEL STATUS REGISTER

FUNCTION CODE REGISTER

78C

7AC

S/U

 

SOURCE ADDRESS REGISTER MSBs

 

78E

7AE

S/U

 

SOURCE ADDRESS REGISTER LSBs

 

790

7B0

S/U

 

DESTINATION ADDRESS REGISTER MSBs

 

792

7B2

S/U

 

DESTINATION ADDRESS REGISTER LSBs

 

794

7B4

S/U

 

BYTE TRANSFER COUNTER MSBs

 

796

7B6

S/U

 

BYTE TRANSFER COUNTER LSBs

 

798

7B8

S/U

 

RESERVED

 

79A

7BA

S/U

 

RESERVED

 

79C

7BC

S/U

 

RESERVED

 

79E

7BE

S/U

 

RESERVED

 

Figure 6-15. DMA Module Programming Model

In the registers discussed in the following paragraphs, the numbers in the upper right- hand corner indicate the offset of the register from the base address specified by the module base address register (MBAR) in the SIM40. The first number is the offset for channel 1; the second number is the offset for channel 2. The numbers above the register represent the bit position in the register. The register contains the mnemonic for the bit. The value of these bits after a hardware reset is shown below the register. The access privilege is shown in the lower right-hand corner.

NOTE

A CPU32 RESET instruction will not affect the MCR but will reset all other registers in the DMA module as though a hardware reset occurred. The term DMA is used to reference either channel 1 or channel 2, since the two are functionally equivalent.

6.7.1 Module Configuration Register (MCR)

The MCR controls the DMA channel configuration. Each DMA channel has an MCR. This register can be either read or written when the channel is enabled and is in the supervisor state. The MCR is not affected by a CPU32 RESET instruction.

MOTOROLAMC68340 USER’S MANUAL6- 23

For More Information On This Product,

Go to: www.freescale.com

Page 272 Page 274
Page 273
Image 273
Motorola MC68340 manual Module Configuration Register MCR, DMA Module Programming Model
Page 272 Page 274

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