Manuals / Texas Instruments / Computer Equipment / Computer Hardware

Texas Instruments MSP430x1xx manual 1. DMA Transfer Modes, DMADTx Transfer Description Mode

Models: MSP430x1xx

1 432
Download 432 pages 41.81 Kb
Page 173
Image 173

8.2.2DMA Transfer Modes

The DMA controller has six transfer modes selected by the DMADTx bits as listed in Table 8−1. Each channel is individually configurable for its transfer mode. For example, channel 0 may be configured in single transfer mode, while channel 1 is configured for burst-block transfer mode, and channel 2 operates in repeated block mode. The transfer mode is configured independently from the addressing mode. Any addressing mode can be used with any transfer mode.

Table 8−1. DMA Transfer Modes

DMADTx

Transfer

Description

 

Mode

 

 

 

 

000

Single transfer

Each transfer requires a trigger. DMAEN is

 

 

automatically cleared when DMAxSZ transfers have

 

 

been made.

001

Block transfer

A complete block is transferred with one trigger.

 

 

DMAEN is automatically cleared at the end of the

 

 

block transfer.

010, 011

Burst-block

CPU activity is interleaved with a block transfer.

 

transfer

DMAEN is automatically cleared at the end of the

 

 

burst-block transfer.

100Repeated single transfer

101Repeated block transfer

110, 111 Repeated burst-block transfer

Each transfer requires a trigger. DMAEN remains enabled.

A complete block is transferred with one trigger. DMAEN remains enabled.

CPU activity is interleaved with a block transfer. DMAEN remains enabled.

8-5

Page 172 Page 174
Page 173
Image 173
Texas Instruments MSP430x1xx manual 1. DMA Transfer Modes, DMADTx Transfer Description Mode
Page 172 Page 174

MSP430x1xx specifications

The Texas Instruments MSP430x1xx series is a family of ultra-low-power microcontrollers that are highly regarded in the embedded systems community for their versatility and performance. Designed for applications ranging from portable instrumentation to low-power industrial devices, the MSP430x1xx combines flexibility and efficiency with advanced features tailored for energy-sensitive applications.

One of the standout characteristics of the MSP430x1xx is its ultra-low-power operation. This series offers several low-power modes that can significantly extend battery life in portable devices. The microcontroller can be in active mode, low-power mode, or even in a deep sleep state, allowing developers to optimize power consumption based on the application's requirements. In fact, some configurations can operate at just a few microamps, making it ideal for battery-operated devices.

Another key feature is the 16-bit RISC architecture that provides powerful processing capabilities while maintaining a low power profile. The MSP430x1xx series supports a maximum clock speed of 16 MHz, allowing for efficient task execution while consuming minimal energy. This architecture ensures that programs run smoothly while the microcontroller remains energy efficient.

The MSP430x1xx is equipped with various integrated peripherals, including analog-to-digital converters (ADCs), timers, and communication interfaces like UART, SPI, and I2C. The inclusion of a powerful ADC enables the microcontroller to handle sensor readings with high accuracy, making it suitable for applications like environmental monitoring and medical devices. The integrated timers provide essential functionality for real-time applications, allowing for event-driven programming and precise timing control.

Memory options in the MSP430x1xx series are also robust, with configurations offering flash memory sizes from 1 KB to 64 KB. This flexibility allows developers to choose the optimal memory size for their specific applications, accommodating a wide range of requirements.

Additionally, the MSP430x1xx microcontrollers are designed with a wide operating voltage range, typically from 1.8V to 3.6V, making them compatible with various power sources and further enhancing their usability in diverse applications.

In summary, the Texas Instruments MSP430x1xx series of microcontrollers is an excellent choice for developers seeking low-power, high-performance solutions for embedded applications. With an efficient architecture, a rich set of peripherals, and flexible memory options, these microcontrollers are positioned to meet the growing demands of modern electronic designs, particularly in battery-powered and energy-sensitive applications.