Table 8−2. DMA Trigger Operation

DMAxTSELx Operation

0000 A transfer is triggered when the DMAREQ bit is set. The DMAREQ bit is automatically reset when the transfer starts

0001 A transfer is triggered when the TACCR2 CCIFG flag is set. The TACCR2 CCIFG flag is automatically reset when the transfer starts. If the TACCR2 CCIE bit is set, the TACCR2 CCIFG flag will not trigger a transfer.

0010 A transfer is triggered when the TBCCR2 CCIFG flag is set. The TBCCR2 CCIFG flag is automatically reset when the transfer starts. If the TBCCR2 CCIE bit is set, the TBCCR2 CCIFG flag will not trigger a transfer.

0011 A transfer is triggered when USART0 receives new data. In I2C mode, the trigger is the data-received condition, not the RXRDYIFG flag. RXRDYIFG is not cleared when the transfer starts, and setting RXRDYIFG with software will not trigger a transfer. If RXRDYIE is set, the data received condition will not trigger a transfer. In UART or SPI mode, a transfer is triggered when the URXIFG0 flag is set. URXIFG0 is automatically reset when the transfer starts. If URXIE0 is set, the URXIFG0 flag will not trigger a transfer.

0100 A transfer is triggered when USART0 is ready to transmit new data. In I2C mode, the trigger is the transmit-ready condition, not the TXRDYIFG flag. TXRDYIFG is not cleared when the transfer starts, and setting TXRDYIFG with software will not trigger a transfer. If TXRDYIE is set, the transmit ready condition will not trigger a transfer. In UART or SPI mode, a transfer is triggered when the UTXIFG0 flag is set. UTXIFG0 is automatically reset when the transfer starts. If UTXIE0 is set, the UTXIFG0 flag will not trigger a transfer.

0101 A transfer is triggered when the DAC12_0CTL DAC12IFG flag is set. The DAC12_0CTL DAC12IFG flag is automatically cleared when the transfer starts. If the DAC12_0CTL DAC12IE bit is set, the DAC12_0CTL DAC12IFG flag will not trigger a transfer.

0110 A transfer is triggered by an ADC12IFGx flag. When single-channel conversions are performed, the corresponding ADC12IFGx is the trigger. When sequences are used, the ADC12IFGx for the last conversion in the sequence is the trigger. A transfer is triggered when the conversion is completed and the ADC12IFGx is set. Setting the ADC12IFGx with software will not trigger a transfer. All ADC12IFGx flags are automatically reset when the associated ADC12MEMx register is accessed by the DMA controller.

0111 A transfer is triggered when the TACCR0 CCIFG flag is set. The TACCR0 CCIFG flag is automatically reset when the transfer starts. If the TACCR0 CCIE bit is set, the TACCR0 CCIFG flag will not trigger a transfer.

1000 A transfer is triggered when the TBCCR0 CCIFG flag is set. The TBCCR0 CCIFG flag is automatically reset when the transfer starts. If the TBCCR0 CCIE bit is set, the TBCCR0 CCIFG flag will not trigger a transfer.

1001 A transfer is triggered when the URXIFG1 flag is set. URXIFG1 is automatically reset when the transfer starts. If URXIE1 is set, the URXIFG1 flag will not trigger a transfer.

1010 A transfer is triggered when the UTXIFG1 flag is set. UTXIFG1 is automatically reset when

the transfer starts. If UTXIE1 is set, the UTXIFG1 flag will not trigger a transfer.

1011 A transfer is triggered when the hardware multiplier is ready for a new operand.

1100 No transfer is triggered.

1101 No transfer is triggered.

1110 A transfer is triggered when the DMAxIFG flag is set. DMA0IFG triggers channel 1, DMA1IFG triggers channel 2, and DMA2IFG triggers channel 0. None of the DMAxIFG flags are automatically reset when the transfer starts.

1111 A transfer is triggered by the external trigger DMAE0.

8-13

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Texas Instruments MSP430x1xx manual 2. DMA Trigger Operation, DMAxTSELx Operation
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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.
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