Continuous Transfer

ADC10 Operation

A continuous transfer is selected if ADC10CT bit is set. The DTC will not stop after block one in (one-block mode) or block two (two-block mode) has been transferred. The internal address pointer and transfer counter are set equal to ADC10SA and n respectively. Transfers continue starting in block one. If the ADC10CT bit is reset, DTC transfers cease after the current completion of transfers into block one (in the one-block mode) or block two (in the two-block mode) have been transfer.

DTC Transfer Cycle Time

For each ADC10MEM transfer, the DTC requires one or two MCLK clock cycles to synchronize, one for the actual transfer (while the CPU is halted), and one cycle of wait time. Because the DTC uses MCLK, the DTC cycle time is dependent on the MSP430 operating mode and clock system setup.

If the MCLK source is active, but the CPU is off, the DTC uses the MCLK source for each transfer, without re-enabling the CPU. If the MCLK source is off, the DTC temporarily restarts MCLK, sourced with DCOCLK, only during a transfer. The CPU remains off and after the DTC transfer, MCLK is again turned off. The maximum DTC cycle time for all operating modes is show in Table 18−2.

Table 18−2.Maximum DTC Cycle Time

CPU Operating Mode	Clock Source	Maximum DTC Cycle Time

Active mode	MCLK=DCOCLK	3 MCLK cycles
Active mode	MCLK=LFXT1CLK	3 MCLK cycles
Low-power mode LPM0/1	MCLK=DCOCLK	4 MCLK cycles
Low-power mode LPM3/4	MCLK=DCOCLK	4 MCLK cycles + 6 ∝s†
Low-power mode LPM0/1	MCLK=LFXT1CLK	4 MCLK cycles
Low-power mode LPM3	MCLK=LFXT1CLK	4 MCLK cycles
Low-power mode LPM4	MCLK=LFXT1CLK	4 MCLK cycles + 6 ∝s†

†The additional 6 ∝s are needed to start the DCOCLK. It is the t(LPMx) parameter in the datasheet.

18-20 ADC10

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.

Texas Instruments MSP430x1xx manual Continuous Transfer, DTC Transfer Cycle Time

Models: MSP430x1xx