19.2 DAC12 Operation

DAC12 Operation

The DAC12 module is configured with user software. The setup and operation of the DAC12 is discussed in the following sections.

19.2.1 DAC12 Core

The DAC12 can be configured to operate in 8- or 12-bit mode using the DAC12RES bit. The full-scale output is programmable to be 1x or 3x the selected reference voltage via the DAC12IR bit. This feature allows the user to control the dynamic range of the DAC12. The DAC12DF bit allows the user to select between straight binary data and 2’s compliment data for the DAC. When using straight binary data format, the formula for the output voltage is given in Table 19−1.

Table 19−1.DAC12 Full-Scale Range (Vref = V eREF+ or VREF+ )

Resolution	DAC12RES	DAC12IR	Output Voltage Formula

12 bit	0	0	Vout	+ Vref	3	DAC12_xDAT
			Vout	+ Vref	3		4096
							4096
12 bit	0	1	Vout	+ Vref	DAC12_xDAT
			Vout	+ Vref		4096
						4096
8 bit	1	0	Vout	+ Vref	3	DAC12_xDAT
			Vout	+ Vref	3		256
							256
8 bit	1	1	Vout	+ Vref	DAC12_xDAT
			Vout	+ Vref		256
						256

In 8-bit mode the maximum useable value for DAC12_xDAT is 0FFh and in 12-bit mode the maximum useable value for DAC12_xDAT is 0FFFh. Values greater than these may be written to the register, but all leading bits are ignored.

DAC12 Port Selection

The DAC12 outputs are multiplexed with the port P6 pins and ADC12 analog inputs. When DAC12AMPx > 0, the DAC12 function is automatically selected for the pin, regardless of the state of the associated P6SELx and P6DIRx bits.

19-4 DAC12

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 19.2 DAC12 Operation, 19.2.1 DAC12 Core, DAC12 Port Selection

Models: MSP430x1xx