1. Usart Block Diagram SPI Mode | Texas Instruments MSP430x1xx

USART Introduction: SPI Mode

Figure 14−1. USART Block Diagram: SPI Mode

		SWRST USPIEx*			URXEIE URXWIE
										SYNC= 1
						URXIFGx*
FE PE OE BRK				Receive Control
FE PE OE BRK
Receive Status				Receiver Buffer UxRXBUF			LISTEN	MM	SYNC
							LISTEN	MM	SYNC
							0	1	1
RXERR	RXWAKE			Receiver Shift Register					1	SOMI
RXERR	RXWAKE			Receiver Shift Register						SOMI
							1	0	0
									0
		SSEL1 SSEL0	SP	CHAR	PEV	PENA			1	URXD
		SSEL1 SSEL0	SP	CHAR	PEV	PENA				URXD
				Baud−Rate Generator		UCLKS			0
UCLKI		00							0
UCLKI		00								STE
ACLK		01								STE
ACLK		01
SMCLK		10		Prescaler/Divider UxBRx
SMCLK		10
SMCLK		11		Modulator UxMCTL						UTXD
				Modulator UxMCTL

			SP	CHAR	PEV	PENA
		WUT		Transmit Shift Register				1	1
		WUT		Transmit Shift Register					1	SIMO
										SIMO
								0	0
		TXWAKE		Transmit Buffer UxTXBUF					0
		TXWAKE		Transmit Buffer UxTXBUF

UTXIFGx*

Transmit Control

SYNC CKPH CKPL

SWRST USPIEx* TXEPT

STC

UCLK

UCLKI

Clock Phase and Polarity

* Refer to the device-specific datasheet for SFR locations

USART Peripheral Interface, SPI Mode

14-3

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 1. Usart Block Diagram SPI Mode

Models: MSP430x1xx

Figure 14−1. USART Block Diagram: SPI Mode

MSP430x1xx specifications