USART Operation: SPI Mode

Receive Enable

The SPI receive enable state diagrams are shown in Figure 14−6 and Figure 14−7. When USPIEx = 0, UCLK is disabled from shifting data into the RX shift register.

Figure 14−6. SPI Master Receive-Enable State Diagram

USPIEx = 0

 

No Data Written

Not Completed

 

to UxTXBUF

 

 

 

 

 

 

USPIEx = 1

Idle State

USPIEx = 1

Receiver

 

Receive

Handle Interrupt

(Receiver

 

Collects

Disable

 

Conditions

Enabled)

Data Written

Character

USPIEx = 0

 

 

to UxTXBUF

 

 

 

 

 

 

 

 

 

 

Character

SWRST

 

USPIEx = 1

Received

PUC

 

 

USPIEx = 0

Figure 14−7. SPI Slave Receive-Enable State Diagram

USPIEx = 0

 

No Clock at UCLK

Not Completed

 

 

 

 

 

USPIEx = 1

Idle State

USPIEx = 1

Receiver

 

Receive

Handle Interrupt

(Receive

 

Collects

Disable

External Clock

Conditions

Enabled)

Character

USPIEx = 0

 

 

Present

 

 

 

 

 

 

Character

SWRST

 

USPIEx = 1

 

Received

PUC

USPIEx = 0

14-8USART Peripheral Interface, SPI Mode

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Texas Instruments MSP430x1xx manual Receive Enable, 6. SPI Master Receive-Enable State Diagram
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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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