8. Master Transmitter Mode | Texas Instruments MSP430x1xx specs

I2C Module Operation

Figure 15−8. Master Transmitter Mode

IDLE

I2CSTT=1

4 x I2CPSC

Generate START

I2CBUSY Is Set

8 x I2CPSC

*When I2RM=1, I2CSTP must be set before the last I2CDR value is written. Othwerwise, correct STOP generation will not occur.

I2CBB Is Set

I2CSTT Is Cleared

XA=0

8 x SCL Send Slave

Address Bits 6−0

with R/W=0

1	No Ack
	Ack

XA=1
8 x SCL	No ACK
Send Slave Address	No ACK
Bits 9−8 Extended	NACKIFG Is Set
with R/W = 0
8 x SCL
Send Slave Address	IDLE
Bits 7−0	I2CBUSY Is Cleared

Ack

I2CRM=0

Yes

			I2CNDAT
	Repeat Mode?		Number Of Bytes		STOP State?
			Sent?
	I2CRM=1		No		2
	I2CRM=1	No	No
		No	I2CDR Empty
					Yes I2CSTP=1
Yes				10 x I2CPSC
	STOP State?		I2CDR Loaded?*	10 x I2CPSC
	STOP State?		I2CDR Loaded?*
				No	Generate STOP
					No
No	Yes	8 x SCL	I2CDR Written		8 x I2CPSC
	2		Send I2CDR		I2CBB Is Cleared
	2		Low Byte
			Low Byte
			No Ack		8 x I2CPSC
		8 x SCL	Ack
		8 x SCL			I2CSTP, I2CMST
	Ack, and		Send I2CDR		I2CSTP, I2CMST
	Ack, and		Send I2CDR		Are Cleared
	I2CWORD=0		High Byte
			Ack No Ack	1	IDLE
					IDLE
					I2CBUSY Is Cleared
			New START?	New START?
					3
					Yes

USART Peripheral Interface, I2C Mode

15-9

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 8. Master Transmitter Mode

Models: MSP430x1xx

Figure 15−8. Master Transmitter Mode

IDLE

I2CSTT=1

I2CRM=1

MSP430x1xx specifications