9. Master Receiver Mode | Texas Instruments MSP430x1xx guide

I2C Module Operation

Figure 15−9. Master Receiver Mode

IDLE

	I2CSTT=1		2
	I2CSTT=1
	4 x I2CPSC
	Generate START
	8 x I2CPSC
	I2CBB Is Set
	I2CSTT Is Cleared
		XA = 1
		8 x SCL
		Send Slave Address
		Bits 9−8 Extended
	XA = 0		With R/W = 0
	XA = 0
		8 x SCL
		Send Slave Address
			Bits 7−0
	4 x I2CPSC
		Generate 2nd START
8 x SCL		8 x SCL
	Send Slave	Send Slave Address
	Address Bits 6−0	Bits 9−8 Extended
	with R/W = 1		With R/W = 1
	Ack	Ack
1	No Ack
	8 x SCL
	Receive Data		3
	Low Byte		3
	Low Byte
	1 x SCL		No
No	Generate Ack
No	For Low Byte			No
	For Low Byte

	8 x SCL		Or
	8 x SCL
	Receive Data		3
	High Byte		3
	High Byte
	I2CWORD=0
	1 x SCL
	Generate Ack
	For High Byte

New START?

Yes

New START?

No Ack

NACKIFG Is Set

		No
	IDLE	3
	IDLE
I2CBUSY Is Cleared
No
I2CRM=0		Repeat Mode?
I2CNDAT		I2CRM=1
Number Of Bytes
Received?
Yes		STOP State?
Yes
STOP State?		Yes, I2CSTP=1
STOP State?	10 x I2CPSC
	10 x I2CPSC
		Generate STOP
No	8 x I2CPSC
	8 x I2CPSC
		I2CBB Is Cleared
New START?	8 x I2CPSC
		I2CSTP, I2CMST
		Are Cleared

Yes

IDLE

I2CBUSY Is Cleared

15-10USART Peripheral Interface, I2C Mode

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 9. Master Receiver Mode

Models: MSP430x1xx

Figure 15−9. Master Receiver Mode

IDLE

I2CNDAT

I2CRM=1

MSP430x1xx specifications