Texas Instruments MSP430x1xx manual

Flash Memory Registers

FCTL3, Flash Memory Control Register FCTL3

FWKEYx, Read as 096h Must be written as 0A5h

Reserved

EMEX

LOCK

WAIT

ACCVIFG

KEYV

BUSY

rw-0

rw-1

r-1

rw−0

rw-(0)

r(w)−0

FWKEYx	Bits	FCTLx password. Always read as 096h. Must be written as 0A5h or a PUC
	15-8	will be generated.
Reserved	Bits	Reserved. Always read as 0.
	7-6
EMEX	Bit 5	Emergency exit
		0	No emergency exit
		1	Emergency exit
LOCK	Bit 4	Lock. This bit unlocks the flash memory for writing or erasing. The LOCK bit
		can be set anytime during a byte/word write or erase operation and the
		operation will complete normally. In the block write mode if the LOCK bit is set
		while BLKWRT=WAIT=1, then BLKWRT and WAIT are reset and the mode
		ends normally.
		0	Unlocked
		1	Locked
WAIT	Bit 3	Wait. Indicates the flash memory is being written to.
		0	The flash memory is not ready for the next byte/word write
		1	The flash memory is ready for the next byte/word write
ACCVIFG	Bit 2	Access violation interrupt flag
		0	No interrupt pending
		1	Interrupt pending
KEYV	Bit 1	Flash security key violation. This bit indicates an incorrect FCTLx password
		was written to any flash control register and generates a PUC when set. KEYV
		must be reset with software.
		0	FCTLx password was written correctly
		1	FCTLx password was written incorrectly
BUSY	Bit 0	Busy. This bit indicates the status of the flash timing generator.
		0	Not Busy
		1	Busy

5-20	Flash Memory Controller

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 FCTL3, Flash Memory Control Register FCTL3

Models: MSP430x1xx

FCTL3, Flash Memory Control Register FCTL3

FWKEYx

Reserved

WAIT

MSP430x1xx specifications