Texas Instruments MSP430x1xx guide

Flash Memory Operation

In byte/word mode, the internally-generated programming voltage is applied to the complete 64-byte block, each time a byte or word is written, for 32 of the 35 fFTG cycles. With each byte or word write, the amount of time the block is subjected to the programming voltage accumulates. The cumulative programming time, tCPT, must not be exceeded for any block. If the cumulative programming time is met, the block must be erased before performing any further writes to any address within the block. See the device-specific datasheet for specifications.

Initiating a Byte/Word Write from Within Flash Memory

The flow to initiate a byte/word write from flash is shown in Figure 5−8.

Figure 5−8. Initiating a Byte/Word Write from Flash

Disable all interrupts and watchdog

Setup flash controller and set WRT=1

Write byte or word

Set WRT=0, LOCK=1, re-enable interrupts and watchdog

;Byte/word write from flash. 514 kHz < SMCLK < 952 kHz

;Assumes 0FF1Eh is already erased

;Assumes ACCVIE = NMIIE = OFIE = 0.

MOV	#WDTPW+WDTHOLD,&WDTCTL	; Disable WDT
DINT		; Disable interrupts
MOV	#FWKEY+FSSEL1+FN0,&FCTL2	; SMCLK/2
MOV	#FWKEY,&FCTL3	; Clear LOCK
MOV	#FWKEY+WRT,&FCTL1	; Enable write
MOV	#0123h,&0FF1Eh	; 0123h	−> 0FF1Eh
MOV	#FWKEY,&FCTL1	; Done. Clear WRT
MOV	#FWKEY+LOCK,&FCTL3	; Set LOCK
...		; Re-enable WDT?
EINT		; Enable interrupts

Flash Memory Controller

5-9

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 Initiating a Byte/Word Write from Within Flash Memory

Models: MSP430x1xx

Initiating a Byte/Word Write from Within Flash Memory

Figure 5−8. Initiating a Byte/Word Write from Flash

MSP430x1xx specifications