Transmit Bit Timing, Brclk = | Texas Instruments MSP430x1xx specs

USART Operation: UART Mode

Transmit Bit Timing

The timing for each character is the sum of the individual bit timings. By modulating each bit, the cumulative bit error is reduced. The individual bit error can be calculated by:

		(j ) 1)	j
Error [%] +	baud rate	(j ) 1)	UxBR ) S mi* (j ) 1)	100%
	BRCLK		i+0

With:

baud rate: Desired baud rate

BRCLK: Input frequency − UCLKI, ACLK, or SMCLK

j:Bit position - 0 for the start bit, 1 for data bit D0, and so on UxBR: Division factor in registers UxBR1 and UxBR0

For example, the transmit errors for the following conditions are calculated:

Baud rate =	2400
BRCLK =	32,768 Hz (ACLK)
UxBR =	13, since the ideal division factor is 13.65
UxMCTL =	6Bh: m7=0, m6=1, m5=1, m4=0, m3=1, m2=0,
	m1=1, and m0=1. The LSB of UxMCTL is used first.

Start bit Error [%] + baud rate ((0 ) 1) UxBR ) 1)–1100% + 2.54%
BRCLK
Data bit D0 Error [%] + baud rate	((1 ) 1)	UxBR ) 2)–2	100% + 5.08%
BRCLK
Data bit D1 Error [%] + baud rate	((2 ) 1)	UxBR ) 2)–3	100% + 0.29%
BRCLK
Data bit D2 Error [%] + baud rate	((3 ) 1)	UxBR ) 3)–4	100% + 2.83%
BRCLK
Data bit D3 Error [%] + baud rate	((4 ) 1)	UxBR ) 3)–5	100% +*1.95%
BRCLK
Data bit D4 Error [%] + baud rate	((5 ) 1)	UxBR ) 4)–6	100% + 0.59%
BRCLK
Data bit D5 Error [%] + baud rate	((6 ) 1)	UxBR ) 5)–7	100% + 3.13%
BRCLK
Data bit D6 Error [%] + baud rate	((7 ) 1)	UxBR ) 5)–8	100% + *1.66%
BRCLK
Data bit D7 Error [%] + baud rate	((8 ) 1)	UxBR ) 6)–9	100% + 0.88%
BRCLK
Parity bit Error [%] + baud rate	((9 ) 1)	UxBR ) 7)–10	100% + 3.42%
BRCLK
Stop bit 1 Error [%] + baud rate	((10 ) 1)	UxBR ) 7)–11	100% + *1.37%
BRCLK

The results show the maximum per-bit error to be 5.08% of a BITCLK period.

USART Peripheral Interface, UART Mode

13-13

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 Transmit Bit Timing, Brclk =

Models: MSP430x1xx

Transmit Bit Timing

BRCLK

BRCLK =

MSP430x1xx specifications