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Texas Instruments MSP430x1xx manual Dadd.W, Dadd.B

Models: MSP430x1xx

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Instruction Set

DADD[.W]

Source and carry added decimally to destination

DADD.B

Source and carry added decimally to destination

Syntax

DADD

src,dst

or DADD.W src,dst

 

DADD.B

src,dst

 

Operation

src + dst + C −> dst (decimally)

Description

The source operand and the destination operand are treated as four binary

 

coded decimals (BCD) with positive signs. The source operand and the carry

 

bit (C) are added decimally to the destination operand. The source operand

 

is not affected. The previous contents of the destination are lost. The result is

 

not defined for non-BCD numbers.

Status Bits

N: Set if the MSB is 1, reset otherwise

 

Z: Set if result is zero, reset otherwise

C:Set if the result is greater than 9999 Set if the result is greater than 99

 

V: Undefined

 

 

Mode Bits

OSCOFF, CPUOFF, and GIE are not affected.

Example

The eight-digit BCD number contained in R5 and R6 is added decimally to an

 

eight-digit BCD number contained in R3 and R4 (R6 and R4 contain the

 

MSDs).

 

 

 

 

CLRC

 

; clear carry

 

 

DADD

R5,R3

; add LSDs

 

 

DADD

R6,R4

; add MSDs with carry

 

JC

OVERFLOW ; If carry occurs go to error handling routine

Example

The two-digit decimal counter in the RAM byte CNT is incremented by one.

 

CLRC

 

; clear carry

 

 

DADD.B

#1,CNT

; increment decimal counter

 

or

 

 

 

 

SETC

 

 

 

 

DADD.B

#0,CNT

; ≡ DADC.B

CNT

3-36

RISC 16−Bit CPU

Page 71 Page 73
Page 72
Image 72
Texas Instruments MSP430x1xx manual Dadd.W, Dadd.B
Page 71 Page 73

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.