Addressing Modes

3.3.7Immediate Mode

The immediate mode is described in Table 3−10.

Table 3−10.Immediate Mode Description

 

Assembler Code

Content of ROM

 

MOV #45h,TONI

MOV @PC+,X(PC)

 

 

45

 

 

X = TONI − PC

Length:

Two or three words

 

 

It is one word less if a constant of CG1 or CG2 can be used.

Operation:

Move the immediate constant 45h, which is contained in the

 

word following the instruction, to destination address TONI.

 

When fetching the source, the program counter points to the

word following the instruction and moves the contents to the destination.

Comment:

Valid only for a source operand.

Example:

MOV

#45h,TONI

 

Before:

Address

 

Register

After:

 

 

 

 

Space

 

 

 

 

 

 

 

0FF18h

 

 

 

 

0FF16h

01192h

 

 

0FF16h

 

 

 

 

 

0FF14h

00045h

 

 

0FF14h

 

 

 

 

 

0FF12h

040B0h

PC

0FF12h

 

 

 

0FF16h

 

 

 

 

 

 

 

 

 

 

 

 

 

010AAh

0xxxxh

 

+01192h

010AAh

 

 

 

010A8h

 

010A8h

01234h

010A8h

 

 

 

 

 

 

 

010A6h

0xxxxh

 

 

010A6h

 

 

 

 

 

 

 

 

 

 

Address Register

Space

0xxxxh PC

01192h

00045h

040B0h

0xxxxh

00045h

0xxxxh

3-16RISC 16-Bit CPU

Page 52
Image 52
Texas Instruments MSP430x1xx manual 10.Immediate Mode Description

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.