Addressing Modes

3.3.6Indirect Autoincrement Mode

The indirect autoincrement mode is described in Table 3−9.

Table 3−9. Indirect Autoincrement Mode Description

 

 

 

Assembler Code

Content of ROM

 

 

 

 

 

MOV

@R10+,0(R11)

MOV

@R10+,0(R11)

 

 

Length:

 

One or two words

 

 

 

 

 

 

Operation:

Move the contents of the source address (contents of R10) to

 

 

 

 

the destination address (contents of R11). Register R10 is

 

 

 

 

incremented by 1 for a byte operation, or 2 for a word

 

 

 

 

operation after the fetch; it points to the next address without

 

 

 

 

any overhead. This is useful for table processing.

 

 

Comment:

Valid only for source operand. The substitute for destination

 

 

 

 

operand is 0(Rd) plus second instruction INCD Rd.

Example:

 

MOV

@R10+,0(R11)

 

 

 

 

Before:

 

 

 

 

Register

After:

 

 

Register

 

 

Address

 

 

Address

 

 

 

Space

 

 

 

 

 

 

Space

 

 

 

 

 

 

 

 

 

 

 

 

 

PC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0FF18h

 

0xxxxh

 

 

 

 

0FF18h

 

0xxxxh

 

 

 

0FF16h

 

00000h

 

R10

 

0FA32h

0FF16h

 

00000h

R10

0FA34h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0FF14h

 

04ABBh

PC

R11

 

010A8h

0FF14h

 

04ABBh

R11

010A8h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0FF12h

 

0xxxxh

 

 

 

 

0FF12h

 

0xxxxh

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0FA34h 0xxxxh 0FA32h 05BC1h 0FA30h 0xxxxh

010AAh 0xxxxh 010A8h 01234h 010A6h 0xxxxh

0FA34h 0xxxxh 0FA32h 05BC1h 0FA30h 0xxxxh

010AAh 0xxxxh 010A8h 05BC1h 010A6h 0xxxxh

The autoincrementing of the register contents occurs after the operand is fetched. This is shown in Figure 3−8.

Figure 3−8. Operand Fetch Operation

Instruction

Address

Operand

+1/ +2

RISC 16-Bit CPU

3-15

Page 50 Page 52
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Texas Instruments MSP430x1xx manual 9. Indirect Autoincrement Mode Description
Page 50 Page 52

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.
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