Bit, Byte, Word and String Addressing

Figure 4±4. Data Memory Example

Absolute Word

Data Memory Location (even) = 2 *

MS Byte

LS Byte

Data Memory

Memory Location

(Absolute word memory location)

Location (odd)

 

 

 

 

 

 

 

 

0x0000

0x0000

 

0x12

0x34

0x0001

 

 

 

 

 

 

0x0001

0x0002

 

0x56

0x78

0x0003

 

 

 

 

 

 

0x0002

0x0004

 

0x9a

0xbc

0x0005

 

 

 

 

 

 

0x0003

0x0006

 

0xde

0xf0

0x0007

 

 

 

 

 

 

0x0004

0x0008

 

0x11

0x22

0x0009

 

 

 

 

 

 

0x0005

0x000a

 

0x33

0x44

0x000b

 

 

 

 

 

 

Example 4.5.4

MOV STR, 4±2

 

 

 

 

MOV AP0, 2

 

 

 

MOVBS A0, *0x0003

Refer to Figure 4±4 for this example. The byte-string length is 4. It is loaded to the string register (STR) in the first instruction. AP0 is 2 and it points to AC2. Third instruction loads the value of the string at byte address, 0x0003, and subsequently stores its contents into four consecutive accumulators starting from AC2. The result is, AC2 = 0x0078, AC3 = 0x009A, AC4 = 0x00BC, AC5 = 0x00DE.

Example 4.5.5

MOV

STR,

4±2

 

MOV

AP0,

2

 

MOVS A0,

*0x0003

Refer to Figure 4±4 for this example. The byte-string length is 4. AP0 is loaded with 2 and points to AC2. The third instruction loads the value of the string at address 0x0002 (LSB bit is assumed 0) and stored into four consecutive accumulators starting from AC2. The result is, AC2 = 0x5678, AC3 = 0x9ABC, AC4 = 0xDEF0, AC5 = 0x1122. Same result can be obtained by replacing the third instruction by,

MOVS A0, *0x0001 * 2

which uses the absolute word memory address.

Example 4.5.6

MOV STR, 4±2

 

OV AP0,

2

 

MOV R0,

0x0005

MOVBS A0, *R0++

Refer to Figure 4±4 for this example. The byte string length is 4. AP0 points to AC2. R0 is loaded with 0x0005. The fourth instruction loads the value of the byte-string at the address in R0 (i.e, 0x0005 in byte mode). R0 auto±incre- ments by 1 after every fetch and stores the RAM contents into four consecutive accumulators starting from AC2. The result is, AC2 = 0x00BC, AC3 = 0x00DE, AC4 = 0x00F0, AC5 = 0x0011. There were four byte fetches and the new value of R0 = 0x0009.

Assembly Language Instructions

4-47

Page 138 Page 140
Page 139
Image 139
Texas Instruments MSP50C614 manual ±4. Data Memory Example, Which uses the absolute word memory address
Page 138 Page 140

MSP50C614 specifications

The Texas Instruments MSP50C614 is a microcontroller that belongs to the MSP430 family, renowned for its low power consumption and versatile functionality. Primarily designed for embedded applications, this microcontroller is favored in various industries, including consumer electronics, industrial automation, and healthcare devices.

One of the standout features of the MSP50C614 is its ultra-low power technology, which enables it to operate in various power modes. This makes it ideal for battery-powered applications, where energy efficiency is crucial. The MSP430 architecture allows for a flexible power management system, ensuring that energy is conserved while providing robust performance.

The MSP50C614 is equipped with a 16-bit RISC CPU that delivers high performance while maintaining low power usage. With a maximum clock frequency of 16 MHz, it can execute most instructions in a single cycle, resulting in swift operation and responsive performance. This microcontroller also comes with a generous flash memory capacity, allowing developers to store large amounts of code and data conveniently.

In terms of peripherals, the MSP50C614 is highly versatile. It features a range of digital and analog input/output options, including multiple timers, GPIO ports, and various communication interfaces like UART, SPI, and I2C. This extensive set of peripherals allows for seamless integration with other components and simplifies the design of complex systems.

The integrated 12-bit Analog-to-Digital Converter (ADC) stands out as a valuable characteristic of the MSP50C614. This feature enables the microcontroller to convert physical analog signals into digital data, making it particularly useful for sensing applications and real-time monitoring.

Another noteworthy technology employed in the MSP50C614 is its support for low-voltage operations. With a broad supply voltage range, this microcontroller can function efficiently in diverse environments and is suitable for low-power applications, enhancing its practicality.

Moreover, Texas Instruments provides software support in the form of Code Composer Studio and various libraries that make it easier for developers to program and utilize the MSP50C614 effectively.

In summary, the Texas Instruments MSP50C614 microcontroller is a powerful, low-power solution equipped with the features and technologies necessary for efficient operation in a wide array of applications. Its blend of performance, flexibility, and energy efficiency makes it a popular choice among engineers and designers looking to create innovative, sustainable designs in the rapidly evolving tech landscape.
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