Lookup Instructions

4.9 Lookup Instructions

Table lookup instructions transfer data from program memory (ROM) to data memory or accumulators. These instructions are useful for reading permanent ROM data into the user program for manipulation. For example, lookup tables can store initial filter coefficients, characters for an LCD display which can be read for display in the LCD screen, etc. There are four lookup instructions as shown in Table 4±44. Lookup instructions always read the program memory address from the second argument (which is accumulator or its offset). An asterisk (*) always precedes this accumulator to indicate that this is an address.

Table 4±44. Lookup Instructions

Instructions	Description

	Data Transfer

MOV {adrs}, *An	The program memory address is stored in accumulator An. Store the contents of
	this address in data memory location referred by addressing mode {adrs}.

MOV An[~], *An[~] [, next A]	The program memory address is stored in accumulator An or its offset An~. Store
	the contents of this address in accumulator An or An~.

MOVS {adrs}, *An	The program memory string address is stored in accumulator An. Store the
	contents of this address to the data memory string referred by the addressing
	mode {adrs}. The string length is defined in STR register.

MOVS An[~], *An[~]	The program memory string address is stored in accumulator An or its offset An~.
	Store the contents of this address to the accumulator string An or its offset An~.
	The string length is defined in STR register.

Data Manipulation on Strings

ADDS An[~], An[~], pma16	ADD the accumulator string An or its offset An~ with the program memory string at
	location pma16 and store the result to the accumulator string An or its offset An~.
	The string length is defined in STR register.

ANDS An[~], An[~], pma16	Bitwise/logical AND the string An (or its offset An~) with the program memory
	string at location pma16 and store the result in the accumulator string An or its
	offset An~. The string length is defined in STR register.

CMPS An[~], pma16	Compare the accumulator string An (or its offset An~) with the program memory
	string at location pma16 and store the result in accumulator string An or its offset
	An~. The string length is defined in STR register.

SUBS An[~], An[~], pma16	Subtract accumulator string An (or its offset An~) with program memory string at
	location pma16 and store the result in accumulator string An or its offset An~. The
	string length is defined in STR register.

XORS An[~], An[~], pma16	Bitwise/Logical XOR the accumulator string An or its offset An~ with program
	memory string at location pma16 and store the result to accumulator string An or
	its offset An~. The string length is defined in STR register.

Assembly Language Instructions

4-57

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.

Texas Instruments MSP50C614 ±44. Lookup Instructions, Instructions Description Data Transfer

Models: MSP50C614