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Texas Instruments MSP50C614 manual 8 Tag/Flag Bits

Models: MSP50C614

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Instruction Syntax and Addressing Modes

4.3.8Tag/Flag Bits

The words TAG and flag may be used interchangeably in this manual. The TAG bit is the 17th bit of a word of data memory. There are 640 words of RAM, each 17 bits wide, on the C614. Therefore, there are 640 TAG bits on the C614. When an instruction of the format,

MOV accumulator, RAM

is performed, the STAT register is affected by various properties of this trans- fer. The TAG bit of the RAM location is copied into the TAG bit of the STAT reg- ister during such transfers.

The TAG bit can be modified using several instructions: STAG, RTAG, SFLAG, RFLAG. There are subtle differences between these instructions that the user must understand before using them. The first difference between the xTAG and xFLAG instructions is the addressing.

STAG *0x0000 ;sets the TAG bit of RAM word zero

RTAG *0x0002 ;clears the TAG bit of RAM word one

STAG *0x0002 * 2 ;sets the TAG bit of RAM word two

STAG and RTAG use RAM byte addresses to specify which TAG to set or clear. This immediately causes confusion since there are 1280 bytes and only 640 TAGs. What happens when an odd byte is used to set a tag with STAG?

STAG *0x0001 ;sets the TAG bit of RAM word zero

STAG *0x0003 ;sets the TAG bit of RAM word one

STAG *0x0005 * 2 ;sets the TAG bit of RAM word five

All word boundaries in RAM start at even numbers, RAMeven. If an odd byte, RAMeven + 1 is used to set a TAG, then the TAG for RAMeven is set. Thus,

STAG *0x0000

STAG *0x0001

are functionally equivalent.

As a sharp contrast, the SFLAG and RFLAG instructions use RAM word ad- dresses to specify which TAG to set or clear.

SFLAG *0x0000 ;sets the TAG bit of RAM word zero

SFLAG *0x0001 ;sets the TAG bit of RAM word one

Another difference between the xTAG and xFLAG instructions is the addres- sing modes. STAG and RTAG can use {adrs} addressing modes. This in- cludes, direct, short relative, relative to R5, long relative, and indirect addres- sing modes. This affects the number of clock cycles it takes to execute xTAG instructions.

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Texas Instruments MSP50C614 manual 8 Tag/Flag Bits
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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.