System Registers

During accumulator read operations, both An and offset An~ are fetched. Depending on the instruction, either or both registers may be used. In addition, some write operations allow either register to be selected.

The accumulator block can also be used in string operations. The selected accumulator (An or An~) is the least significant word (LSW) of the string and is restored at the end of the operation. String instructions are described in detail in section 4.8.

4.2.9Accumulator Pointers (AP0±AP3)

The accumulator pointer (AP) registers are 5 bit registers which point to one of the 32 available accumulators. The APs contain the index of accumulators. Many instructions allow preincrement or predecrement accumulator pointers. Such instructions have a suffix of ++A for preincrement or ± ±A for predecrement. Accumulator pointers can be stored or loaded from memory using various addressing modes. Limited arithmetic operations can be performed on accumulator pointers.

Bit

Bits 16 ± 5

4

3

2

1

0

 

 

 

 

 

 

 

AP0±AP3

Not used

 

Points to An

 

 

 

n = val (b0±b4)

 

 

 

 

 

 

 

4.2.10 Indirect Register (R0±R7)

Indirect registers, R0±R7, are 16-bit registers that are used in various addressing modes or as general-purpose registers. R0, R1, R2 and R3 can be usedsolely as general-purpose registers. These registers can also be used as indirect registers with relative addressing.

The R4 or LOOP register is used with instructions BEGLOOP and ENDLOOP to define a hardware controlled loop. If R4 is loaded with a value, n (0 ≤ n ≤ 32767), the BEGLOOP and ENDLOOP block will be executed n+2 times. The loop stops when R4 becomes negative.

The R5 or INDEX register is used with indirect addressing and relative addres- sing modes of certain instructions.

The R6 or PAGE register is used with page relative addressing and relative flag addressing.

The R7 or STACK register holds the pointer to the stack. It can be used as a general-purpose register as long as no CALL/RET instructions are used before restoring it with its old value. However, this register can only be used as a general-purpose register when maskable interrupts are disabled. The old

Assembly Language Instructions

4-5

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Texas Instruments MSP50C614 manual Accumulator Pointers AP0±AP3, Indirect Register R0±R7, Bit
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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.
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