Relative Addressing, MOV A2, *R0 | Texas Instruments MSP50C614

Instruction Syntax and Addressing Modes

Example 4.3.12 MOV *R5++R5, A0~, ++A

Refer to the initial processor state in Table 4±8 before execution of this instruction. Preincrement AP0. After preincrement, A0 is AC3 and A0~ is AC19. The contents of AC19 are stored in the data memory location in R5. R5 is then incremented by R5. Final result, AP0=3, R5 = 0x0004, *0x0002 = 0xFEED.

Example 4.3.13

MOV A2, *R0

Refer to the initial processor state in Table 4±8 before execution of this instruc- tion. The contents of the data memory address in R0 are loaded into A2 (AC11). Final result, AC11 = 0x0400. Note the addressing is byte addressing. Thus, *R0 = 0x0454 indicates the word memory location 0x454/2 = 0x022A.

Example 4.3.14

IN *R4++, 0x00

The contents of the I/O port location 0x00 (port PPA) are stored in the location pointed to by R4. R4 is incremented by 2 after this operation.

Example 4.3.15

MOVB *R7++, A3

Refer to the initial processor state in Table 4±8 before execution of this instruc- tion. Store the lower 8 bits of A3 (AC29) in the data memory byte address pointed to by R7. R7 is then incremented by one. Notice that to find the word address, divide the address in R7 by 2. Final result, R7=0x0101, *0x0100 = 0xAB (byte address) or *0x80 = 0xAB00 (word address).

Example 4.3.16

OUT 0x08, *R1±±

Refer to the initial processor state in Table 4±8 before execution of this instruc- tion. The contents of the data memory byte location stored in R1 are placed on port 0x08 (port PPB). R1 is then decremented by 2. Final result, R1 = 0x01FE, *0x08 = 0xCB. Port PPB is 8-bits wide, so the upper 8-bits of *R1 (0x0A) are ignored.

4.3.6Relative Addressing

There are three types of relative addressing on the MSP50P614/MSP50C614: short relative, long relative, and relative to the index register, R5. These ad- dressing modes are described below.

4.3.6.1Relative to Index Register R5

This relative addressing mode uses one of the 8 address registers (R0±R7) as a base value. The index register, R5, is added to the base address value in Rx. The base address register is not modified. Thus, the effective address is Rx + R5.

Syntax:

name [dest,] [src,] *Rx+R5 [, next A] name *Rx+R5 [, src] [, next A]

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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.

Texas Instruments MSP50C614 manual Relative Addressing, MOV A2, R0, R4++, Movb R7++, A3

Models: MSP50C614