Instruction Classification

4.4.5Class 5 Instructions: Memory Reference

Class 5 instructions provide transfer to and from data memory and all registers except accumulators and Rx which are included in classes 1 and 4. The registers referenced for both read and write operations are the multiplier register (MR), the product high register (PH), the shift value register (SV), the status register (STAT), the top of stack (TOS), the string register (STR), and the four accumulator pointer registers AP0 to AP3. The data pointer register (DP) is read only since its value is established by lookup table instructions. The RPT n (repeat) instruction is write only since repeated instructions cannot be interrupted. IRET and RET instructions are read only operations for popping the stack and are included in this class because the stack is memory mapped. Also included in this class are four flag instructions that modify flag memory and two instructions that multiply memory by MR, storing the results in the PH register.

Table 4±26. Class 5 Instruction Encoding

Bit

16

15

14

13

12

11

10

9

8

7

6

5

4

 

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Class 5

1

1

0

1

 

 

C5

 

 

 

 

 

adrs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RET

1

1

0

1

1

1

1

0

0

0

1

1

1

 

1

1

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IRET

1

1

0

1

1

1

1

0

1

0

1

1

1

 

1

1

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 4±27. Class 5 Instruction Description

 

 

C5

 

Mnemonic

Description

 

 

 

 

 

 

 

0

0

0

0

0

MOV {adrs}, SV

Store SV in the data memory location referred by addressing mode

 

 

 

 

 

 

{adrs}, zero filled on upper 12 bits. Transfer status is modified.

 

 

 

 

 

 

 

0

0

0

0

1

MOV {adrs}, PH

Store the PH in the data memory location referred by addressing mode

 

 

 

 

 

 

{adrs}. Transfer status is modified.

 

 

 

 

 

 

 

0

0

0

1

0

MOV {adrs}, STAT

Store the status (STAT) register contents to the data memory location

 

 

 

 

 

 

referred by addressing mode {adrs} (17 bits including TAG). No

 

 

 

 

 

 

modification of status.

 

 

 

 

 

 

 

0

0

0

1

1

MOV {adrs}, STR

Store string (STR) register contents to data memory location referred by

 

 

 

 

 

 

addressing mode {adrs}, zero filled on upper 8 bits. Transfer status is

 

 

 

 

 

 

modified.

 

 

 

 

 

 

 

0

0

1

 

n

MOV {adrs}, APn

Store the accumulator pointer (APn) register to the data memory location

 

 

 

 

 

 

in {adrs}. The upper 10 bits are zero filled. Transfer status is modified.

 

 

 

 

 

 

 

0

1

0

0

0

MOV {adrs}, MR

Store the contents of the multiplier (MR) register in {adrs}. Transfer

 

 

 

 

 

 

status is modified.

 

 

 

 

 

 

 

0

1

0

0

1

Reserved

 

 

 

 

 

 

 

 

0

1

0

1

0

MOV {adrs}, DP

Store the data pointer (DP) register contents to the location referred by

 

 

 

 

 

 

{adrs}. Transfer status is modified.

 

 

 

 

 

 

 

4-36

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Texas Instruments MSP50C614 manual Class 5 Instructions Memory Reference, ±26. Class 5 Instruction Encoding
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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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