Instruction Set

PUSH[.W]

Push word onto stack

 

PUSH.B

Push byte onto stack

 

Syntax

PUSH

src or

PUSH.W src

 

PUSH.B

src

 

Operation

SP − 2 → SP

 

 

 

src → @SP

 

 

Description

The stack pointer is decremented by two, then the source operand is moved

 

to the RAM word addressed by the stack pointer (TOS).

Status Bits

Status bits are not affected.

Mode Bits

OSCOFF, CPUOFF, and GIE are not affected.

Example

The contents of the status register and R8 are saved on the stack.

 

PUSH

SR

; save status register

 

PUSH

R8

; save R8

Example

The contents of the peripheral TCDAT is saved on the stack.

 

PUSH.B

&TCDAT

; save data from 8-bit peripheral module,

 

 

 

; address TCDAT, onto stack

Note: The System Stack Pointer

The system stack pointer (SP) is always decremented by two, independent of the byte suffix.

RISC 16−Bit CPU

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Texas Instruments MSP430x1xx manual Push.W, Push.B
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MSP430x1xx specifications

The Texas Instruments MSP430x1xx series is a family of ultra-low-power microcontrollers that are highly regarded in the embedded systems community for their versatility and performance. Designed for applications ranging from portable instrumentation to low-power industrial devices, the MSP430x1xx combines flexibility and efficiency with advanced features tailored for energy-sensitive applications.

One of the standout characteristics of the MSP430x1xx is its ultra-low-power operation. This series offers several low-power modes that can significantly extend battery life in portable devices. The microcontroller can be in active mode, low-power mode, or even in a deep sleep state, allowing developers to optimize power consumption based on the application's requirements. In fact, some configurations can operate at just a few microamps, making it ideal for battery-operated devices.

Another key feature is the 16-bit RISC architecture that provides powerful processing capabilities while maintaining a low power profile. The MSP430x1xx series supports a maximum clock speed of 16 MHz, allowing for efficient task execution while consuming minimal energy. This architecture ensures that programs run smoothly while the microcontroller remains energy efficient.

The MSP430x1xx is equipped with various integrated peripherals, including analog-to-digital converters (ADCs), timers, and communication interfaces like UART, SPI, and I2C. The inclusion of a powerful ADC enables the microcontroller to handle sensor readings with high accuracy, making it suitable for applications like environmental monitoring and medical devices. The integrated timers provide essential functionality for real-time applications, allowing for event-driven programming and precise timing control.

Memory options in the MSP430x1xx series are also robust, with configurations offering flash memory sizes from 1 KB to 64 KB. This flexibility allows developers to choose the optimal memory size for their specific applications, accommodating a wide range of requirements.

Additionally, the MSP430x1xx microcontrollers are designed with a wide operating voltage range, typically from 1.8V to 3.6V, making them compatible with various power sources and further enhancing their usability in diverse applications.

In summary, the Texas Instruments MSP430x1xx series of microcontrollers is an excellent choice for developers seeking low-power, high-performance solutions for embedded applications. With an efficient architecture, a rich set of peripherals, and flexible memory options, these microcontrollers are positioned to meet the growing demands of modern electronic designs, particularly in battery-powered and energy-sensitive applications.
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