Contents
Are there any GPIO pins in the MSP430?
Most pins of the MSP430 operate as GPIO pins, with a possibility of functioning as a specialized pin in the right configuration. As GPIO pins, each pin is independently controlled and can be made an input and an output, high or low.
What does GPIO stand for in microcontroller?
GPIO stands for General Purpose Input Output and refers to the fact that the pins can support both output and input functionalities. Looking physically at any microcontroller you can readily see rows of pins that allow the microcontroller to control and communicate with outside devices.
What does pxout do in GPIO input mode?
PxOUT – When the pin is in input mode (as selected by PxDIR) and REN is enabled, this register selects whether the resistors is a pull-up (1) or pull-down (0) PxREN only controls whether the functionality is enabled. PxOUT in this mode is the one that controls whether the resistor is pull-up or pull-down. A word of caution is in place.
How does the MSP430 work in input mode?
The MSP430 also requires that applied voltages to pins in input mode be within specification. The MSP430 uses a Schmitt-Trigger at the input of each pin to determine whether the voltage represents a logic High (1) or Low (0). The datasheet specifies what to expect as far as logic thresholds.
How many I / O ports does the TI MSP430 have?
MSP430 devices have up to 12 digital I/O ports implemented. Each port has eight I/O pins. Every I/O pin can be configured as either input or output, and can be individually read or written to.
How does the MSP430 determine the voltage of a pin?
The MSP430 uses a Schmitt-Trigger at the input of each pin to determine whether the voltage represents a logic High (1) or Low (0). The datasheet specifies what to expect as far as logic thresholds.
What is pin number 14 of MSP430 LaunchPad?
In this circuit we are using pin number 14 of MSP430 launchpad to blink an LED. Connect pin number 14 of MSP430 with positive leg of LED and through 220ohm resistor. Here resistor is used to limit the current. Because the maximum current any pin of MSP430 can provide up to 40mA so it is used for protection.
What does PxDIR do in MSP430 GPIO interrupt?
Before we get to our MSP430 GPIO Interrupt Example Code, it is important to understand the working of Port registers involved in it. PxDIR: It is a port direction control register. It allows the programmer to specifically select its function by writing 0 or 1. If a pin is selected as 1, then it acts as an output.
What does 0 to 1 mean in GPIO programming?
Setting any bit to 0 in this register will configure the corresponding Pin [0 to 7] to be used as an Input while setting it to 1 will configure it as Output. 2. PxIN (Readonly): Used to Read values of the Digital I/O pins configured as Input. 0 = Input is LOW, 1 = Input is HIGH.