When introducing these four I/O ports, a "pull-up resistor" was mentioned. So what is a pull-up resistor? What does it do? Since it is a resistor, it is of course a resistor. When used as an input, the pull-up resistor pulls its potential up, and if the input is low, it can provide a current source; so if the P0 port is used as an input, it is in a high impedance state, and only an external pull-up resistor can be effective.
Keywords：MSP430
Reference address：MSP430 Pull-up Resistors & Secondary Functions of I/O Ports
The "second function" you mentioned should refer to the peripheral module function. If you use the module, select "second function", and if you don't use the module, select "first function". You can select by setting the PxSEL register. Writing "0" to a certain bit is I/O; writing "1" is "second function". When using a comparator (on-chip peripheral module), set it to the second function. Of course, if you use an off-chip comparator and send its output high or low level (1 or 0) to MSP430, then select "first function".
Previous article：How the program is debugged in RAM and how it is run after being solidified
Next article：Key program PORT interrupt program
- Popular Resources
- Popular amplifiers
3584JM
Recommended Content
MSP432 product training
TI's solution for high-precision ultrasonic flow measurement at low flow rates
Getting Started with Zero Basics: Teach you step-by-step how to quickly develop MSP430™ projects
3 hours of practical experience + analysis: TI engineers take you step by step to get started with MSP430
Application of TI MSP430 integrated configurable signal chain module in the field of sensing measurement
Latest Microcontroller Articles
- Learn ARM development(16)There are many things to learn about ARM, and interrupts are definitely something that needs to be learned. Since the CPU introduced interrupts, it has truly entered the multi-tasking system and greatly improved work efficiency. ...
- Learn ARM development(17)Because all embedded systems use interrupts, how does my S3C44B0 interrupt the process? Then I need to understand the whole process. To understand it in depth, the best way is to write a program ...
- Learn ARM development(18)Last time, we have learned about the interrupt handling process of ARM and how to set the interrupt function. So, does it work like this? The answer is no. Because S3C44B0 has several registers that control ...
- Embedded system debugging simulation toolAfter the embedded hardware system is designed, it needs to be debugged. Whether it is hardware debugging, software debugging or program solidification, debugging simulation tools are needed. ...
- A small question that has been bothering me recently has finally been solved~~Recently, I have not been able to understand the concept of drivers very well. Sometimes I can get a feel for it by combining some USB examples written by others, but because the ARM system does not directly explain the pins like the microcontroller ...
- Learn ARM development (1)
- Learn ARM development (2)
- Learn ARM development (4)
- Learn ARM development (6)
He Limin Column
Microcontroller and Embedded Systems Bible
Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
MoreSelected Circuit Diagrams
MorePopular Articles
- LED chemical incompatibility test to see which chemicals LEDs can be used with
- Application of ARM9 hardware coprocessor on WinCE embedded motherboard
- What are the key points for selecting rotor flowmeter?
- LM317 high power charger circuit
- A brief analysis of Embest's application and development of embedded medical devices
- Single-phase RC protection circuit
- stm32 PVD programmable voltage monitor
- Introduction and measurement of edge trigger and level trigger of 51 single chip microcomputer
- Improved design of Linux system software shell protection technology
- What to do if the ABB robot protection device stops
MoreDaily News
- Wi-Fi 8 specification is on the way: 2.4/5/6GHz triple-band operation
- Wi-Fi 8 specification is on the way: 2.4/5/6GHz triple-band operation
- Vietnam's chip packaging and testing business is growing, and supply-side fragmentation is splitting the market
- Vietnam's chip packaging and testing business is growing, and supply-side fragmentation is splitting the market
- Three steps to govern hybrid multicloud environments
- Three steps to govern hybrid multicloud environments
- Microchip Accelerates Real-Time Edge AI Deployment with NVIDIA Holoscan Platform
- Microchip Accelerates Real-Time Edge AI Deployment with NVIDIA Holoscan Platform
- Melexis launches ultra-low power automotive contactless micro-power switch chip
- Melexis launches ultra-low power automotive contactless micro-power switch chip
Guess you like
- Package size issue
- What are the changes in the maximum output current and load limit of a differential output amplifier when it is single-ended output?
- Get a sneak peek at the practical white paper "Harnessing the Power of 5G"!
- How to write C/C++ code in DSP?
- 70Mpa High-pressure Hydrogen Fuel Vehicle Filling Station Overall Solution
- 【CH579M-R1】+ driving LCD19264 display
- Qorvo's Answer to Connectivity: Reducing Wi-Fi Interference
- BD71837MWV-E2,TPS65982ABZQZR,SP335EER1-L/TR
- Comparison between LC filtering and CLC filtering!
- VAS5175A_VAS5176 Lithium Battery Charge Management IC Application Parameters
京公网安备 11010802033920号