msp430 mcu

Label: strong on, and set the CPU microcontroller to synchronize trWhat clock?First, let's talk about what a clock is. The clock is the heart of the microcontroller. Every beat. All the circuits of the single-chip microcomputer are synchronized. It's like when we were doing broadcast gymnastics, the beat We shouted on the broadcast was 1234, 2234, 3234 .... Then, all of our students will follow this pattern. The faster the beat, the faster we move. The slower the beat, the slower our movements.I

, and load the PC register so that the CPU continues to execute the program that is interrupted.The following is an example of application timer interruption.A program is required to set the online output cycle of p1.0 port to 2 ms square wave pulse. MCU crystal oscillator frequencyFosc = 6 MHz.1. Method: the timer t0 is used for 1 ms timing. When the timer value is reached, the interruption is triggered. In the interrupted service program, the p1.0 s

the CPU continues to execute the program that is interrupted.The following is an example of application timer interruption.A program is required to set the online output cycle of p1.0 port to 2 ms square wave pulse. MCU crystal oscillator frequencyFosc = 6 MHz.1. Method: the timer t0 is used for 1 ms timing. When the timer value is reached, the interruption is triggered. In the interrupted service program, the p1.0 status is reversed and the interval

counting time from the pre-installed value to 65536. Specific calculation: Assume that the interrupt time is 1 second, that is to say, register overflow is required once every 1 second to generate an interrupt. Because the frequency of the AVR microcontroller is 8 MHz, that is, there are 8 m clock cycles per second, that is, the number of 8 m times per second. Let us assume that the first step is to set the clock bit to 001, that is, the selected clock frequency is 8 m./256=31250That is, ther

receive the radiation signal of the tested target surface, so as to obtain the temperature of the target surface. 1-12 * design a peak detection circuit to detect and display the peak value of input voltage within a certain period of time. 1-13 * design a valley detection circuit to detect and display the valley values of input voltage in a certain period of time. 1-14 parallel communication based on the FIFO chip. The FIFO chip idt7203 is used as the data storage to implement parallel co

ADC0804 reading the data sequence diagram.Analysis shows that when the intr# becomes low, the cs# is first low, at least after the rd# low TACC time, the data on the digital output reaches a stable state, the digital output port data can be directly read the data will be able to get the signal, read and go, immediately rd# pull high, and then cs# pull high, intr# is automatically changed, when the rd# low tR1 time, intr# automatically pull high, we do not have to intervene.Figure 4.4.6 and figu

the system can not pull down the reset pin caused, but my colleague's other project using the reset chip can also be implemented software reset, what is the reason for the solution.② another problem during the debugging process, an external interrupt trigger has entered two interrupt service subroutines.WORKAROUND: Close the external interrupt after entering the interrupt, and then at the end of the interrupt service subroutine, open an external interrupt, which resolves the issue of two extern

A full set of solutions for voice thermometers Based on the MCUThe DS18B20 temperature sensor is used in the design to collect the temperature in real time,Combined with ISD4004 voice chip and lcd1602 display module, the whole design realizes real-time temperature measurement and display.Displays and carries out voice broadcast, intelligently monitors 0 critical temperature values.The reference principle is as follows: Full data download: https://www.fageka.com/ I /vCIaOEN4904A full set of

#include MCU Lesson 15th: Clock

Jp3 is connected to P0, VCC is connected to + 5 V, and the eight left pins of the matrix keyboard are connected to P1. The expected result is to press 0th buttons, the digital display is 0, and so on. Note that the digital tube here is co-anode. #include Note that there is no deshake operation in the code because this does not affect the experiment results. MCU Lesson 8th: matrix keyboard scanning

; i ) { intv = src[i] 0xFF; String HV=integer.tohexstring (v); if(Hv.length () ) {stringbuilder.append (0); } stringbuilder.append (HV); } returnstringbuilder.tostring (); }4. Convert the hexadecimal byte[] intact to a string and separate each byte with a space, such as byte[]{0x7e,0x80,0x11,0x20}→7e 80 11 20, which can be used for log printing Public StaticStringBuilder Byte2hexstr (byte[] data) { if(Data! =NULL data.length > 0) {StringBuilder StringBuilder=

Common data conversion methods for Android and MCU communication 1. Convert GB2312 into Chinese, such as bafac2dcb2b7→ carrots, two bytes to synthesize a text public static string STRINGTOGBK (String string) throws Exception { byte[] bytes = new Byte[string.length ()/2]; for (int j = 0; J 　2. Convert Chinese to GB2312, and the results are returned in byte[] form, such as Carrot →new byte[]{ba FA C2 DC B2 B7}, one word is divided i

"variable.h"/* user code BEGIN includes */* user code END includ ES */* Private variables---------------------------------------------------------*/Uart_handletypedef Huart1; /* User code BEGIN PV */* Private Variables---------------------------------------------------------*/* User code EN D PV */* Private function prototypes-----------------------------------------------*/void Systemclock_config (void); void Error_Handler (void); static void Mx_gpio_init (void); static void Mx_usart1_uart_i

Bug in STM32F4 Series MCU, window watchdog WWDG. 1. If it is possible to pre-feed the dog interrupt, then the following two points must be met (1) Before turning on the WWDG interrupt, the EWI flag bit in the SR register must be zeroed out, otherwise the watchdog will constantly reset (2) Add a small delay to the WWDG_IRQ, otherwise the watchdog will be constantly reset 2. If there are other interrupts in the system, such as keystrokes, set a vari

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Recently, a pic ultra-low power project has been done with very high power requirements. I have seen some articles on the internet before, but it is not good to test them.Here to summarize, to share a bit for the peer, software programming to pay attention to the following points,1, no module to closeThe module here is not only the enable bit, but PMD2, do not use the IO port to be placed into the outputHere and other articles on the internet say the input is not the same, measured down my side

% 10]; // digital display, single-digitSmg_buffer [1] = SMG [Shijian/10% 10]; // ten} // Timer ConfigurationVoid config_interruptime0 (){Tmod = tmod 0xf0;Tmod = tmod | 0x01;Th0 = 0xfc;Tl0 = 0x66;Ea = 1;Et0 = 1;Tr0 = 1;} Void Init (){Addr3 = 1;Enled1 = 0;}Int main (){Init ();Config_interruptime0 ();While (1){If (k = 1) // check whether the 1-second scheduled time has been reached{K = 0; // K ResetSmg_display (); // refresh the display}}Return 0;} Void interruptime0 () interrupt 1{Static unsigne

The serial port has two buffer registers, sbuf. One is the sending register and the other is the receiving register, which are completely independent in the physical structure. They are all byte addressing registers, and the byte addresses are all 99 H. This overlapping address is differentiated by read/write commands: During serial sending, the CPU writes data to sbuf, and at this time, 99h indicates sending sbuf; During serial receiving, the CPU reads data from sbuf, at this time, 99h indicate

usually choose the direct plug-in dip-40 encapsulation microcontroller for learning (if not specified in the following article, single-Chip Microcomputer refers to the directly inserted package of FIG ). Other chips may also use the same encapsulation as single-chip microcomputer. For example, the ISD4004 voice chip is often packaged with a wide dip-40. When recognizing a chip, you only need to look at the printed letter. How should I identify so many integrated circuits with so many pins? For

/************************************** Serial Communication Experiment* Oscillator 11.0592 MHz* Baud rate 9600bps* Interrupt mode implementation: the microcontroller receives computer data and sends it back to the computer after adding 1***************************************/ # Include Unsigned char dat; *******************/Void uart_config (unsigned long Baud, CY) // baud rate, Cy Crystal Oscillator{Tmod = 0x20; // The timer 1 working mode. The default value is.Th1 = 256-(CY/(12*32 * baud ));