rcc database

The stm32 chip manual shows clearly that there are four clock sources: 1. HSI (Internal High-Speed clock 8 MHz) provides a clock source that supports BIT system clock 2. HSE (external high-speed clock) provides system clock and RTC clock source 3. LSE (low-speed external clock 32.768 kHz) can provide a clock source for rtc 4. LSI (low-speed internal clock) can provide the clock source for the independent watchdog First, let's analyze the database fu

To view the system clock with the oscilloscope, the system clock is output to the MCO pin.After one night, I saw the waveform.First, create an empty project. Code Comment out:; Import systeminit; Delete systeminit write RCC initialization function by yourself; LDR r0, = systeminit; Blx R0The following is a setup function that uses HSI as the system clock. If the PLL is not practical, the HSI is directly output to the MCO pin:Void my_rccinitmcohsi (voi

RCC Clock module is not good understanding, the first contact I also confused, and I really mastered it is also relatively late, is that I learned to use Register control Development Board to really understand his operating principles and laws, but why I re-revised but placed in the forefront, because this is the whole embedded foundation, beginners are more difficult , but I still want to be able to grasp the best, because the real-time is very impor

divides the clock signal (such as HSE) by frequency division or frequency doubling (PLL) to obtain the system clock. The system clock is divided by frequency to generate the clock used by the peripherals;RCC setting process: 1. Reset the RCC register to the default rcc_deinit value. 2. Enable the external high-speed clock crystal oscillator HSE rcc_hseconfig (rcc_hse_on) 3. Wait for the external high-speed

are band-enabled, such as AHB bus clocks, core clocks, various APB1 peripherals, APB2 peripherals, and so on.When a module needs to be used, the corresponding clock must be enabled first. Note that the timer multiplier, when the division of the APB is 1 o'clock, its multiplier value is 1, otherwise its multiplier value is 2.The devices connected to the APB1 (low Speed peripherals) are: Power Interface, Backup interface, CAN, USB, i2c1, I2C2, UART2, UART3, SPI2, window watchdog, Timer2, Timer3,

Reset:1. System Reset: A Systems Reset Sets all registers-their reset values except for the RTC, RTC BackupRegisters and Control/status Register, RCC_CSRReset Source view: RCC_CSROption byte loader:stm32l15xxx Flash Programming Manual (PM0062)2. Power RESET:A Power Reset sets all registers to their reset values including for the RTC domain3. RTC and Backup registers Reset:Reset Source: A software reset, triggered by setting the Rtcrst bit in the RCC_CSR registerPower Reset (BOR/POR/PDR)Clocks:Fe

As the current hand only 16MHZ of the 2520 package of SMD Crystal, 8MHZ This package does not make so small, so first with 16MHZ, so we need to modify the program-related RCC clock:1,stm32f4xx.h#define Hse_value ((uint32_t) 16000000)/*!2,system_stm32f4xx.c/* Pll_vco = (hse_value or hsi_value/pll_m) * Pll_n */#define PLL_M /* USB OTG FS, SDIO and RNG Clock = pll_vco/pllq */#define PLL_Q 7#if defined (stm32f40_41xxx)#define PLL_N 336/* SYSCLK = pll_vco/

Moc is mainly used to process signals and slots inside classes containing q_object into moc_xxx files. Because the QT signal and slot part of this is not pure C + +, it is MOC to compile the information contained in Q_object. When you do not use the signal to remove the q_object can also be compiled through. Just can't handle the signal these. RCC is mainly to convert the RC resource file into a byte stream in the form of CPP files, all the resourc

This section relates to: Create a database, view a database, modify a database, delete a database Starting Time: 2018-02-13 20:47Create DATABASE: Syntax:Create database name [ library option ];Library Options Description:

Tags: new checkpoint library file refresh data loss ever permissions database name allowed Summary article: Http://www.cnblogs.com/dunitian/p/4822808.html#tsql Paste Error First: Spit on the trough for a moment: Go to the Chase: Create a new database with the same name Stop MSSQL Service Replacing