metric clock

In stm32, there are five clock sources:HSI,HSE,LSI,LSE,PLL. ①HSIIt is a high-speed internal clock, RC oscillator, and the frequency is 8 MHz. ②HSEIt is a high-speed external clock, which can be connected to a Z/Ceramic Resonator or an external clock source. The frequency range is 4 MHz ~ 16 MHz. ③LSIIt is a low-s

1. System interruption and clock cycle 1.1 system interruption Interrupt is a hardware mechanism that notifies the CPU Of an asynchronous event. Once the interrupt is identified by the system, the CPU stores partial (or all) context values, that is, the values of some (or all) registers, and jumps to a special subroutine, it is called the interrupt service subroutine (ISR ). Interrupt Service subprograms are used to process events. After processing i

Android Phone small Alarm ClockIn daily life work, there are often important things or schedules, and the alarm clock, as a tool to remind people, becomes an indispensable part of many people's lives.The software includes the functions of alarm settings, alarm clock creation, alarm clock off and other modules. The use of this application is simple, easy to learn

Crystal oscillator and Clock The cc2530 has an internal system clock, or a master clock. The system clock Source is a 16Mhz rc crystal oscillator or 32MHz crystal oscillator. The clock can be controlled using the Clkconcmd special function register. In addition, the chip als

From the perspective of clock source, there are two types of external clock (E) and internal clock (I ).From the perspective of clock rate, there are two types of high-speed clock (HS) and low-speed clock (LS ).In combination, the

Tags: LSA generated audio span describe ATI channel Ann correctAudio ClockingAudio clock==============This text describes the audio clocking terms in ASOC and digital audio inGeneral. Note:audio clocking can be complex!This article describes the audio clock terms in ASOC and digital audio in general.Note:audio Clock is a very complicated stuff.Master ClockMaster

It is not complete enough to write it casually. Remember it for the moment, and there are still some things you haven't figured out !~ Recently, we are working on porting the new kernel version, and bringing the original BSP to the latest kernel 2.6.31-rc7 (which has been released again ). When rewriting the system timer (sys_timer), I found that there is always something missing, and I don't know anything. The boss's proposal + refer to Daniel'sCodeAnd found that the BSP did not have

1. In stm32, there are five clock sources:HSI,HSE,LSI,LSE,PLL. ①HSIIt is a high-speed internal clock, RC oscillator, and the frequency is 8 MHz. ②HSEIt is a high-speed external clock, which can be connected to a Z/Ceramic Resonator or an external clock source. The frequency range is 4 MHz ~ 16 MHz. Generally, it is con

Article Title: Linux clock Processing Mechanism. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. In Linux, many activities are related to time, such as process scheduling and network processing. Therefore, understanding the clock processing mechanism in the Linux operati

1. There are two types of clocks under Linux:1.1 Real Clock RTCThe "Real Time Clock", which is powered by the onboard battery, is also called the RTC or the CMOS clock, the hardware clock. When the operating system shuts down, use this to record the time, but for the running system is not the time.1.2 System

The arm arch in kernel-2.6.22 has added support for dynticks, clocksource/event. We have found some recent changes to the kernel clock and timer subsystems.Generally, soft-timer (timer wheel/hrtimer) is composed of hardware-timer (such as clock interruption) and related clock source (E. g GPT in SOC) driver, so I plan to start from the

Transferred from: http://blog.csdn.net/droidphone/article/details/7975694Clock source is used to provide a time baseline for the Linux kernel, and if you get the current time with the Linux Date command, the kernel reads the current clock source, transforms and returns the appropriate time units to the user space. At the hardware level, it is usually implemented as a counter driven by a fixed clock frequenc

14 superb HTML5 clock animations, Clock animation is also widely used in Web pages. In some personal blogs, we often see some quite personalized HTML5 clock animations. Today, we share with you 14 ultra-fashion HTML5 clock animations in different forms, including disc clock,

1. Clock domain: MSYS, Dsys, PSYS(1) because the s5pv210 clock system is more complex, the internal peripheral module too many, so the entire internal clock divided into 3 chunks, called 3 domains.(2) MSYS:CPU (Cortex-a8 Core), DRAM controllers (DMC0 and DMC1), Iramirom(3) Dsys: All the modules related to video display, codec, etc.(4) PSYS: And the internal vario

Clock source is used to provide a time baseline for the Linux kernel. If you use the Linux date command to obtain the current time, the kernel will read the current clock source, convert it, and return a suitable time unit to the user space. On the hardware layer, it is usually implemented as a counter driven by a fixed clock frequency. The counter can only be mo

The clock part is relatively easy. Now let's sort it out based on the datasheet idea.I. Basic knowledge of clockThe seventh part is "clock Power Management", which is summarized as follows:1 The Clock Power Management Module of S3C2410 consists of three parts: clock control, USB control, and power control. The curren

Primetime automatically track the inverter and buffer in the clock tree to get the clock sense for each register.If the clock tree is only buffer and inverter, the clock signal that arrives at the register clock can be represented as "unate".Positive unate:rising Edge's

1. The relationship between the system clock and the kernel WinCE 5.0 uses a time-slice-based preemptive multi-tasking real-time kernel, and each thread can set its own thread time slice size (refer to the Cesetthreadquantum function), the default is 100ms, This default value, Dwdefaultthreadquantum, can also be set at Oeminit (). In the kernel source file, the variable name associated with the word quantum is generally referred to as a time slice, an

First, background:Recently, a project has been taken over, the core chip is both the LPC17XX series MCU, core arm of the COTEX-M3 core.If you want to play with an MCU, you have to take care of its clock!The clock is to the MCU, like the human heart. It gives the AHB, APB Bus The blood (clock frequency), and the devices that hang on the AHB (Advance High bus) bus

First, in the STM32, there are five clock sources for HSI,HSE,LSI,LSE,PLL. The ①HSI is a high-speed internal clock with an RC oscillator at a frequency of 8MHz. The ②HSE is a high-speed external clock that can be connected to a quartz/ceramic resonator or to an external clock source with a frequency range of 4mhz~16mhz