circuit software

we often liken the crystal to the heart of the digital circuit, this is because all the work of the digital circuit can not be separated from the clock signal, the crystal directly control the entire system, if the crystal oscillator does not work then the whole system is also paralyzed, so the crystal oscillator is to determine the digital circuit to begin work

Tags: etc struct oid return i++ vector queue CPP PACStrict short-circuit template, with two arrays to maintain the shortest and minor short-circuit, with Dijskstra, each update of the time to update the shortest circuit and then update the secondary short-circuitWrote SPFA version of Don't know why wrong ... #include #include #include using namespaceStdConst i

 UDQM, LDQM: Data input and output shielding pin.Used to control output buffering in read mode and to mask input data in write mode.LDQM,UDQM these signal lines are for byte access and half-word access, LDQM control low eight-bit, UDQM control high eight-bit, so when to write in bytes, the high eight-bit screen off.This paper introduces the addressing principle of SDRAM before the design of SDRAM circuit. SDRAM inside is a storage array, you can th

, the crystal should be careful to avoid placing the temperature changes in the position, avoid frequency offset, while away from the source of interference. In a 4pin package, it is best to ground the housing angle to prevent EMI problems.The crystal waveform of a SOC is measured below.Xtal_in waveforms such as:Xtal_out waveforms such as:It can be seen that the waveform amplitude of xtal_in is small and not distorted. The waveform amplitude of the xtal_out is large and distorted.The reason is t

MP1584 step-down converter Buck converter produced by the US-sourced semiconductor http://www.monolithicpower.com/. Its core is buck conversion! The following is an analysis of the buck circuit.The buck Circuit also belongs to the switching power supply. By adding a switching signal PWM to the MOS tube Q to control the on and off of the switching tube, the inductor and capacitor charge and discharge, the diode used here is the Schottky diode, which i

Today I looked at the third edition of Java programming ideas. When I talked about logical operators in Chapter 3, I mentioned a short-circuit ranking I have never heard of before. What is short-circuit? Let's take a look at the followingCode Public Class Shortcut { Public Static Boolean Test ( Int A) {System. Out. println ("Come in and a ="+A );ReturnA>1;} Public Static Voi

at most Dumb Zhang cut off Innocent Wu still have the chance to catch Dumb Zhang.Inputthere is multiple test cases. Please process till EOF.For each case,the first line must includes the integers, N (In the following M lines, every line must includes three numbers, and use AI, Bi, Li as channel i connecting Chamber AI and Bi (1The entrance of the tomb is at the chamber one, and the end of tomb is at the chamber N.Outputoutput numbers to stand for the answers of Dumb Zhang and Innocent Wu ' s qu

A*+SPFA algorithm:(1) The forward and reverse of all sides of the forward graph are deposited into two different Bong (EDGES,EDGES1) respectively. Using the inverse edge set, the shortest path from all points to T is solved by using SPFA or Dijkstra, with the end point T as the source point, and the shortest distance of point I points t is represented by the Dist[i] array.(2) Establish a priority queue and add the source point s to the queue.(3) Remove the smallest point p from the priority queu

Learn the PBOC debit and credit application terminal standard documents and explain the terms. ApplicationApplication protocols and related datasets between cards and terminals. CommandA message sent from a terminal to an IC card. The message initiates an operation or requests a response.Ciphertext cryptogramThe result of the encryption operation.Financial transactionMessages generated between the card holder, the card issuer, the merchant, and the receiving bank due to the exchange of goods or

Write at the beginningIn the Springcloud project, calls are made between services (RPC remote Procedure call-Remote Procedure calls), and when a service that is at the bottom of the calling link becomes unavailable, the request generates a heap that blocks the server thread and even causes the server to crash. A circuit breaker is a way to solve a service unavailability problem.Body StartThis article is based on the third piece of code, the introducti

Brief introductionSpring Cloud provides a hystrix fault-tolerant library to temporarily invoke an alternate method when the service is unavailable, and a downgrade strategy is implemented for the method that configures the circuit breaker. This article creates a product microservices, registers to the Eureka Service registry, and then we use the Web Client Access /products API to obtain a list of products that, when a product service fails, calls the

Codevs1269 Hungarian Games The update becomes 3 cases:1. Shortest path update;2. The shortest circuit can not update the shortest-circuit but update the secondary short-circuit;3. Minor short Circuit update secondary short circuit. Think about it, it's obvious. #include

Title Link: http://poj.org/problem?id=3255 Test Instructions: give you a graph, consisting of n points, M-bar without side, let you find a short-circuit from vertex 1 to vertex N, secondary short-circuit refers to the shortest short path than the shortest time Resolution: Suppose to find a vertex v short-circuit, then there will certainly be two cases, one is t

Originally thought a A * will be difficult to understand ~ ~ ~ The result of the Fox big Breath to me to understand a * and K short-circuit of the method .... The so-called a * is the inspiration is search. The plain is to search the BFS a sequence to make the search more reasonable to reduce unnecessary search. How to determine the order of searches ... That is, a value is used to denote this value as f[x]. Every search takes f[x] the smallest expans

The transistor is a current amplifier, which has three poles, namely the collector C, the Base B, and the emission pole E. It can be divided into two types. The basic principle of the transistor amplifier circuit is described in this example. The following analysis is only applicable to the silicon transistor. As shown in, we call the current from base B to the emission pole e the base current IB, and the current from the collector C to the emission

1. Positive Feedback and negative feedback of the amplifier. In circuit design, the negative feedback is drawn into positive feedback. From the derivation of the principle formula, the results should be the same, but the measurement process will find that, the output end of positive feedback is always from 11 ~ Between 12 V (the power supply voltage of the amplifier is +-12 V). This is because the input and output of positive feedback always follow th

Icsp Interface Circuit Online serial programming icsp is one of the features of the PIC microcontroller.ProgramDirectly burn it into a single-chip microcomputer, and conduct online serial programming and debugging on the single-chip microcomputer. There are only five lines of the icsp interface circuit, which are VPP, VDD, VSS, PGD, and PGC in sequence. their connection with the PIC microcontroller is as

This article mainly introduces the short-circuit expression of Javascript optimization techniques. This article describes what short-circuit expressions are and provides some examples. For more information, see What is short circuit expression? Short-circuit expression: Used as the operand expressions of the "" and "|