http://stm32f4-discovery.com/2015/01/properly-set-clock-speed-stm32f4xx-devices/ I see that you have problems with your devices when you don’t know even (and you don’t even ask) on which speed your device is actually running. Speed of your device dep…

How do we measure a CPU's work? Whether it's fast or not depends on three factors: IPC, Hz, Clock speed. IPC means instructions per cycle, Hertz[Hz] means cycles per second and Clock speed's definition is always the large number of Hz. So if two CPUs…

;/******************** (C) COPYRIGHT 2015 STMicroelectronics ******************** ;* File Name : startup_stm32f4xx.s ;* Author : MCD Application Team ;* Version : V2.3.2 ;* Date : 26-June-2015 ;* Description : STM32F4xx devices vector table for EWARM…

system_stm32f4xx.c:This file contains the system clock configuration for STM32F4xx devices. /** ****************************************************************************** * @file system_stm32f4xx.c * @author MCD Application Team * @version V1.4.0…

http://www.howtogeek.com/177790/why-you-cant-use-cpu-clock-speed-to-compare-computer-performance/ Why You Can't Use CPU Clock Speed to Compare Computer Performance Shopping for a new computer? Don't pay too much attention to CPU clock speed. "CPU spe…

//Normal Clock Block always begin:clk_blk clk <=; # clk<=; #; end //Improved Clock Block, improve clcok speed by 25% always begin:clk_blk clk = ; clk = ~ clk; end 1.use a forever loop in the always block 2.use blocking assignment 3.improves clock sp…

RFID读写器的工作原理 RFID的数据采集以读写器为主导,RFID读写器是一种通过无线通信,实现对标签识别和内存数据的读出和写入操作的装置. 读写器又称为阅读器或读头(Reader).查询器(Interrogator).读出装置(Reading Device). 扫描器(Scanner).通信器(Communicator).编程/编码器(Programmer)等等. 读写器工作原理 RFID读写器的基本原理是利用射频信号与空间耦合传输特性,使电子标签与阅读器的耦合元件在射频耦合通道内进行能量传…

http://anandtech.com/show/2549 Now that NVIDIA’s has announced its newest GPU architecture (the GeForce GTX 200 series), interesting architectural details are popping up on the web. The best writeup I’ve found is by AnandTech. In the past, such detai…

2013-12-04 22:34:26 转自:http://processors.wiki.ti.com/index.php/Debugging_JTAG_Connectivity_Problems Contents [hide] 1 Strategy for debugging JTAG connectivity problems2 Check your hardware JTAG connection 1.1 If using Spectrum Digital emulators 1.2 I…

This 125 kHz RFID reader http://www.serasidis.gr/circuits/RFID_reader/125kHz_RFID_reader.htm http://www.serasidis.gr/circuits/RFID_reader/images/125kHz_RFID_reader_schem.GIF I will try to explain with simple words how the RFID works. The ATtiny13 use…