NEC 16位MCU参考手册 The 78K0R/IC3 is a 16-bit single-chip microcontroller that uses a 78K0R CPU core and incorporates peripheral functions, such as ROM/RAM, a multi-function timer, a multi-function serial interface, an A/D converter, a programmable gain amplifier (PGA), a comparator, a real-time counter, and a watchdog timer.
上传时间： 2013-11-02
上传用户：努力努力再努力
This application report discusses the design of non-invasive optical plethysmographyalso called as pulsoximeter using the MSP430FG437 Microcontroller (MCU). Thepulsoximeter consists of a peripheral probe combined with the MCU displaying theoxygen saturation and pulse rate on a LCD glass. The same sensor is used for bothheart-rate detection and pulsoximetering in this application. The probe is placed on aperipheral point of the body such as a finger tip, ear lobe or the nose. The probeincludes two light emitting diodes (LEDs), one in the visible red spectrum (660nm) andthe other in the infrared spectrum (940nm). The percentage of oxygen in the body isworked by measuring the intensity from each frequency of light after it transmitsthrough the body and then calculating the ratio between these two intensities.
标签： Pulsoximeter Single-Chip Des
上传时间： 2013-10-27
上传用户：黑漆漆
数字时钟应用资料 单片计算机即单片微型计算机。（Single-Chip Microcomputer ）,是 集CPU ,RAM ,ROM ,定时，计数和多种接口于一体的微控制器。他体积小，成本低，功能强，广泛应用于智能产品和工业自动化上。而51 单片机是各单片机中最为典型和最有代表性的一种。这次毕业设计通过对它的学习，应用，从而达到学习、设计、开发软、硬的能力。
上传时间： 2013-10-13
上传用户：zhqzal1014
本文介绍了一种基于单片机的健身车转速测量系统。该系统具有电路简单、使用方便等特点。文中详细介绍了该系统的工作原理,并且给出了它的硬件原理图和软件设计程序框图。关键词:转速 单片机 测量ABSTRACT :This paper introduces a measuring system of the rotational velocity of exercise bike based on single - chip microcomputer . It has such advantages : simple circuit ,convenient use and so on. The work principle is presented in detail in this paper and the block diagram of hardware and program flow chart are giv2 en as well .KEYWORDS :Rotational velocity Single - chip microcomputer Measuring
上传时间： 2013-11-02
上传用户：源弋弋
自动检测80C51串行通讯中的波特率:本文介绍一种在80C51 串行通讯应用中自动检测波特率的方法。按照经验，程序起动后所接收到的第1 个字符用于测量波特率。这种方法可以不用设定难于记忆的开关，还可以免去在有关应用中使用多种不同波特率的烦恼。人们可以设想：一种可靠地实现自动波特检测的方法是可能的，它无须严格限制可被确认的字符。问题是：在各种的条件下，如何可以在大量允许出现的字符中找出波特率定时间隔。显然，最快捷的方法是检测一个单独位时间（single bit time），以确定接收波特率应该是多少。可是，在RS-232 模式下，许多ASCII 字符并不能测量出一个单独位时间。对于大多数字符来说，只要波特率存在合理波动（这里的波特率是指标准波特率），从起始位到最后一位“可见”位的数据传输周期就会在一定范围内发生变化。此外，许多系统采用8 位数据、无奇偶校验的格式传输ASCII 字符。在这种格式里，普通ASCII 字节不会有MSB 设定，并且，UART总是先发送数据低位（LSB），后发送数据高位（MSB），我们总会看见数据的停止位。在下面的波特率检测程序中，先等待串行通讯输入管脚的起始信号（下降沿），然后起动定时器T0。在其后的串行数据的每一个上升沿，将定时器T0 的数值捕获并保存。当定时器T0溢出时，其最后一次捕获的数值即为从串行数据起始位到最后一个上升沿（我们假设是停止位）过程所持续的时间。
上传时间： 2014-08-22
上传用户：dajin
The TRS232E is a dual driver/receiver that includes a capacitive voltage generator to supply TIA/RS-232-Fvoltage levels from a single 5-V supply. Each receiver converts TIA/RS-232-F inputs to 5-V TTL/CMOS levels.This receiver has a typical threshold of 1.3 V, a typical hysteresis of 0.5 V, and can accept ±30-V inputs. Eachdriver converts TTL/CMOS input levels into TIA/RS-232-F levels. The driver, receiver, and voltage-generatorfunctions are available as cells in the Texas Instruments LinASIC™ library.
上传时间： 2013-10-07
上传用户：waitingfy
The main oscillator allows either a crystal or single-ended input clock signal. Cost-sensitiveapplications typically use an external crystal with the on-chip oscillator circuit since it is the mostcost-effective solution. It is also possible to use the internal oscillator to clock the device after theboot process has completed.
标签： Stellaris Clocking Options for
上传时间： 2013-10-14
上传用户：pol123
The MAX3243E device consists of three line drivers, five line receivers, and a dual charge-pump circuit with±15-kV ESD (HBM and IEC61000-4-2, Air-Gap Discharge) and ±8-kV ESD (IEC61000-4-2, Contact Discharge)protection on serial-port connection pins. The device meets the requirements of TIA/EIA-232-F and provides theelectrical interface between an asynchronous communication controller and the serial-port connector. Thiscombination of drivers and receivers matches that needed for the typical serial port used in an IBM PC/AT, orcompatible. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-Vsupply. In addition, the device includes an always-active noninverting output (ROUT2B), which allowsapplications using the ring indicator to transmit data while the device is powered down. The device operates atdata signaling rates up to 250 kbit/s and a maximum of 30-V/ms driver output slew rate.
标签： MULTICHANNEL 5.5 TO RS
上传时间： 2013-10-19
上传用户：ddddddd
MCU(单片机)对可控硅的控制:交流市电控制――ＭＣＵ对可控硅的控制 郭江辛 07-23-03在用可控硅对交流市电控制中，主要注意以下几个方面：一， 同步信号 （弄不好都会产生不均匀的斩波，控制白炽灯表现为灯闪）1) 清楚同步信号在交流周期中的位置,最好在交流零点选取.在一些阻容降压对MCU 供电电路中,最好直接在交流电源两端取同步信号（过零点）,以避免计算阻容产生的象移(PHASE SHIFT)2) 同步信号要稳定二， 控制信号 （弄不好则可控硅不能通，或一直通）1） 可控硅断路时，可控硅控制极（GATE）最好是开路，没有开极的MCU可加如下电路：
上传时间： 2014-05-05
上传用户：comer1123
基于单DSP的VoIP模拟电话适配器研究与实现:提出和实现了一种新颖的基于单个通用数字信号处理器(DSP)的VoIP模拟电话适配器方案。DSP的I/O和存储资源非常有限，通常适于运算密集型应用，不适宜控制密集型应用[5]。该系统高效利用单DSP的I/O和片内外存储器资源，采用μC/OS-II嵌入式实时操作系统，支持SIP和TCP-UDP/IP协议，通过LAN或者宽带接入，使普通电话机成为Internet终端，实现IP电话。该系统软硬件结构紧凑高效，运行稳定，成本低，具有广阔的应用前景。关键词：模拟电话适配器；IP电话；数字信号处理器；μC/OS-II 【Abstract】This paper presents a VoIP ATA solution based on a single digital signal processor (DSP). DSPs are suitable for arithmetic-intensiveapplication and unsuitable for control-intensive application because of the limitation of I/O and memory resources. This solution is based on a 16-bitfixed-point DSP and μC/OS-II embedded real-time operating system. It makes good use of the limited resources, supports SIP and TCP-UDP/IPprotocol. It can connect the analog telephone to Internet and realize the VoIP application. This system has a great future for its high efficiency andlow cost.【Key words】Analog telephone adapter (ATA); Voice over Internet protocol (VoIP); Digital signal processor (DSP); μC/OS-II Research and Implementation of VoIPATA Based on Single DSP
上传时间： 2013-11-20
上传用户：Wwill
