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单片机编程  学51单片机之C51基础知识

带您从零学51单片机之C51基础知识 C51基础知识1 单片机的汇编(ASM)和C语言优缺点2 C51程序结构3 数据与数据类型4 常量与变量5 C51接口与位变量定义6 &nbsp;C51运算符、表达未及其规则7 &nbsp;C51流程控制结构及相关语句8 &nbsp;C51构造数据类型9 C51函数10 C51模块化写法 ...

https://www.eeworm.com/dl/502/30760.html

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单片机编程  S51编程器制作包

S51编程器制作包:自制AT89S51编程器教程AT89S51芯片的日渐流行，对我们单片机初学者来说是一个大好消息。因为做个AT89S51编程器非常容易，而且串行编程模式更便于做成在线编程器，给频繁烧片，调试带来了巨大的方便。电路：只要焊13根线就可以搞定这个电路。基本原理：RST置高电平，然后向单片机串行发送编程命令。P1.7( ...

https://www.eeworm.com/dl/502/30881.html

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单片机编程  X-tal oscillators on 8-bit mic

<Almost since the introduction of microcontrollers as electronic components there always has been an oscillatorcircuit on the device to make it work. From application point of view only some external components wererequired to make it work. However, to make sure that it will always work required mor ...

https://www.eeworm.com/dl/502/30992.html

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单片机编程  PCA9538 8bit I2C bus and SMBus

The PCA9538 is a 16-pin CMOS device that provides 8 bits of General Purpose parallelInput/Output (GPIO) expansion with interrupt and reset for I2C-bus/SMBus applicationsand was developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders.I/O expanders provide a simple solution when ad ...

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单片机编程  PCA9672 Remote 8-bit IO expand

The PCA9672 provides general purpose remote I/O expansion for most microcontrollerfamilies via the two-line bidirectional bus (I2C-bus) and is a part of the Fast-mode Plusfamily.The PCA9672 is a drop-in upgrade for the PCF8574 providing higher Fast-mode Plus(Fm+) I2C-bus speeds (1 MHz versus 400 kHz ...

https://www.eeworm.com/dl/502/31019.html

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单片机编程  PCA9674 PCA9674A Remote 8-bit

The PCA9674/74A is a drop-in upgrade for the PCF8574/74A providing higher Fast-modePlus I2C-bus speeds (1 MHz versus 400 kHz) so that the output can support PWMdimming of LEDs, higher I2C-bus drive (30 mA versus 3 mA) so that many more devicescan be on the bus without the need for bus buffers, highe ...

https://www.eeworm.com/dl/502/31023.html

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单片机编程  8-bit I2C-bus and SMBus IO port with reset

The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus and I2C-bus applications. The PCA9557 consists of an 8-bit input port register, 8-bit output port register, and an I2C-bus/SMBus interface. It has low current consumption and a high-impedance open-dra ...

https://www.eeworm.com/dl/502/31025.html

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单片机编程  RSM-4055 8通道隔离数字量输入输出模块

RSM-4055 是带隔离的数字量输入输出模块。模块有8 路隔离数字量输入，8 路隔离数字量输出。数字量输入可支持开关触点信号或电平信号，数字量输出采用开漏输出，最大负载可达50V，50mA，同时模块的DI 通道还具有计数功能，能对小于2kHz 的数字脉冲信号进行计数，DI 输入检测和计数都具有数字滤波功能能有效滤掉干扰信号，数 ...

https://www.eeworm.com/dl/502/31045.html

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单片机编程  3-V TO 5.5-V MULTICHANNEL RS-2

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-23 ...

https://www.eeworm.com/dl/502/31075.html

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单片机编程  8-bit IC and SMBus IO Port wit

The CAT9534 is an 8-bit parallel input/output portexpander for I&sup2;C and SMBus compatible applications.These I/O expanders provide a simple solution inapplications where additional I/Os are needed: sensors,power switches, LEDs, pushbuttons, and fans.The CAT9534 consists of an input port register, ...

https://www.eeworm.com/dl/502/31107.html

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