1734-TOP3S

1734-TOP3S

1734-TOP3S

1734-TOP3S

 SPI有主、从两种工作模式，主机的发送与从机地接收相连，主机的接收与从机的发送相连，主机产生的时钟信号要输出至从机的时钟引脚上。这时用到SPI的4个引脚：SPISIMO——主机为发送，从机为接收；SPISOMI——主机为接收，从机为发送；SPICLK——串行外设接口时钟，主机是输出时钟，从机是输入时钟；SPISTE——串行外设接口选通，选通从机。

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SPI的结构通过两类寄存器来体现：数据类寄存器和控制类寄存器。数据类寄存器包括发送数据寄存器SPIDAT，接收数据寄存器SPIBUF和仿真寄存器SPIEMU；控制类寄存器包括SPI配置控制寄存器SPICCR，操作控制寄存器SPICTL，状态寄存器SPISTS，波特率寄存器SPIBRR，端口控制寄存器SPIPC1和SPIPC2，中断优先级控制寄存器SPIPR1。
  数据类寄存器是CPU与串行外设数据交换的桥梁，读写数据类寄存器即可实现通信。由于SPI通过一根时钟引线将主机和从机同步，因此它的串行数据交换不需要增加起始位，终止位等用于同步的格式位，直接将要传送的信息（1到8位的数据）写入SPIDAT，这个写入自动启动了发送过程即在同步时钟SPICLK的节拍下把SPIDAT的内容从高位到低位一位一位移到引脚SPISIMO，完成后将置中断标志SPIINT FLAG（SPISTS.6）来通知主机信息块已发送完毕。从机接收数据与此一样，只是会将从SPISIMO引脚接收到的内容复制到接收数据寄存器SPIBUF。
  控制类寄存器规定SPI的工作方式，串行访问的参数和响应标志等，这需要在软件中进行初始化设置，因此要了解控制寄存器的使用方法。
  SPICCR.7位SPI SW RESET是软件复位位，置1将使标志位SPIINT FLAG和RECEIVER OVERRUN清零，但其他配置参数不变，此时发送停止。复位完成后，要将此位清零，已准备进行正常的工作。SPICCR.6位CLOCK POLARITY与SPICTL.3位CLOCK PHASE配合产生四种时序（见表1）。

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FEDERAL PACIFIC ELECTRIC BUSWAY UNIT 60AMP 

652-8-3000 ATC-TENOR TIMER

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