Machine cycle

The steps performed by the computer processor for each machine language instruction received. The machine cycle is a 4 process cycle that includes reading and interpreting the machine language, executing the code and then storing that code.

IAP(In-Application Programming)

是单片机应用的新技术,可以实现用户应用程序对FLASH存储器编程、擦除和读存储器等功能,但是,使用单片机高级语言C51编程开发应用程序时不容易直接调用IAP功能.

SPI接口

的全称是"Serial Peripheral Interface",意为串行外围接口,是Motorola首先在其MC68HCXX系列处理器上定义的。SPI接口主要应用在EEPROM, FLASH,实时时钟,AD转换器,还有数字信号处理器和数字信号解码器之间。
      SPI接口是在CPU和外围低速器件之间进行同步串行数据传输,在主器件的移位脉冲下,数据按位传输,高位在前,低位在后,为全双工通信,数据传输速度总体来说比I2C总线要快,速度可达到几Mbps。

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