摘要
采用传统串口(RS232、RS485)或者并口作为MCU控制的存储器的接口,存在传输速度与占用系统资源之间的矛盾。传统串口和并口在系统传输数据时始终需要通过MCU来完成,占用CPU大量时间,使得传输效率很低。新型通用串行总线USB为数据传输提供了一种不同于传统MCU系统的新的方式。利用USB,使用DMA方式,可以实现较传统方式更有效、更经济、更快速方便的数据传输。
There exists a contradiction between transfer speed and system resources possessed by interface when using traditional serial interface(RS232、RS485) or parallel interface as the interface between memory and PC controlled by MCU. The system always transfers data via MCU and occupies lots of CPU's time. The transfer is very inefficient. Universal Serial Bus (USB) provides a new method for data transfer that is different from traditional MCU system. Using USB and DMA mode, the data transfer is more effective, economic, faster and convenient than traditional method. In this paper, we have a statement about the method that uses USB and DMA mode for fully autonomous data transfer between memory and PC.
出处
《电子器件》
CAS
2003年第3期295-299,共5页
Chinese Journal of Electron Devices
