本PPT介绍了ARM7和ARM9的体系结构，是对常用ARM系列认知的好的学习材料-The introduction of the ARM7 and ARM9 PPT architecture is a common perception of good ARM series of learning materials

实现smartpen的功能，利用的是加速度传感器和陀螺仪实现对用动作的感知，近一步可以实现对于那个人写字的笔势的模拟。-Achieve smartpen function, using accelerometer and gyroscope perception of with movement, further can realize simulation of handwriting for that person to write.