ARM7_SendRTC_C,主要是在NXP的ARM7平台下实现实时时钟，达到一定的精度的特点，代码直接能实现，可以参考学习。-ARM7_SendRTC_C mainly NXP' s ARM7 platform real-time clock to achieve a certain degree of accuracy features, and code directly to achieve, can refer to the study.