单片机实现的CRC校验，特别针对PPP协议验证过。 多项式是：CRC16-CCITT x16+x12+x5+1

单片机实现的CRC校验，特别针对PPP协议验证过。多项式是：CRC16-CCITT x16+x12+x5+1-Singlechip realize the CRC checksum, with special reference to PPP agreements verified. Polynomial is: CRC16-CCITT x16+ X12+ X5+ 1

CRC16-CCITT的算法实现，包括数据流低位先发和数据流高位先发时的两种算法。在这种算法在通信系统经常用到。-It is an implementation of CRC16-CCITT,including two type of algorithm when both the LSB and MSB of data stream transmitted.