51串行令牌格式 a51编译

Read data from serial port

　　　　and write into buffer DPTR pointed in XRAM if a data frame is

　　　　received and calculate the check sum

　　　　if a information frame is received return control byte only

-51 serial format A51 compiler Read data from a serial port nd write into buffer DPTR pointed in XRAM if a dat a frame is received and calculate the check sum i f a frame is received information return contro l byte only