说明：  This program provides an example of how to configure the C8051F02x device to operate from an external 22.1184MHz crystal attached to the XTAL1 andXTAL2 pins. Also enables Missing Clock Detector.
(This program provides an example of how to c onfigure the C8051F02x device to operate from a n external 22.1184MHz crystal attached to the X TAL1 andXTAL2 pins. Also enables Missing Clock Detector.)