C8051F040单片机ADC2模块的一个应用例子///ADC2调试程序，p1.2口单端输入///////////////// /////////T2定时采样，ADC2监控中断-ADC2 module is a C8051F040 MCU application examples///ADC2 debugger, p1.2-port, single-ended input ///////////////// ///////// T2 regular sampling, ADC2 interr