基于单片机Aduc841的调试程序，包括锁相环PLL4153的驱动和39VF040flash芯片的驱动以及通过串口和上位机通信的代码。-based SCM Aduc841 debugging procedures, PLL PLL4153 including the driver and 39 VF040flash chip and drive through the serial port and PC communications code.

ADUC841 用方式2产生PWM波。附带串口通讯，74HC244扩展P1口，PWM波，AD转换的调试报告。和程序，正常应用。-ADUC841 generate PWM wave with mode 2. With serial communication, 74HC244 extended P1 port, PWM wave, AD conversion of the debug report. And procedures for normal application.

用74HC244扩展ADUC841的IO口。此处扩展的是P1口，因为P1口不能用位寻址，应该用xdata寻址。比较有代表性。-ADUC841 the IO expansion with 74HC244 mouth. Expansion of the P1 port here, because I can not P1-bit addressing, should xdata address. More representative.