基于AT89S51的简易数字逻辑分析仪，可设置单击触发字，具备3级逻辑状态分析触发功能，在示波器上显示可移动的时间标志线-AT89S51 figure based on simple logic analyzer can be set to trigger click character with three logic state analysis of the trigger function, showed up at Oscil

基于C8051F系列单片机的PCA8574程序-Based on the PCA8574 procedures C8051F MCU