单片机PROTEUS仿真实例，（行列键盘、DS1302时钟、7221动态显示、ram扩展、串口、播放音乐、汉字点阵、俄罗斯方块、流水灯、走马灯等）-SCM PROTEUS simulation instance, (the ranks of the keyboard, DS1302 clock, 7221 dynamic display, ram expansion, serial, music, character dot-matrix, Tetris, water lamp, lantern