左右循环的跑马灯
................\pmd
................\pmd.hex
................\pmd.lnp
................\pmd.M51
................\pmd.Opt
................\pmd.plg
................\pmd.Uv2
................\pmd_Opt.Bak
................\pmd_Uv2.Bak
................\STARTUP.A51
................\STARTUP.LST
................\STARTUP.OBJ
................\单片机跑马灯.asm
................\单片机跑马灯.LST
................\单片机跑马灯.OBJ