按键切换高低电平\123
................\123.c
................\123.hex
................\123.lnp
................\123.LST
................\123.M51
................\123.OBJ
................\123.Opt
................\123.plg
................\123.Uv2
................\123_Opt.Bak
................\123_Uv2.Bak
按键切换高低电平