untrasonic code using at89c51




File list:
CODE
...\24cxx.c
...\24CXX.h
...\24cxx.LST
...\24cxx.OBJ
...\bao.bin
...\code
...\CODE.hex
...\CODE.lnp
...\CODE.M51
...\CODE.MAP
...\code.Opt
...\CODE.opt.bak
...\CODE.plg
...\CODE.SBR
...\code.Uv2
...\CODE.Uv2.bak
...\CODE.uvopt
...\CODE.uvproj
...\code_Opt.Bak
...\code_Uv2.Bak
...\main.c
...\main.LST
...\main.OBJ
...\SONIC
...\SONIC.hex
...\SONIC.lnp
...\SONIC.M51
...\SONIC.Opt
...\SONIC.plg
...\SONIC.Uv2
...\SONIC_Opt.Bak
...\SONIC_Uv2.Bak
...\STARTUP.A51
...\STARTUP.LST
...\STARTUP.OBJ
...\TEST.C
...\TEST.LST
...\TEST.OBJ
...\timer.c
...\timer.h
...\timer.LST
...\timer.OBJ