The ultrasonic ranging program written in assembly code, high precision, 12M crystal up to 1mm, a slight modification can be a high-precision pulse-width measurement procedures, with a simulation map.

超声波测距(1mm精度)\超声波测距.ASM
...................\超声波测距.DSN
...................\超声波测距_Opt.Bak
...................\超声波测距_Uv2.Bak
...................\STARTUP.A51
...................\超声波测距.plg
...................\超声波测距.Opt
...................\超声波测距.LST
...................\超声波测距.OBJ
...................\超声波测距.M51
...................\Last Loaded 超声波测距.DBK
...................\超声波测距
...................\超声波测距.hex
...................\超声波测距.Uv2
...................\超声波测距.PWI
...................\超声波测距开发文档.doc
超声波测距(1mm精度)

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