This design with AT89S52 MCU as the core design make full use of the hardware resources of a kind of frequency meter, the frequency meter will first measured signal amplification plastic processing, become meet SCM I/O port to accept TTL/CMOS compatible signal directly MCU T1 input port input accumulative pulse number, MCU internal timer timing for 1 s, then the number of pulses accumulation is the measured signal frequency. Finally by the single chip to the LCD display shows.

6-07数字频率计
..............\1-01
..............\1-01.M51
..............\1-01.hex
..............\1-01.lnp
..............\1-01.plg
..............\Last Loaded 数字频率计.DBK
..............\code.LST
..............\code.OBJ
..............\code.c
..............\数字频率计.DSN
..............\数字频率计.Opt
..............\数字频率计.PWI
..............\数字频率计.Uv2
..............\数字频率计_Opt.Bak
..............\数字频率计_Uv2.Bak

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