Frequency, amplitude, variable duty cycle square wave, and proteus simulation, can be read through the oscilloscope, adjust the frequency of 34 keys 12 to adjust the amplitude to adjust the duty cycle of 56

DAC
...\DAC
...\DAC.hex
...\DAC.lnp
...\DAC.M51
...\DAC.Opt
...\DAC.plg
...\DAC.Uv2
...\DAC_main.c
...\DAC_main.LST
...\DAC_main.OBJ
...\DAC_Opt.Bak
...\DAC_Uv2.Bak
...\display_led.c
...\display_led.h
...\display_led.LST
...\display_led.OBJ
...\IO_util.h
...\keyboard.c
...\keyboard.h
...\keyboard.LST
...\keyboard.OBJ
...\Last Loaded MSU.DBK
...\MSU.DSN
...\msu.LST
...\msu.OBJ
...\MSU.PWI
...\output_type_select.c
...\output_type_select.h
...\output_type_select.LST
...\output_type_select.OBJ
...\STARTUP.A51
...\STARTUP.lst
...\STARTUP.obj
...\utility.c
...\utility.h
...\utility.LST
...\utility.OBJ

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