The program implements the independent button to control the LED lights off, and spoke of the right key approach. Independent buttons corresponding IO port usually is high, once the button is pressed, the microcontroller will detect low.

19独立按键\STARTUP.A51
..........\STARTUP.LST
..........\STARTUP.OBJ
..........\独立按键
..........\独立按键.c
..........\独立按键.hex
..........\独立按键.lnp
..........\独立按键.LST
..........\独立按键.M51
..........\独立按键.OBJ
..........\独立按键.Opt
..........\独立按键.plg
..........\独立按键.Uv2
..........\独立按键_Opt.Bak
..........\独立按键_Uv2.Bak
19独立按键

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