Figure 4.3.1 below, AT89S51 MCU P1.0-P1.3 next four light-emitting diodes L1-L4, P1.4-P1.7 next four switches K1-K4, programming will switch state reflected in the light-emitting diodes. (Switch closed, the corresponding lights, switch off, the corresponding lights out).

3.多路开关状态指示
..................\3. 多路开关状态指示.doc
..................\Keil-C1
..................\.......\state
..................\.......\state.c
..................\.......\state.hex
..................\.......\state.lnp
..................\.......\state.LST
..................\.......\state.M51
..................\.......\state.OBJ
..................\.......\state.Opt
..................\.......\state.plg
..................\.......\state.Uv2
..................\.......\state_Opt.Bak
..................\.......\state_Uv2.Bak
..................\Keil-C2
..................\.......\state
..................\.......\state.c
..................\.......\state.hex
..................\.......\state.lnp
..................\.......\state.LST
..................\.......\state.M51
..................\.......\state.OBJ
..................\.......\state.Opt
..................\.......\state.plg
..................\.......\state.Uv2
..................\.......\state_Opt.Bak
..................\.......\state_Uv2.Bak
..................\Keil-H1
..................\.......\state2
..................\.......\state2.asm
..................\.......\state2.hex
..................\.......\state2.lnp
..................\.......\state2.LST
..................\.......\state2.M51
..................\.......\state2.OBJ
..................\.......\state2.Opt
..................\.......\state2.plg
..................\.......\state2.Uv2
..................\.......\state2_Opt.Bak
..................\.......\state2_Uv2.Bak
..................\Keil-H2
..................\.......\state
..................\.......\state.asm
..................\.......\state.hex
..................\.......\state.lnp
..................\.......\state.LST
..................\.......\state.M51
..................\.......\state.OBJ
..................\.......\state.Opt
..................\.......\state.plg
..................\.......\state.Uv2
..................\.......\state_Opt.Bak
..................\.......\state_Uv2.Bak
..................\Last Loaded state.DBK
..................\state.DSN
..................\state.PWI

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