a multifunctional keys recognition technology shown in Figure 4.9.1. Switching SP1 Then in P3.7/RD pin, in AT89S51 P1 port MCU has been followed by four light-emitting diode, the power, Then in L1 P1.0 pin of LEDs in scintillation, every time? Switches SP1, Then in L2 P1.1 pin of LEDs in scintillation and pressing switches SP1, L3 Then in P1.2 pin of LEDs in scintillation and pressing switches SP1, L4 Then in P1.3 pin of LEDs in scintillation and pressing switches SP1, Also at the turn of L1 flashing, rotating so on.

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