Before key pressed what send the key bord to the microcontroller

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samikshya samal

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Here ps2 keybord interface with microcontroller,when ps2 keybord get the signal ,before key pressed sda line low for microsecond .I want to know what is the behavior of ps2 keybord before key pressed & what send to the microcontroller.In this program at89s52 microcontroller & 6-pin ps2 conecator use.
 

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