Description: Function: implement PC keyboard (p/s2) and 8 single chip microcomputer connection
Principle: keyboard clock is connected to p3.2, 8051 external interrupt int0, keyboard data to p1.0
Each keystroke, the keyboard sends pulses to the single chip microcomputer to cause an external interruption, the data has p1.0 to enter a person
Return data format: 1 bit start bit (0), 8-bit data bit (press key to identify keys), 1 check bit (odd check)
End bit (1)
Implementation: put the keyboard back into a buffer (array), and when the button ends, an internal interrupt occurs to process the pressed key
Disadvantages: because of the limited capacity of 51 MCU, the buffer can not be opened too large, which can result in the number of keypads that can record the keyboard too little.
That's the fault tolerance. But you can't go wrong with a normal keyboard
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