8051 PIN OUT
l Power - Vcc, Vss
l Reset - RST
l Crystal - XTAL[1,2]
l External device interfacing
– EA, ALE, PSEN, WR, RD
l I/O Port
– P0[7;0], P1[7:0], P2[7:0], P3
P3 is shared with control lines
– Serial I/O RxD, TxD,
– external interrupts INT0, INT1
– Counter control T0, T1
P0 and P2 are multiplexed with Address and Data bus
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