Functions of port 3 of 8051

Explain the functions of the port 3 of 8051?

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a) Serial data input (P3.0),
b) Serial data output (P3.1),
c) External Interrupt 0 (P3.2),
d) External Interrupt 1 (P3.3),
e) External input for timer 0(P3.4), 
f) External input for timer 1 (P3.5),
g) External memory write pulse (P3.6),
h) External memory read (P3.7).

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