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Number of I/O ports in the 8051 microcontroller?

a) 3 ports
b) 4 ports
c) 5 ports
d) 4 ports with last port having 5 pins

Answer: b
Explanation: It has 4 ports with port0 act as I/O port and also multiplexing of address and data bus. Port1act as I/O port. Port 2 act as I/O and also like address lines. Port 3 act as I/O and also for external peripherals.

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