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Number of I/O ports in the 8051 microcontroller?

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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

I had been asked this question in class test.

My doubt stems from Microcontroller (8051) topic in division Prototyping Embedded Devices of IOT

1 Answer

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The correct answer is (b) 4 ports

To elaborate: 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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