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 pinsI had been asked this question in class test.My doubt stems from Microcontroller (8051) topic in division Prototyping Embedded Devices of IOT

Number of I/O ports in the 8051 microcontroller?(a) 3 ports(b) 4 ports

1.	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 pinsI had been asked this question in class test.My doubt stems from Microcontroller (8051) topic in division Prototyping Embedded Devices of IOT
Answer» 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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