Advanced Embedded Systems Interview Question:

Explain me which port in 8051 performs a dual role?

Submitted by: Muhammad

☛ The port 3 can be used as simple input /output port or provides signals like interrupts.
☛ P3.0 and p3.1 are used for serial communication.
☛ P3.2 and P3.3 are used as external interrupts.
☛ P3.4 and P3.5 are used for timers.
☛ P3.6 and P3.7 are used as read write signals of external memory.
Submitted by: Muhammad