Digital Electronics - The 8051 Microcontroller - Discussion
Discussion Forum : The 8051 Microcontroller - General Questions (Q.No. 37)
37.
The I/O port that does not have a dual-purpose role is:
Discussion:
5 comments Page 1 of 1.
Saravana kumar said:
1 decade ago
P0 & P2 have address and data lines (Dual - role).
P3 have I/O and serial, interrupt, timer role, P2, P0 have address role for external access (Dual - role).
But P1 only has data lines only.
So answer is P1.
P3 have I/O and serial, interrupt, timer role, P2, P0 have address role for external access (Dual - role).
But P1 only has data lines only.
So answer is P1.
Shameer said:
1 decade ago
All the port have i/o purpose role, but port 1 have only one role. (p3 have i/o and serial, intrpt, timer role, p2, p0 have address role for external access.
Shanmugam said:
1 decade ago
None of the above is correct because all the ports in 8051 is dual purpose role.
B.nagendra prasad said:
1 decade ago
Because P1 does not have a address and data lines.
Abmne wyojja said:
1 decade ago
All have address and data lines except P1.
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