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The port that can source or sink 4 LS TTL inputs when being used as an output port on each of its line is

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The port that can source or sink 4 LS TTL inputs when being used as an output port on each of its line is

(a) Port 1

(b) Port 2

(c) Port 3

(d) all of the mentioned

The question was posed to me in examination.

This is a very interesting question from Interfacing With 8051 Ports -1 in chapter Microcontroller 8051 of Microprocessor

1 Answer

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by (49.2k points)
Correct answer is (d) all of the mentioned

The explanation: The ports P1, P2 and P3 can source or sink 4 LS TTL inputs when being used as an output port on each of its line.

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