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The number of LEDs that can be connected to a port of 8051, if all are expected to glow simultaneously is

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The number of LEDs that can be connected to a port of 8051, if all are expected to glow simultaneously is

(a) 6

(b) 8

(c) 10

(d) 12

The question was asked at a job interview.

Origin of the question is Interfacing With 8051 Ports -2 in division Microcontroller 8051 of Microprocessor

1 Answer

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by (49.2k points)
The correct option is (b) 8

Explanation: If 8 LEDs are connected to a port of 8051, and if all are expected to glow simultaneously, the total current sinked by the 8051 port will be 8×8=64 mA (since min voltage for an LED to glow=8 mA) which is less than the maximum 71 mA.

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