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Microprocessors & Microcontrollers8051 I/O

How many parallel I/O ports are provided by the classic 8051?

  • A2
  • B3
  • C4
  • D8
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Correct Answer: C. 4
Explanation: The classic 8051 provides four 8-bit ports: P0, P1, P2 and P3.
Reference: Standard microprocessors and microcontrollers: 8051 i/o
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