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With what frequency UART operates( where f denoted the crystal frequency )?

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With what frequency UART operates( where f denoted the crystal frequency )?

(a) f/12

(b) f/32

(c) f/144

(d) f/384

I got this question in an internship interview.

I would like to ask this question from Serial Port Communication topic in portion 8051 Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
The correct answer is (d) f/384

For explanation: UART frequency is the crystal frequency f/12 divided by 32, that comes out to be f/384.

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