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A read bit can be read

  1. and written by CPU
  2. and written by peripheral
  3. by peripheral and written by CPU
  4. by CPU and written by the peripheral
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I think answer is option D.

Every peripheral device is controlled by writing and reading its registers

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The read and write functionality depends on the type of microcontroller peripheral. Generally, the status bits have a read only status and can be modified by peripherals only. So, read bit can be read by CPU and written by the peripheral.

So, option (d) is right
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