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Module 2: The 8051 Architecture

20202m

Why are the resonators not preferred for an oscillator circuit of 8051?
(i) Because they do not avail for 12 MHz higher order frequencies
(ii) Because they are unstable as compared to quartz crystals
(iii) Because cost reduction due to its utility is almost negligible in comparison to total cost of microcontroller board
(iv) All of the above

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Answer: (iv) All of the above

Explanation: Crystal oscillators (quartz) are preferred over ceramic resonators for 8051 because:

  1. Ceramic resonators are available with lower frequency accuracy and do not reliably offer 12 MHz and higher frequencies with required stability.
  2. Resonators are less stable over temperature and aging compared to quartz crystals, causing baud-rate and timing errors.
  3. The cost saving of a resonator vs crystal is negligible compared to overall MCU board cost, so there is no compelling cost advantage.
    Hence all statements are true, resonators are not preferred.

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