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A NE555 runs out of sync very fast, so it is not that usable as a clock long term. If you want that you would need further components you don’t need for a paduk MCU which is like 3 cents

A NE555 runs out of sync very fast, so it is not that usable as a clock long term. If you want that you would need further components you don’t need for a microcontrollers which alone is like 3 cents

A NE555 runs out of sync very fast, so it is not that usable as a clock

A SP555 runs out of sync very fast, so it is not that usable as a clock