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Of what use can a logic gate be to a circuit that contains a micro-controller

up vote 14 down vote favorite

I am wondering if a logic gate would be of use to a circuit that contains a micro-controller.Are there cases when an analog logic gate is preferred over a micro-controller and what are some of the gadgets that use analog logic gates in the age of micro-processors and controllers.

2 Answers

up vote 4 down vote accept

On one hand, "discrete" logic can perform faster and more reliably operations that could otherwise be done by a microcontroller. And, which sometimes is even more important, logic gates can operate concurrently, while a uC is inherently sequential.

Also, if you have a crowded board you can save I/O chips on the microcontroller if you can perform such operations externally.

up vote 3 down vote

Another reason: ultra low current consumption when not switching. You could use this to respond to simple input when the micro is off, or decide whether to wake it up to perform processing.


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Of what use can a logic gate be to a circuit that contains a micro-controller

up vote 14 down vote

I am wondering if a logic gate would be of use to a circuit that contains a micro-controller.Are there cases when an analog logic gate is preferred over a micro-controller and what are some of the gadgets that use analog logic gates in the age of micro-processors and controllers.


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up vote 9 down vote

On one hand, "discrete" logic can perform faster and more reliably operations that could otherwise be done by a microcontroller. And, which sometimes is even more important, logic gates can operate concurrently, while a uC is inherently sequential.

Also, if you have a crowded board you can save I/O chips on the microcontroller if you can perform such operations externally.

edit

+1 for concurrency. - Adam Head Nov 7 at 14:46

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