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Can a bit-manipulation instruction be executed on the port?

Latest Updated:03/18/2009

Question:

When a particular bit of an I/O port is specified as an o/p port can a bit-manipulation instruction be executed on that port ?

Answer:

Yes. The port data registers (DRs) can be read or written to at any time and can be manipulated with bit-manipulation instructions.The data direction registers (DDRs) are write-only registers and so cannot be manipulated with bit-manipulation instructions.
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