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Bit Variables ISR Safe?

Question asked by bryson.paul on Apr 24, 2015
Latest reply on Apr 27, 2015 by bryson.paul
I am using the Cosmic compiler and I want to read and write bit variables in an ISR.  I am wondering if there is a guarantee that ALL bit variable manipulations are atomic (ie using bitwise instructions).  
If not - since multiple bit variables are stored within a single byte I would have to bracket every access of every bit variable with interrupt masking.