4.177.2 bit_is_set
bit_is_set(sfr, bit)
Test whether bit bit in IO register sfr is set. This will return a 0 if the bit is clear, and non-zero if the bit is set. 
bit_is_set(sfr, bit)
Test whether bit bit in IO register sfr is set. This will return a 0 if the bit is clear, and non-zero if the bit is set. 
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