The BITRESET() function turns off a specified bit in an integer value.
The BITRESET() function converts expr to a 32 bit integer and turns off (sets to 0) the bit identified by bit to form a new integer value as the result. Bits are numbered from 0 to 31 from the least significant end of the value. The effect of this function with a bit value outside this range is undefined.
FLAGS = BITRESET(FLAGS, 2)
This statement turns off bit 2 in the FLAGS variable.