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The BCLR instruction clears any bits whose positions are designated by a 1 in the mask. The BSET instruction sets any bits whose positions are designated by a 1 in the mask. The following code sets bit 7 of location VAR1, then clears the same bit.
VAR1: DC.B $3C
BSET VAR1,$80 ; set bit 7 = OR VAR1 and $80
BCLR VAR1,$80 ; clear bit 7 = AND VAR1 and $7F