P5OUT is ORed with BIT5 and then assigned to
P3OUT&=~BIT0
BIT0 is actually 0x0001; then P3OUT&=~BIT0; is equivalent to P3OUT=P3OUT&(~0X0001),
which is actually P3OUT=P3OUT&0XFFFE(11111111111111110), clearing the lowest bit of port P3 and keeping the other bits as they are.
BIT0: 0x0001 (0000 0000 0000 0001), ~BIT0: 0xFFFE (1111 1111 1111 1110), P3OUT and ~BIT0 are ANDed, and then assigned to P3OUT, that is, the lowest position is cleared and the other bits remain unchanged
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