CLR8
#define CLR8(reg, bit) PUT8(reg, GET8(reg) & ~(bit))
#define CLR8(dev, offset, v) PUT8(dev, offset, GET8(dev, offset) & ~(v))
#define CLR8(dev, offset, v) PUT8(dev, offset, GET8(dev, offset) & ~(v))
#define CLR8(dev, offset, v) PUT8(dev, offset, GET8(dev, offset) & ~(v))
#define CLR8(ss, reg, mask) PUT8(ss, reg, GET8(ss, reg) & ~(mask))