The Reset function of a register does not work properly. #24

When a reset value of a register, lets say self.regs.ROM_COS1.res() is read, instead of returning its original reset value, it returns only the 8 LSB, neglecting the 8 MSB's. This need to be corrected.

For example, ROM_COS1.res() should return 23170. But, it returns only 130 (8 LSB)