Adds the memory byte into an 8-bit accumulator.

        source code forms: ADDA P; ADDB P

        CC bits "HNZVC": aaaaa

def instruction_ADD8(self, opcode, m, register):
        """
        Adds the memory byte into an 8-bit accumulator.

        source code forms: ADDA P; ADDB P

        CC bits "HNZVC": aaaaa
        """
        assert register.WIDTH == 8
        old = register.value
        r = old + m
        register.set(r)
#         log.debug("$%x %02x %02x ADD8 %s: $%02x + $%02x = $%02x" % (
#             self.program_counter, opcode, m,
#             register.name,
#             old, m, r
#         ))
        self.clear_HNZVC()
        self.update_HNZVC_8(old, m, r)