| 摘要 |
PURPOSE:To reduce the firmware capacity and to shorten the exception processing time by providing a switching means which can change the indication of direction for increase or decrease updating with the register updating informationheld by a holding means by an exception signal between the holding means and a constant generating means. CONSTITUTION:A register updating mechanism consists of a register qualifying means 1, a register part 2, a register selecting circuit 3, a holding means 4, a constant generating means 5, an adder 6 and a switching means 7. The means 7 supplies an exception signal 10 through an exception detecting circuit to show the presence or absence of an exception. The circuit 3 selects a register out of the part 2 and connect it to the adder 6 via a bus when the signal 10 applied via an OR circuit 12 or a register replacement signal 11 is active. |
