In electronics, a four-bit binary counter which has been modified to countfrom0 to9 and then reset to0. Normally, a four bit binary counter would increment up to1111(decimal15) before returning to0.

• 电子学中，一种四位二进制记数器，其计数改变为从0到9再到0。通常，一个四位二进制计数器在返回到0之前可增加到1111（即十进制的15）。