In electronics,a four-bit binary counter which has been modified to countfrom 0 to 9 and then reset to 0. Normally,a four bit binary counter would increment up to 1111(decimal15) before returning to 0.

• 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）。