An electronic circuit having two stable states, one input line and one output line, such that as each successive pulse is received, the output line changes between two alternative condition, e. g., high to low or off to on.

• 一种具有两个稳定状态的电子电路,一个输入线,一个输出线,当收到每个相继脉冲时,输出线在两个状态间变化,例如从高电平变到低电平,或从断开变到导通。