一、单键或单刀多投开关与μP之接口最简单的按键开关与μP三联接图见图2—1所示。为了记忆开关X_1或X_2的状态,可以采用两个J—K触发器或双稳态触发器等记忆元件,先把状态存下来,等待μP来取用。图2—1中J—K触发器之清零端(CLR),双三端门IC1均为负跳触发。IC2、IC3、IC4为8 First, the single-button or single-pole multi-throw switch and μP interface The simplest button switch and μP three joint diagram shown in Figure 2-1. In order to memorize the state of the switch X_1 or X_2, two J-K flip-flops or bistable flip-flops can be used to save the state and wait for μP. Figure 2-1 J-K trigger reset end (CLR), double-ended gate IC1 are negative jump trigger. IC2, IC3, IC4 is 8