将 "清零" 置为高电平可将 Q 置为 0;
将 "预设" 置为高电平可将 Q 置为 1;
注: 如果两者同为高电平, 则清零占优, 应避免同时出现
其余操作同上
https://cc.xiaogd.net/?startCircuitLink=https://book.xiaogd.net/code-hlchs-examples/assets/circuit/code-hlchs-ch14-20-edge-triggered-d-type-flip-flop-with-preset-and-clear.txt
操作同上
https://cc.xiaogd.net/?startCircuitLink=https://book.xiaogd.net/code-hlchs-examples/assets/circuit/code-hlchs-ch14-21-edge-triggered-d-type-flip-flop-with-preset-and-clear-model.txt
