My wife and I went to a supermarket, there we bought some cold drinks and cakes. After we came out of the supermarket, we noticed that in the front of the supermarket was a nice little garden with benches for people relax on. We sat there and started enjoying the things we have just bought. There was ten small cakes in the bag and we couldn’t eat all of it. I wanted to share, but of whom? A young boy appeared. He was looking into the trashcan for nothing to eat. We had just finished three of the ten cakes. So, I took the remained pieces and gave them to him. He thanked me and ran away in a happily mood.

当Intel18251A工作在同步方式时，引脚同步检测SYNDET可作为输入或输出信号使用。若工作在外同步方式，该引脚为______：若工作在内同步方式，该引脚为