PIT延时，51有典型的定时器中断，MC9SXS128也可以有这样的定时器中断，就是PIT中断，里面有初始化，还延时，还有注释-he PIT delay, 51 had typical timer interrupt, MC9SXS128 may also have such timer interrupt, PIT is interrupted, there are initialization, also delay, as well as the notes