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有谁知道28335的XR/~W和/XRD的区别?即148脚和149脚区别?
XR/~W为读周期或写周期的选择,/XRD为读有效标志,/XWE为写有效标志。XR/~W先于读写有效信号动作。具体请查看手册的XINTF的时序图。