单项选择题
A.8根 B.13根 C.16根 D.20根
A.IP B.PCON C.IE D.SCON
A.1μs;8192μs B.1μs;255μs C.2μs;255μs D.1μs;65.536ms
A.0FFH B.00H C.0F0H D.0FH
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