A.2B.20C.50D.5
A.OUT 60H,AL B.OUT 61H,AL C.OUT 62H,AL D.OUT 63H,AL
A.6個16位計數(shù)通道 B.3個16位計數(shù)通道 C.6個8位計數(shù)通道 D.3個8位計數(shù)通道