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请教各位,关于DSP的IO口结构是怎样的?因为2808的IO口有个pullup的功能,想知道这个上拉是怎样实现的,应该不是简单用电阻上拉到Vdd来做的吧?是通过MOS上拉到Vdd实现的吗?
如果IO口配置为输出且pullup使能,然后在这个io口外部加上一个电阻到地。那IO口是电平是外部电阻和pullup的分压吗? 随着电阻的减小,IO口的输出电平能一直维持在Vdd吗?
请教各位高人了