could u advise what the value of internal pull up and pull down resistor value for lpc804 is? thanks!
The pull-up and pull-down are not passive resistors but active current sources (they typically deliver around 50µA when enabled) that is why there is not a precise value for them. Please refer to the "Ipu"/"Ipd" and "Vi" characteristics in the LPC804 data sheet (Electrical pin characteristics, located at the Table 14, page 48):
So for example, if a pin at pull-down has a typical Vi of 5V, the current would be of 50µA and therefore the internal resistor value would be of 100 KOhms.
I hope this information can help you, and please ask if you have any more doubts.
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