ADuC834: Values of the internal pull up resistor

Document created by analog-archivist Employee on Feb 23, 2016
Version 1Show Document
  • View in full screen mode

There is everywhere in the  manual that port's have pull-up's, but what are
the values of the pull-up's in ports 1, 2 and 3 ?


You can optimise the value of the pull ups depending on the speed and power
requirements. 10kOhms is a good start. The maximum value is determined by the
leakage current and the noise margin to the positive rail or the maximum
risetime required combined with the line capacitance.

10kOhm usually satisfies both of these requirements.