Microcontroller › 8051 › pull up register doute › Ritesh,Pull up resistiors are
June 25, 2012 at 2:38 pm
#8121
Participant
Ritesh,
Pull up resistiors are necessary at the port because the port pins of the controller are open drain or open collector.
Pull up register are used toenable internal pull up resistors.which deliver a very less current of about 2mA to 8mA. It is recommended to use external pull ups based on the load at pins.