How does Data Direction Register (DDR) pull up resistor circuit work in Atmega Micro controllers, configuring the registers to function as Output and Inputs depending on the DDR values 1 and 0 respectively? How is it working physically at the circuit level?
Manu Krishnan
DDRx itself says its data direction, we can 'tristate' make the corresponding pin as o/p with this register. For enabling and disabling the pull ups we should use the PORTx, after setting the corresponding DDRx register. If the DDRx bit is enabled, this will in turn turn on a mosfet attached to a resistor. This will "pull up " the corresponding pin.
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