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Everything Else » Define PUOE

NerdKits » Forums » Everything Else » Define PUOE (2 posts)

June 13, 2011 by JoyceChee	can anyone explain what is Pull-Up Override Enabled (PUOE)?
June 13, 2011 by bretm	For general-purpose I/O pins, the pull-up state is controlled by the PORTxn bit when the pin is configured for input (DDRxn = 0), except that all pull-ups are disabled when bit PUD of MCUCR is set. PUOE turns on an internal override mechanism. Most pins have an alternate function, e.g. if you enable serial I/O it makes the TX and RX pins unusable as general-purpose I/O. The PUOE signal disables the normal pull-up logic and hands it over to PUOV, which is controlled by the alternate function of the pin. PUOE and PUOV are just internal circuitry, not registers that you can access.

June 13, 2011
by JoyceChee
JoyceChee's Avatar

can anyone explain what is Pull-Up Override Enabled (PUOE)?

June 13, 2011
by bretm

For general-purpose I/O pins, the pull-up state is controlled by the PORTxn bit when the pin is configured for input (DDRxn = 0), except that all pull-ups are disabled when bit PUD of MCUCR is set.

PUOE turns on an internal override mechanism. Most pins have an alternate function, e.g. if you enable serial I/O it makes the TX and RX pins unusable as general-purpose I/O. The PUOE signal disables the normal pull-up logic and hands it over to PUOV, which is controlled by the alternate function of the pin.

PUOE and PUOV are just internal circuitry, not registers that you can access.

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