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Initial pull-up state on LPC804

Question asked by Xaro Wubas on Jan 21, 2019
Latest reply on Jan 24, 2019 by ZhangJennie

The LPC804 datasheet (rev. 1.4, page 12) lists PIO0_10 and PIO0_11 as having a passive reset state whereas the remaining GPIO pins have the internal pull-ups enabled by default. The reference manual (UM11065, rev 1.3, page 103-104) lists the reset states of PIO0_10/PIO0_11 as also having the pull- ups enabled.


Measuring the pin immediately after the ROM start-up sequence or inspecting the IOCON configuration appears to confirm that the latter behavior.


Which document is correct? Are any GPIO I/O pins with a high-Z reset state available on the LPC804M101JHI33E?