ESP8266 Community Forum

GPIO 16 is the only one with pull-down as far as documentation goes for PINs
All GPIOs from 0 to 15 have only pull-ups.
What you are trying to do will not work even if pull-down is available if I understood what you want. You have access to the register way after the boot mode is triggered, so your only option is to use a resistor.
Really sucky they used GPIO15 for that purpose because it kinda breaks the SPI Slave since GPIO15 is the SS pin.

ficeto wrote:GPIO 16 is the only one with pull-down as far as documentation goes for PINs
All GPIOs from 0 to 15 have only pull-ups.

Ah, ok. Where can I find this documentation you are referring to?

I really have no memory where I got it from but here is a zip with the files (on the next thread page)

Alas, I do neither have a Mac nor the Numbers Spreadsheet application...