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By sztomi86
#4000 Staying at the RTC Clock issue:

Maybe ESP-12 has enough pins to use RTC clock?
viewtopic.php?f=13&t=605

I found a doc here: http://esp8266.ru/esp8266-pin-register-strapping/

Telling that GPIO1 or GPIO5 can be used as RTC_CLK?

What about the secondary function of XPD_DCDC as RTC_GPIO0??

By the way: There are RTC functions out with 0.9.3 SDK however it doesn't work for me (yet)..
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By jonsmirl
#4075 Espressif has stated on their BBS that the EXT_LF clock feature doesn't work. It was deleted from their Chinese datasheet but they missed the paragraph in the English one. It is now deleted in the current English version. So nothing is being hidden, it just didn't work right.