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STM32F401 64pin pin1 marking / orientation

Question asked by bil.til on May 20, 2014
Latest reply on Sep 4, 2014 by waclawek.jan
I just want to place a STM32F401 64pin LQFP chip on my PCB, but to my surprise this chip has 2 pin 1 marking dots, on two diagonal corners. If I position the chip such, that I can read the text "ARM STM32F401...", then one dot is left bottom, and the other one is right top.

Anyone has an idea, which is the correct pin1 marking?