If your ATU-100 board does not have a programming header, you will have to tack solder connections to traces from the following pins on the micro, to the labeled pins on the OLED?
?or equivalent SSD1306 128x64 OLED
U1 pin:? ?PROG? ? OLED:
?1? ? ? ? ? ?1 MCLR? not used
20 Vdd? ?2 +5V? ? ? Vcc
?8? Vss? ?3 GND? ? ?GND
28 RB7? 4 DAT? ? ? SDA (serial data)
27 RB6? 5 CLK? ? ? SCL (serial clock)
See the attached micro portion from the ATU-100 schematic.
?
N0YWB