Hello Ioannis,
good question,
when I design the PCB I used the PortB.5 with a 20Mhz crystal with bigger pcb foot print 46x17mm
then I decided to lower the parts count and the PCB foot print to a bare minimum (41 x 17mm)
Also theses HD44780 are still in use by many hobbyist around the world, I guess, and the baud rate I was looking is plenty for this kind of display.
thank's for asking.
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