Пример управления HD44780 с помощью ATtiny13A через сдвиговый регистр, с использованием двух линий порта.
Карта осциллограмм:
A: Аппаратный шим канала PB1
B: Latch 74HC595
C: RC-фильтр
D: Пакет данных поступающий в 74HC595
Подробней здесь:
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