Zitat Zitat von Ratber
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Nimm einfach Zwei Bausteine.
Ich bin verwirrt.
Was bedeutet dann das

Each of the PCF8574’s eight I/Os can be independently
used as an input or output. Input data is transferred from
the port to the microcontroller by the READ mode
(see Fig.11). Output data is transmitted to the port by the
WRITE mode (see Fig.10).
im Datenblatt ?

Gruss
Frank