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  • atesss

    addikt

    válasz Aryes #13439 üzenetére

    Adatlap 11.oldala:
    Resetting and reactivating the interrupt circuit is achieved when data on the port is changed to the original setting or data is read from, or written to, the port that generated the interrupt. Resetting occurs in the read mode at the acknowledge bit after the rising edge of the SCL signal, or in the write mode at the acknowledge bit after the high-to-low transition of the SCL signal.
    ...
    This device does not have internal configuration or status registers. Instead, read or write to the device I/Os directly after sending the device address (see Figure 16 and Figure 17).
    By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate by way of the I 2C bus. Therefore, PCF8574 can remain a simple slave device.

    Úgy néz ki ez nem tud ilyet, nem tudom felülírni az INT regisztert, mert nincs olyan neki (vagy legalábbis ha van is valami belső, kívülről nem hozzáférhető).

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