IO扩展芯片PCF8574的中断引脚的理解

The PCF8574 device provides an open-drain output (INT) that can be connected to the interrupt input of a microcontroller. An interrupt is generated by any rising or falling edge of the port inputs in the input mode.

在输入模式的时候,如果有引脚的高低电平跳变,则会产生中断,可以接到MCU上

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