The I 2 C, bus controlled push-pull general-purpose input/output feature PCA 9538/9539 I/O expanders, integrating push-pull outputs, interrupt, and hardware reset. The 4-, 8-, and 16-bit devices have ...

drives the gate's output to a low level and triggers the interrupt. The interrupt-service routine recognizes the interrupt's source by testing the levels of input pins PA0, PA1, PA4, and PA5 and ...