User's Manual

LE920A4 HW User Guide Hardware Interfaces
Doc#: 1VV0301261 General Purpose I/O
Rev. 4.3 Page 92 of 123 2017-12-07
8.7.2. Using a GPIO Pad as an Interrupt Source
GPIO pads, when used as inputs, can also be used as an interrupt source for the
software.
In general, all GPIO pads can also be used as interrupt sources. However, not all GPIOs
can be used as a wakeup source of the module (wakeup from sleep)
Only the following GPIOs can be used to wake up the system from sleep:
• GPIO1
• GPIO4
• GPIO5
8.7.3. Using a GPIO Pad as Output
GPIO pads, when used as outputs, can drive 1.8V CMOS digital devices or compatible
hardware. When set as outputs, the pads have a push-pull output, and therefore the pull-
up resistor can be omitted.
Figure 21: Output PAD Equivalent Circuit