I would like to build a 5-button remote (RF 868 Mhz) and was thinking of using the STM32G031F6
(The RF is provided using an external chip, similar to Si4455)
However the STM32G031F6 has only 4 x SYS_WAKEUP pins.
Is there anyway to wake up from standby using one of the other pins too, or do I need to consiuder a different STM32 product?
Basically I need to wakeup from standby, from any of the 5 buttons, send some SPI to the RF CHip, flash an LED and go back to standby.
Power will be from an CR2430 battery cell.
Additionally, if there is no need to distinguish the wake-up sources, one can implement an OR logic in hardware. Even a simple diodes can do it. If voltage levels ar not low/high enough to be reliable, just add a single transistor at the output of the OR logic.