I have a tiny embedded system build around a Holtek HT48F06 microcontroller to monitor RFID tags (RDM630). Unfortunately it only detects the arrival, not the removal of a tag. As a workaround, I want to reset the microcontroller periodically (say once per second), since that triggers a new attempt of detection (or does that seem like a bad idea?). Using a 555, I found some suitable values (22µF, 4+100kΩ) for a timer to trigger the reset.
However, in order to delay the power-on-reset, the low-active RESET-pin of the microcontroller is connected to a RC net like the following:
So my question is, what would be a good way to connect a timer to the reset pin, preferably without making any changes to the existing circuit (I am not to keen about fiddling with the tiny smd pcb).