In SX Microcontrollers, SX/B Compiler and SX-Key Tool, lmolter wrote:

Project:
PIR motion-controlled (trap, trail, ghost) camera. Night vision camera will take videos when motion is detected. This part works.

Problem:
Camera goes to sleep after 5 minutes of no activity.  I'd like to send a heartbeat (wakeup) pulse every minute to keep the camera awake. Since I haven't been programming the SX is a long while, and I never did really understand interrupts, I am at a loss on how to implement this. First thought is to use an external timer to generate constant 1 minute pulses. I could set on of the RB port pins to generate an interrupt on rising edge change. Second thought is to use RTCC somehow, but I don't really know how that works, either.

The external signal seems the simplest solution, even though it adds a component to my layout.  But... I don't know how to configure the INTERRUPT statement.  If I just code INTERRUPT without any other options, I get a compile error.

Any thoughts out there on trapping a long-period signal?  I'm just spinning in circles.

Larry

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