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

Hello,

I think what Bean was saying about the resonator is that the OSC setting you've been using when running at 5v may need to be changed when running the chip at a lower voltage like 3.3v.  That should be a relatively easy thing to try and wouldn't take long to try all the different OSC combinations to see what one works best.

In regards to the way the port is working (or not), how have you set up the port?  Have you tried the different combinations (pull-ups, CMOS, TTL, Schmitt, etc) to see if any of those are a factor?

Just for testing purposes, can you set the brownout even lower or disable it?

How are you handling the RTCC pin?  Is it tied high/low or left floating?

How is your RESET line connected?

I've had really good luck using the SX chips for several projects and i'm sure you'll get it working.

Best Regards,

Robert

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