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

Ron,

to my experience, the RAM contents remains unchanged after a watchdog reset. This seems to be quite logical, as the RAM is static, and keeps its contents as long as it is powered. IOW, as long as power is appied to the SX w/o interruption, the RAM is fine. This also means that you should not rely on RAM contents in case of a brownout reset, as you can't tell how low the supply voltage has dropped.

I agree with you that there seems to be an error in the SX spec sheet concerning the port data. It is correct - and for safety reasons, it makes sense - that the TRIS registers all hold $FF after a reset to configure all port pins as inputs. Seems as if the port's output data registers are also initialized to $FF, although this is not logical. I'm currently populating another of my SX 28 MultiBoards for a new project. When I have it ready, I'll do some more tests on this issue, and let you know the results.

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