In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Peter Van der Zee wrote:

Hi Guenther;

It's me again. Filally I seem to be exercizing your simulator quite a bit; it's very helpful for some of the strange things I'm doing.

I note that in the register window, the default value for the port bits (inputs at reset) is zero, but when they become configured with pull-ups should they change to a one?

It would be wonderful if both, the input values AND pending output values could be shown, so when an output register gets assigned a value by the program, and (some) of the bits are input, and then the program changes them to output (I do this a lot), then the pre-loaded ouput values get presented on the port bits which have now become outputs.

Also, there is an incorrect operation when right or left shifting a port register. Shifts (right or left) out of a bit which is configured as an input should have a value of one. You provide a value of zero, and non-adjacent outputs should NOT ripple through the port display window; but adjacent ones should. In other words, at any bit where a port register contains a bit configured as an input, then a (left or right) shiftout from that bit should be a one. That is for between adjacent bits as well as the end bits to the carry.

Cheers,

Peter (pjv)

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