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

Gunther (sorry can't find the umlaut on my keyboard)

Thanks for your tips on faultfinding the UART VP. 

I did as you told me, stripped down the code to a bare minimum. Then I removed the inversion of the character to be sent to compensate for the inversion made by the MAX232. (I am sticking to setting the bit 7 of tx_low as I did not understand the reasoning for clearing the byte altogether.) 
I wrote a small main routine to set up the input parameters required for the transmit routine and tried it out. No luck.
I tried some alterations, like clearing tx_low altogether, checking the code for the umpteenth time but to no avail.

However, depending on what value I load into tx_high, I either get a character (not the correct one, but still) repeated at fast pace. 
Negating the value loaded into tx_high, (incorporating a not w after initial character definition) will only give me spurious characters (not the anticipated one) and only after a reset. 

I'm totally dumbfounded by this. 

Can I ask you to have a look at the program which is attached to this post? I would be ever so greatful.

Best regards
Frasse

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