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

Gunther,

I found the problem of my stripped transmit routine! 
I forgot to set the return value before issuing the retiw in the interrupt routine. 
I also found out that it is necessarry to do a not w for the character value before loading it into tx_high and then in the interrupt routine send the inverted value by using movb    tx_pin, /tx_low.6 (as it said in the original program) despite me using an inverting RS-232 driver.

Anyway, this is it for tonight, I'll continue with the receiver routine tomorrow, now that I got something to work with.

Once again, thanks for your help!

Best regards
Frasse

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