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

Thanks Jim, your approach has two advantages over mine: you don't need an external oscillator and you get always whole cycles, however it takes too much processor time.

Eventually I have managed to put my design to work. The problem was the encoding of the signal, not the hardware. It happens that the signal is preceded by a burst that is badly specified on the documentation. I have had to open the printer and measure the actual signals received from an actual HP calculator. This way I discovered that my start signal was wrong. Now it works !

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