Does anybody have working example of driving PCF8574A for at89c2051? I'm trying to blink a LED almous about 6 hours with a zero result... :-( SDATA on P1_6, SCLK on P1_7 how to turn on/off LED on PCF A0 ? Thanks...
Thank's a lot for your help... My code was working too, my problem was: I'm not connected "earth" between microproc. and my i2c device (two separate power supply) :-)