re uart needed really break detect in article tau ceti isc br com jimc tau ceti isc br com jim cathey wrote in article alan alan apple com alan mimms writes actually detecting a break is done by watching for a character containing all zero bits with the framing error resulting from its receipt this true enough but means that the line stayed in the zero bit state even past the stop bit time slot which basically indicates a break there is no special way to detect break that i have found other than this there s no magic signal generated by uarts etc zilog scc rr break detect this is a very popular part but it has a number of quirks especially in hdlc mode signetics duscc rsr break start detect rsr break end detect two of the bits in the receiver status register you can enable an interrupt on either of these bits going high too also only one null will be put in the fifo per break detected this is simply the best serial chip i ve ever worked with many less quirks than the scc which is imho second best death to devices and i thought i knew a lot about serial devices perhaps i should just keep my big mouth shut sorry alan mimms alan apple com apple alan my opinions are generally portable macintosh software group pretty worthless but apple computer they are my own art without engineering is dreaming engineering without art is calculating steven k roberts in computing across america
