Thank you for your kind reply Dennis. As per my problem, yes start and stop conversion functions are called and executed but adc12 never hits the isr.I think my problem is that I have to hard wire timerb output to adc wtih this adc configuration.I tried a double channel repeated conversion.channel 0 for start and stop conversion and channel 1 for actual readings.I hardwired P7.4 (signal generated by timerb) to 6.0 for starting and stopping the conversions.It seems to work but there must be a way to manipulate the sequence with software only. Thanks, Tufan
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